Disturbed Zone Research Articles

Gas permeability evolution of granite under confining pressure unloading tests

Tunnel excavations in rock usually cause initial stress release, which is different from the stress path in classical triaxial compression tests. To analyze the permeability variations in excavation disturbed zone, two different stress paths, e.g. classical triaxial compression and confining pressure unloading, are applied on granite, and the permeability at different damage levels is measured using gas as transport medium. The differences in deformation and failure mechanism and their impacts on gas permeability variation are discussed. The test results show that lateral deformation of samples in confining pressure unloading tests is obviously larger than that in classical triaxial compression tests. Unlike the permeability decrease-increase transition in classical triaxial compression tests, the permeability in confining pressure unloading tests shows an overall progressively increase trend. The permeability in both tests increases significantly near failure and achieves the same order of magnitude. The differences in permeability evolutions under the two stress paths are directly attributed to their different deformation mechanisms. The test results could provide a new understanding of permeability properties during the underground excavation.

Investigation on the distribution characteristics of ground cracks in the Chengchao Iron Mine, China

In this study, a comprehensive assessment of the distribution characteristics of ground cracks in the Chengchao Iron Mine was conducted by field investigation and monitoring. In general, ground cracks are initially distributed around collapse pits, and subsequently extend outwards centered on the mined-out area. Greater ground deformation leads to more developed ground cracks. Ground cracks can be divided into cut-through crack, deep crack and shallow crack based on their downward extension depths. Furthermore, the formation of ground cracks is controlled by both underground mining and geological structures. Ground cracks can be divided into mining-induced crack and tectonic crack based on their main influencing factors. Moreover, many types of ground cracks are caused by different failure modes including tensile failure, shear failure and mixed failure. Ground cracks can be divided into vertical-shear crack, vertical-shear and horizontal-tensile crack, horizontal-tensile crack, horizontal-shear crack and mixed crack based on their formation mechanisms. In particular, the movement line and the break line, defined as e = 2 mm/m and 6 mm/m, respectively, can be reasonably regarded as disturbance boundary and crack boundary in a metal mine. The disturbance zone caused by underground mining can be divided into collapse zone, break zone and movement zone based on the size of ground deformation and the characteristics of ground cracks. Increases in ground crack width and length exert different degrees of stress release on the rock masses outside and inside the crack, thus increasing their deformation difference. In addition, the extension of ground cracks is related to the ground topography and the strength and integrity of the rock masses and soil. Cracks on hilltop are more developed than those on flat land, and cracks will initially appear in rock mass and soil rather than on a concrete structure due to the lower strain resistance of the rock mass and soil. However, concrete structures are more sensitive to cracking than rock mass and soil because of the better integrity of concrete structures.

Zredukowane współrzędne obrysu strumienia na trapezowym progu przepuszczalnym z przelewem o ostrej krawędzi na skarpie górnej

The purpose of the work was to develop a typical shape of water surface profi le above trapezoidal gabion sill with the sharpcrested weir on the upstream slope. Reduced co-ordinates of the water surface profile above trapezoidal gabion sill with a sharp-crested weir on the upstream slope were developed. The ordinate points of the contour were reduced in relation to the height of the upstream water level above the sharp-crested weir. The cut off points of the contour were reduced according to the length of the zone influencing the stream to the inside of the stone sill. In the analyzes, the results of laboratory tests were used, according to which the shape of the free surface profile reduced coordinates was developed. The analyzed sill consisted of the permeable part filled natural aggregates and the solid part in the form of an inclined sharp-crested weir. The sill had a symetrical trapezoidal shape with the slopes of 1 : 1. The shape of the stream flowing over the analyzed sill depends on the head of the upstream water level above the crest of the slope weir. As a result of the conducted analyzes, a uniform stream shape was obtained for both the free and wave flow of the disturbance zone. The profiles obtained have strong correlation dependence. The obtained results can be taken into account during design similar hydraulic structures.

The landscape profile method as a new tool for sustainable urban planning

Work on landscape diversification resulting from the European Landscape Convention obliges European countries to identify and assess the state of their landscapes. The aim of this article is to test a new method of landscape profiling, enabling measurement of the extent of anthropogenic transformation of a landscape and indication of zones of landscape disturbance. The method is based on an interdisciplinary analysis of various aspects of the landscape, consisting of an assessment of the degree of overlap between natural and non-natural boundaries. Three types of relationships were identified: landscape convergence (LC), landscape divergence (LD), and zone of landscape disturbance (ZLD). This analysis makes it easier for urban planners to change their existing land development plans. The method can be used universally to detect inappropriate land development, which is important in diagnosing the condition of landscapes and can be used in the spatial planning of cities and suburban zones.

The spatial distribution of noise barriers in Montreal: A barrier to achieve environmental equity

Road traffic noise constitutes a major problem for the health of populations exposed to it over extended periods. From a perspective of environmental equity, we focus on the distribution of four segments of the population—children, seniors, low-income individuals and visible minorities—in noise disturbance zones near major traffic routes of the Montreal Metropolitan Community. First, some corridors along these traffic routes with different levels of noise disturbance are defined according to a number of parameters; subsequently, the overrepresentation of the groups studied is assessed with the help of two indices. Next, we attempt to determine whether these groups have access to noise barriers, abatement measures to mitigate the noise. To assess the overrepresentation of the four groups under examination in protected and unprotected noise disturbance zones, multinomial logistic regression models were constructed for the entire territory, and then for six subregions. The results reveal a situation doubly inequitable for low-income persons and, to a lesser extent, for visible minorities. Indeed, these groups more often live close to major traffic routes and are less likely to be protected by noise barriers. In contrast, children are doubly advantaged.

The level participation in efforts mount Kelud eruption disaster mitigation in East Java

Indonesia location is between four plates, there are: Eurasian, Indo-Australian, Philiphines, dan Pasicic. Subduction between plates make Indonesia disturbed a natural incident such as mountain eruption. One of disturbed mountain eruption disaster area is District Ngancar, Kediri Regency. This case because Ngancar location near Kelud slope. People participation for efforts mitigations is very important for reduced natural incident impact. The aim this paper to discuss form and level people participation in District Ngancar for efforts Kelud mountain eruption disaster mitigation. This research is survey with sample 100 from 5.340 head family. The data collected with interview and documentation, then analized by quantitative description with scoring and percentage. The research result showing that people in disaster disturbed zone I, II, and III get participation score each the amount of 1.425, 935, and 1.133. The participation action, include: elucidation disaster, organizing disaster preparedness, preparing self, making early warning system, and saving property.

An analytical solution for consolidation of PVD-installed deposit considering nonlinear distribution of hydraulic conductivity and compressibility

PurposeIt is well known that the prefabricated vertical drain (PVD) installation process generates a significant soil disturbance around PVD. This disturbed zone significantly affects the rate of settlement and excess pore pressure dissipation. However, the characteristics of these zones were still uncertain and difficult to quantify; there remains large discrepancy among researchers. This study aims to develop a simple analytical solution for radial consolidation analysis of PVD-installed deposit considering mandrel-induced disturbance.Design/methodology/approachThe proposed solution takes into account the nonlinear distributions of both horizontal hydraulic conductivity and compressibility toward the drain. The proposed solution was applied to analyze field behavior of test embankment in New South Wales, Australia.FindingsBoth effects significantly increased the time required to achieve a certain degree of consolidation. The effect of hydraulic conductivity on the consolidation rate was more significant than the effect of compressibility variation. And, the increased compressibility in the soil-disturbed zone due to mandrel installation significantly increased vertical strain of the PVD-improved soil deposit. The predicted results using the proposed analytical solution were in good agreement with the field measurements.Practical implicationsA geotechnical engineer could use the proposed analytical solution to predict consolidation behavior of drainage-installed ground.Originality/valueConsolidation behavior of PVD-installed ground could be reasonably predicted by using the proposed solution with considering variations of both hydraulic conductivity and compressibility due to PVD installation.

Gas transport modelling at different spatial scales of a geological repository in clay host rock

The work presented in this article is a part of the international European Commission FORGE project which studied the behaviour of repository gases in the context of radioactive waste disposal. Experimental work is essential to understand the main transport mechanisms for gas and to determine the main geophysical parameters. However, while laboratory and rock experiments can help to investigate the short- and partly the middle-term behaviour of gas in a rock formation, long-term predictions have to be based on numerical simulations. Numerical simulation of long-term gas behaviour in a deep geological repository was one of the aims in the FORGE project. The objectives of the FORGE modelling were to describe the state-of-the-art consideration of gas in performance assessment, and to propose an updated treatment of gas issues in long-term safety assessments for high-level radioactive waste and spent nuclear fuel. Three benchmark exercises for a hypothetical geological repository in clay host rock ranging in scale from a single disposal cell to the whole repository were defined. To provide added value to this benchmark, a feature not yet well represented in typical gas simulations was introduced: the explicit representation of the interfaces between the excavation disturbed zone and the engineered elements within the excavation, such as waste canisters, bentonite plugs, and access drifts. In order to assess gas transport behaviour at the whole repository scale, models were developed with ‘mathematical’ or ‘numerical’ upscaling techniques for small-scale features. The assessment across different modelling scales revealed the main long-term gas migration pathways and led to the conclusion that the explicit representation of interfaces is not important.

Habitat selection response of the freshwater shrimp Atyaephyra desmarestii experimentally exposed to heterogeneous copper contamination scenarios

In contaminated aquatic ecosystems, it is expected that organisms suffer some effects caused by the contaminants. However, for mobile organisms inhabiting heterogeneously contaminated ecosystems, the continuous exposure to contaminants can be avoided by moving to less contaminated habitats. The present study evaluated the habitat selection of the freshwater shrimp Atyaephyra desmarestii experimentally exposed to different copper concentrations to verify whether the heterogeneous contamination distribution and the connectivity between habitats with different copper levels could generate a random population distribution similar to metapopulation. The experiments were performed in the HeMHAS (Heterogeneous Multi-Habitat Assay System), a non-forced multi-compartmented exposure system, in which it is possible to simulate the distribution of contaminants in a linear gradient or as patches of contamination. Copper was used to simulate a linear contamination gradient (26 to 105 μg/L Cu) and two patchy scenarios with three contamination levels [reference zone (R: 26 ± 7 μg/L Cu), mixing zone (M: 61 ± 2 μg/L Cu) and disturbed zone (D: 101 ± 12 μg/L Cu)], with two mixing zones or one central mixing zone in a heterogeneous scenario. In the copper gradient scenario, a clear trend of shrimps (59.6 ± 8.0% of the population) moving to the reference zones and an avoidance of 66.7 ± 11.1% of the most contaminated zone were observed. For the patchy scenarios, a random distribution of organisms (34, 36 and 30% for R, M and D zones, respectively) was observed in the scenario with one mixing zone; on the other hand, a slight preference for the reference zones (44.9 ± 4.8%) was evidenced in the scenario with two mixing zones. As shrimps are able to select less contaminated areas, it is highly important to preserve clean zones in heterogeneously contaminated environments, such as the arrangement in meta-ecosystems, as the less- or uncontaminated zones might represent less stressful areas to protect populations against continuous contamination exposure.

Effects of wind farm on surface soil in desert steppe, China

In recent years, the wind farm has developed rapidly in northern China. However, the construction and operation of wind farm directly or indirectly result in the change of soil structure, thus affecting the regional ecological environment. According to the characteristics of wind turbine engineering, the disturbance area of wind farm can be divided into the core disturbed zone, the secondary disturbed zone and the indirect disturbed zone. A field study was conducted to investigate the physical and chemical properties of surface soil in different disturbed zones. The results show that: (1) soil compaction, soil bulk density and soil salinity of the surface soil are sensitive to wind farm disturbance; compared with the undisturbed zone, there are still significant differences between the core disturbed zone and the secondary disturbed zone; (2) after nearly 10 years of natural recovery, apart from the phosphorus element, there are little differences of surface soil nutrients in different disturbed zones; (3) the impact of wind farm on surface soil will be gradually eliminated over time, but continuous and frequent disturbances caused by engineering maintenance during its operation should be avoided if possible.

Theoretical Analysis and Numerical Simulation of Multi-Fields Coupled Variation During Deepwater Hydrate-Bearing Reservoir Exploitation

Natural gas hydrate is regarded as a kind of potential alternative energy resource and attracts the attention all over the world. Geological surveys have found that most natural gas hydrates are buried at the bottom of the sea. Several development methods, such as depressurization, thermal stimulation and inhibitor injection are proposed gradually on the basis of hydrate special properties, obtaining certain trial-produce performance. It is of great significance to learn the flow rules underground for production safety guarantee and efficiency improvement. However, the special phase transition of hydrate between solid and fluid accompanied by energy and mass change makes it difficult to predict and describe the parameters variations during hydrate-bearing exploitation. Since the hydrate is always sensitive to surrounding conditions, the disturbance of ambient pressure and temperature can change the corresponding phase equilibrium temperature, pressure and even phase transition rate. On the one hand, hydrate dissociation/reformation is an endothermic/exothermic reaction and releases/consumes large amount of gas in the limited space, reacting on the ambient pressure and temperature. On the other hand, hydrate phase transition also induces particles (hydrate, ice, sand, etc.) separation, aggregation and migration, altering the original hydrate saturation, reservoir properties (thermal conductance, permeability, skeleton structure, bonding strength, etc.) and multiphase flow. Then the heat and mass transfer in porous medium driven by the pressure difference and temperature difference influences the ambient conditions. Therefore, it is a complex coupled process with a series of variables. In this research, interaction mechanism between hydrate phase transition and porous media properties has been analyzed through influencing factors and the coupled relationship between multi-fields (containing temperature field, pressure field and seepage field) has been obtained. Taking the deepwater characters into consideration, the wellbore temperature and pressure distribution has been predicted by numerical simulation firstly as the boundary conditions of neighborhood hydrate-bearing reservoir. After proposing assumptions for simplification, the multi-flow model in hydrate- bearing reservoir has been built. Then applying production data referred from existed literatures and field reports, the multi-fields coupled variations during exploitation of hydrate-bearing reservoir have been simulated by the multi-flow model. The results indicated that although the temperature gradient of sea water reduce the wellbore temperature and the pressure gradient increase the wellbore pressure gradually, the ambient conditions are still disturbed significantly and become closer to hydrate phase transition requirements (10~30 MPa, 10~60℃). The near- wellbore temperature increases and pressure decreases earliest, and the variation area spreads towards the further reservoir. As time goes on, the disturbed zone becomes larger and larger but spread rate becomes lower and lower. Combining the reservoir temperature and pressure distributions with the hydrate phase equilibrium, corresponding hydrate phase transition can be analyzed and natural gas production can be estimated, providing a certain theory support for deepwater hydrate-bearing reservoir multi-fields prediction and efficient production.

Disturbance effect analysis of pipe jacking construction based on failure approach index

In order to evaluate the influence of pipe jacking construction process on ground subsidence and surrounding buildings, the numerical simulation of the construction process was carried out by FLAC3D, and the failure approach index (FAI) of the rock and soil around the pipeline was calculated to describe quantitatively their risk and damage state. The numerical results show that the final settlements of the buildings around the pipeline are less than the buildings' safety control values. The rock or soil mass within 0.8 times of the pipe diameter are in the excavation damage zone and disturbance zone (0.8≤FAI≤1.3), while outside 0.8 times of the pipe diameter are basically undisturbed (FAI≤0.8).

Heat‐Generating Nuclear Waste in Salt: Field Testing and Simulation

Core Ideas A field‐scale experiment and numerical simulations confirm salt backfill behavior. Simulations closely match temperature around and under the piled salt backfill. Results indicate limited dissolution–precipitation reactions around the heat source. Alteration of backfill is unlikely if the drift is allowed to dry before emplacement. Investigations relating to in‐drift disposal of heat‐generating nuclear waste in salt have raised questions about heat–brine interactions in the unsaturated run‐of‐mine (RoM) salt pile used as backfill. These interactions have the potential to change the structure of the RoM salt surrounding the canister, possibly altering long‐term containment of the source. An experiment is in progress at the Waste Isolation Pilot Plant (WIPP), New Mexico, in which a heated canister was placed on the floor of an open drift, covered in a pile of RoM salt, and energized with 1000 W. Temperature in the RoM salt pile had stabilized after about 15 d, allowing evaluation of the heat‐up period of the ongoing experiment. Using a multiphase porous flow simulator that has been modified to handle salt‐specific coupled processes, we examined coupled thermal–hydrological–chemical behavior in the RoM salt pile. Our simulations suggest that for the relatively dry cases examined, porosity changes within RoM salt in a generic salt repository are likely to be minor in the period between waste emplacement and plastic closure of the drift. The primary sensitivity for porosity change is to the early moisture content of the RoM salt used to cover the canister. Secondary influences include moisture availability from the disturbed rock zone (DRZ) surrounding the drift and the capillary pressure ratio between the DRZ and the RoM salt. Early changes in porosity and permeability may be affected by moisture content, but this was not observed in the test. Such changes would be most likely to occur when using damp RoM salt or if waste is emplaced in a drift immediately following opening of the drift before evaporative dewatering of the drift walls occurs.

METHODOLOGY FOR ACCOUNTING THE INFLUENCE OF METEOROLOGICAL FACTORS ON THE EFFICIENCY OF APPLICATION OF UNMANNED AERIAL VEHICLES ON THE BASIS OF SYSTEM ANALYSIS

ObjectivesThe aim of the study is to increase the effectiveness of unmanned aerial vehicles (UAVs) in the context of destabilising meteorological factors on the basis of an identification of links and patterns of unmanned aerial vehicles operating in difficult weather conditions.MethodsIn this work, in order to account for the effect of meteorological factors on the effectiveness of unmanned aerial vehicles, the methods of system analysis, mathematical modelling of atmospheric phenomena and processes, as well as probability theory and statistical assessment, were applied.ResultAn analysis of open literature sources devoted to the issues of operation and practical application of unmanned aerial vehicles (UAVs) under the influence of environmental factors was carried out. A classification of destabilising influences (DI) affecting the performance of a UAV flight mission is developed and presented. The dynamic probabilistic indicator, which, in characterising the dynamics of UAV functions as a complex technical system is referred to as “time efficiency of the UAV flight mission”, is substantiated. A methodology for estimating the dynamic efficiency indicator of the UAV’s functionality during the performance of a flight mission (FM) underDI conditions is developed on the basisof a probabilistic model of the conflicting interaction between UAV and DI. Strategies for selecting the trajectories of flights around local zones in which UAVs can be influenced by DI are given. To estimate the DI intensity and determine the size of the local disturbance zone, a mathematical model is proposed, whose application makes it possible to improve the UAV functioning under complex meteorological conditions (CMC) by taking into account the information on the space-time variability of dangerous for UAV weather-related phenomena (DWP). In the process of constructing the UAV functioning model, the use of conflict theory methods permitted adequate models for the analysis and evaluation of the dynamic efficiency indicator of the UAV functioning during the performance of FM in DI conditions to be developed, as well as the patterns of meteorological factors influencing the effectiveness of the UAV application to be revealed.ConclusionThe methodology proposed in the article makes it possible to increase the effectiveness of unmanned aerial vehicles (UAVs) under complex meteorological conditions by a time index of 20-30% as compared with traditional approaches.

FIGHTNING SUBLIMATION AND CRYSTALLIZATION OF COAL MATTER

The processes of sublimation and crystallization of coal matter in underground conditions are considered and described. One of the solutions to the problem of the occurrence of large volumes of gas in emissions in coal mines was proposed. It is shown that the quasicrystals of coal, described in the middle of the 1980s by the author of the article, can have an increased specific surface area. The sizes of quasicrystals reach microns and nanometers. They are the link between the crystalline and amorphous forms of matter. Gas-dynamic and thermal phenomena, in the presence of disturbed zones with a sufficient number of quasicrystals with a large specific surface area, can lead to the process of sublimation of coal. Gas-dynamic phenomena at shallow depths with considerable humidity and methane content can lead to the process of crystallization and the formation of gas hydrates. Sublimation has an exothermic effect and is realized with an increase in entropy. Crystallization has an endothermic effect and is realized with decreasing entropy. A real proof of sublimation can be considered as the resonance release of different gases in the process of burning of coals. The absence of resonant emission of gases indicates a transition of combustion to the process of decay. Cold and hot emissions are a consequence of the implementation of sublimation and crystallization processes. Cold emission is characterized by the presence of frost on the emission cone. The hot release has an exogenous character and is characterized by an elevated temperature. An example is given of the spontaneous formation of gas hydrates in the case of a fault in the soil of mining. The possibility of isolating disturbed zones and gas accumulations is the basis for controlling gas-dynamic processes.

Design and interpretation of packer permeability tests for geotechnical purposes

Packer permeability tests are used routinely in geotechnical investigations to allow estimation of hydraulic conductivity by analysis of pressure/flow rate response during controlled injection of water into a section of borehole, isolated by packers. This paper is a review of the hydraulic fundamentals of the packer permeability test methods and analyses used routinely in geotechnical investigations and discusses the usefulness and limitations of the test. Guidance is given on design of tests, including the maximum hydraulic conductivity that can be measured by the method. Interpretation of tests must recognize that responses are influenced by the entire test system – the host rock, the borehole and any associated zone of disturbance, water quality (injected water and water in the host rock), the packers or isolation system and the head/flow rate measurement system. It is proposed that, for geotechnical projects, presenting test results as a Q–H diagram (plotting injection flow rate v. applied excess head) is useful and allows results to be classified against seven conventional and three unconventional test responses. Guidance is given on the selection of values of hydraulic conductivity, for geotechnical design purposes, from various types of test responses.

Mineralogy and deformation structures in components of clastic sediments from the Morasko meteorite lake (Poland)

Abstract The paper presents a mineralogical analysis of sediments of the biggest lake in the Morasko Meteorite Reserve (Poland). The lake is filled by phytogenic sediments at the top, while at the bottom there are Neogene clays. The main components are: clay minerals in fine fraction and quartz and feldspars in coarse sandy fractions. The presence of disturbed ferrous zones suggests the existence of a dynamic factor that caused deformations in the sediments. Cavities, crevices, cracks, and traces of parching or fragmentation of mineral material can be interpreted as deformations related to the impact of meteorite fragments in non-consolidated soft sediments in the Morasko meteorite nature reserve. Meteorite fragments that left numerous deformed structures were most probably consituted meteorite debris that originated from the fragmentation of the meteorite before its impact.

Complex Analysis of the Polar Substorm Based on Magnetic, Optical, and Radar Observations near Spitsbergen

A comprehensive analysis of the polar substorm registered by IMAGE network stations close to the poleward boundary of the auroral oval has been carried out with THEMIS, CLUSTER, and GEOTAIL satellites in favorable positions for analysis. The observation interval is characterized by a low level of geomagnetic activity. The polar substorm looked like three negative, bay-like disturbances and developed within an ordinary substorm registered at stations in the middle of the auroral zone half an hour before the polar substorm. Each bay-like disturbance of the polar substorm was accompanied by a poleward drift of aurora and westward electrojet, a Pi2 pulsation group, a surge of magnetic activity over the range of 0.1–10 Hz, and enhancement of electronic precipitations over Spitsbergen. The differences between the first activation and two subsequent ones in the aurora dynamics, ionospheric convection, and electronic precipitations are revealed. The disturbed zone longitudinal sizes and position in the magnetosphere are estimated. Possible causes of the substorm onset and disturbances associated with it are discussed. The results of the study expand the statistics on the polar substorm phenomenon and will enable insight into its nature.

Simulation of wellbore construction in offshore unconsolidated methane hydrate-bearing formation

The unconsolidated nature of offshore methane hydrate-bearing formation poses challenges to sustainable methane gas production as the weak formation is susceptible to disturbance during wellbore construction. This could contribute to loss of well integrity which could manifest as sand production and error in the interpretation of downhole tests such as mini-frac tests. In this study, a simulation methodology of wellbore construction process is proposed. A finite element model adopting this methodology is developed in order to assess the effect of wellbore construction process on the integrity of the unconsolidated methane hydrate-bearing formation in the Nankai Trough, Japan. The main objectives are (i) to develop a modelling methodology of well construction process for numerical simulations, (ii) to assess the zone and magnitude of well construction-induced stress/strain disturbance in the formation and (iii) to evaluate relative impact of each well construction stage on the integrity of the formation. The results from this study show that the zone of horizontal stress disturbance from the geostatic state due to wellbore construction could extend to more than three times the radius of the wellbore. Following the wellbore construction, the deviator stress is concentrated in the hydrate reservoir sublayers with high hydrate saturation while plastic deviatoric strain has accumulated in the sublayers with low hydrate saturation. The results also show that modelling of cement shrinkage process is crucial in predicting the concentration of deviator stress in the high hydrate saturation layers.

Response of Macrobenthic Invertebrate to Organic Carbon and Particle Size in Lagos Lagoon, Nigeria

Macrobenthic fauna communities are important constituents of soft bottom marine ecosystems which inhabit the bottom environments playing a key factor in controlling structure and functioning of the aquatic environment. Lagos lagoon is the most exposed lagoon to anthropogenic influence in Nigeria coastal lagoon system. Bimonthly sampling was carried out in the Lagos lagoon from September 2014 - July 2016 for water and sediment in twenty – four stations to examine response condition of benthic communities to measures of water quality and sediment quality in Lagos lagoon in order to understand the benthic condition of the aquatic environment. A range of 9 – 91% for sand, 7 – 25% for silt, 0 – 73% for clay while a range of 0 – 4.77 was observed for TOC. The Diversity (H,) richness (d) and evenness (j) were positively correlated with the silt sediment particle size and. Kruskal-Wallis test showed that there was significant difference (p<0.05) between species richness and diversity at all sampling stations. Analysis of variance (ANOVA) showed no significant difference (p>0.05) in mean percentage particle sizes and TOC recorded at the stations but was significant (p<0.05) between TOC and macrobenthic invertebrates. The overall low diversity of macrobenthic fauna observed was attributed to anthropogenic activities majorly industrial dredging and local sand mining which altered the sediment characteristics of the aquatic ecosystem. Assessments of human induced stressors in the lagoon provided information useful for strict regulations and environmental policies to help prevent the aquatic environment from continuous deterioration hence, causing more loss of biodiversity. Responses of macrobenthic invertebrates to measured variables showed that there are high abundance and diversity of ecological groups of sensitive species majorly distributed around the slightly disturbed zones of the study area. In summary, variables examined in this study showed that the total organic content does not have a depleting effect on the abundance of macrobenthic invertebrates because the values are within permissible limits but the particle size characteristics present in this study showed good environmental indicator for evaluating macrobenthic invertebrate responses to stress pattern in water bodies along the coastal areas surrounded by various human activities.