Slope Excavation Research Articles

Excavation Slopes Stability Analysis with Cracked Soil in the Construction of the Serang – Panimbang Toll Road (STA 54+625) Under Maximum Rainfall Condition

Excavation Slopes Stability Analysis with Cracked Soil in the Construction of the Serang – Panimbang Toll Road (STA 54+625) Under Maximum Rainfall Condition

Application of a Hot Melt Recoverable Anchor Cable in Foundation Pit Support

With the continuous development of the social economy, the depth of foundation pit excavation of proposed construction projects in various places gradually increases, which is closer to the building red line, and the surrounding environment is relatively complex; therefore, there are few supporting schemes for foundation pit selection. Based on the Vanke B-6 plot of a real estate development project, the project has close neighboring buildings. If we use a normal anchor cable, underground cut line problems are possible, and so we choose the hot melt-type recoverable anchor; with three element dispersion pressure, the anchor cable can minimize broken sections of brush slope excavation and has advantages of a simplified construction process and good seismic performance. Except for the cable barrel, the other parts and all steel strands can be recycled, and recycled parts can be reused. The recyclable bolt (cable) overcomes the disadvantages of the conventional bolt (cable) as a temporary support, such as pollution of the underground environment, encroachment on the underground space of adjacent buildings, and becoming an underground obstacle in follow-up projects. It accords with the characteristics of the times of environmental protection and sustainable development, and has achieved good economic and social benefits.

Spatiotemporal evolution of deformation and LSTM prediction model over the slope of the deep excavation section at the head of the South-North Water Transfer Middle Route Canal

Slope deformation is one of the focal issues of concern during the normal operation and maintenance of the South-North Water Transfer Middle Route Project. To study the slope deformation evolution in the deep excavation section at the head of the canal, we applied 88 views of Sentinel-1A ascending image data from 2017 to 2019 and MT-InSAR(Multi-temporal InSAR) deformation monitoring technology to obtain long-time series deformation rates and cumulative deformation fields over the slope in the study area. Based on the analysis of the time-series monitoring data of the deformation field sample points, a LSTM (Long Short Term Memory Network) slope deformation predictive model was constructed to predict the slope deformation for the next 12 months at 12 sample points of the deep excavation slope. The impact of rainfall on slope deformation was investigated, and the reliability of the LSTM model was verified by using the measured data. The results show that the average annual deformation rate of the slope ranges from 10mm/a to 25mm/a, the maximum cumulative deformation is about 60 mm, and the slope of the excavated section is generally in an uplifted state. The rainfall-induced repeated uplift or subsidence of the canal slopes together with the peak deformation was closely related to the amount of rainfall during the wet season, and the longer the duration of the wet season, the more obvious the crest. Among the12 sample sites, the minimum and maximum deformation predicted using the LSTM model were 51.7 mm and 73.9 mm respectively, with the lowest correlation coefficient of 0.994 and the highest of 0.999. The maximum and minimum values of RMSE (Root Mean Square Error) were 4.4 mm and 3.6 mm respectively, indicating reliable prediction results. The results of the study can provide reference for the prevention and control of geological hazards in the South-North Water Transfer Canal.

Bantuan Teknis Perencanaan Dinding Penahan Tanah Pada Warga di Area Rentan Longsor

West Bandung Regency is one of the areas that frequently experiences landslides and landslides. Residents of Cililin Village, which is part of it, have concerns that the slope due to open excavation close to residential houses will have the potential for landslides but do not yet understand how to plan appropriate slope reinforcement. This service activity aims to review the stability of the excavation slopes around residents' houses and then plan a retaining wall that meets safe and stable technical rules. A field survey was carried out to measure the slope geometry and observe the situation around the area. Then slope stability modeling is carried out with input of slope geometry and soil property data. From the analysis results, it was obtained that the slope safety factor value was 1,518, exceeding the minimum safety factor of 1.5, so it was considered quite safe. However, this value is considered low considering that Cililin District is at high risk of landslides. Therefore, additional reinforcement of the slopes was made with earth retaining walls made of rock material. Planning for retaining walls is made of 4 types of varying dimensions. The size of the retaining wall varies, from a width of 3-4.5 m, and a height of 5.5 – 7.5 meters according to the height of each trap. From the planned dimensions, the overall safety factor against overturning, shearing and soil bearing capacity exceeds 1.5, the slope is declared safe. It is hoped that this service activity can become a reference for residents in making retaining walls to strengthen structures on similar slopes.

Study on the influence of slope shape with numerical calculation models on slope safety during slope excavation.

Under the influence of natural weathering and excavation in human engineering, slopes in nature have various slope shapes. In human engineering activities, the stability of different types of slopes formed by manual excavation must be affected by multiple factors such as geologic setting, lithology and environment. Therefore, to understand the impact of slope shape, geologic setting, and other conditions on slope stability of artificial slopes, calculation models for straight slope, concave slope, and convex slope are constructed based on the three slope shape characteristics. By changing the angles of upward and downward slope angles and analysing the parameters of slope shape, joint spacing, and joint angle, discrete element software is used to calculate the slope safety factor. The calculation results show that the slope shape, joint spacing, and joint inclination affect the safety of slopes. In straight slopes with large joint spacing, the smaller the slope angle, the greater the safety factor. However, in the interval of small joint spacing, the safety coefficient of slopes with slight joint inclination has the opposite variation characteristics. When a<90°, the straight slope has a dominant joint inclination angle that minimises the slope safety factor. In concave slopes, the more concave the slope shape is, the smaller the safety factor is; For concave slopes with small joint spacing, the slope with slight joint inclination has a more significant safety factor; Under the condition of large joint spacing, there is a dominant joint inclination in the joint inclination range of 30° to 70° for concave slopes, which minimises the safety factor of the slope. In convex slopes, the smaller the joint inclination angle of the slope, the smaller the safety factor of the slope, and the smaller the upslope angle of the slope, the greater the safety factor of the slope.

Crack propagation mechanism in bedded rock with parallel flaws: Insights from moment tensor inversion

Studying defects’ effect on bedded rock mechanical properties and failure mechanisms is essential for slope and underground excavation engineering. Acoustic emission helps analyze microcrack generation in rocks, shedding light on quasi-brittle material failure. However, previous studies have shown that the inhomogeneous geometry of defect-containing specimens complicates the localization of acoustic emission events, and some events may go undetected by sensors. This study uses discrete element modeling to examine bedded rock failure with parallel defects. We differentiate damage between acoustic emission events and macro fractures by assessing forces on failure sources. Our findings are as follows: (1) Bedding influences crack propagation direction but has limited impact on final failure. Cracks merging and penetrating in the bridge area are critical for catastrophic failure of samples. (2) Shear failure accumulates at the bridge area and defect tip, resulting in fragmented macroscopic failure. Tensile failure occurs during nucleation region development, leading to a more regular macroscopic failure. (3) High-magnitude events primarily arise from microcrack merging and connections, while crack propagation struggles to generate high-magnitude events. Most acoustic emission events involve 1∼4 microcracks, regardless of bedding angles or defects. The acoustic emission simulation method based on moment tensor inversion presents a novel approach for quantitatively determining the crack propagation law and failure mechanism of rocks with defects.

Study on slope stability under excavation and water storage based on physical model tests

Understanding the characteristics and mechanism of slope deformation caused by slope excavation and water storage is very important in the stability analysis of slope engineering. Therefore, based on similarity theory, a physical model test of excavation and water storage was established, and the deformation characteristics of the slope (three-stage excavation and five-stage water storage) were studied by using the monitoring technology of multiple measuring devices. The variation characteristics of the displacement, stress and pore water pressure in the slope were revealed. The results show that the contents of cement and yellow sand can regulate the physical, mechanical and hydrological properties and that gypsum and hydraulic oil have an effect on the permeability. Excavation leads to deformation of the rock mass in the middle and lower slope to the outside of the slope. This is attributed to the stress release, and local stress concentration occurs at the foot of the slope after redistribution. Moreover, the rock mass located in the fault zone shows nonglobal movement because the hanging wall rock mass will produce relative dislocation along the fault zone under self-gravity. Under water storage, the slope body is affected by the hydrostatic pressure, and transient compaction deformation occurs first. As water permeates into the slope body, the water weakens the rock mass, resulting in the gradual deformation of the rock mass near the slope surface to the outside of the slope. The above model test results can provide a valuable reference for slopes stability analysis in construction and subsequent operation.

Geotechnical and Geophysical Investigations of Estimating Rock Mass Properties

Accurate assessments of the deformation and strength properties of rock masses are essential for analysing the foundations, subsurface excavation, and construction of slopes, however, identifying geotechnical properties, particularly weak rock masses, is challenging for geoscientists, geologists, and geotechnical investigators. To determine the rock mass properties, geophysical techniques, and rock mass classification methods are widely used. Although rock classification methodologies exist, they are rarely employed in foundation construction analysis due to being predominantly established for tunnelling purposes. This study aims to employ classification methods, and geophysical and geotechnical investigation approaches to provide realistic rock mass properties for a building foundation, compare results, and assess techniques' effectiveness; it also reviews current state-of-the-art methods for classification techniques and investigations. Results show that compressional and shear wave velocities increase with depth indicating a change from poor to satisfactory mechanical behaviour, and empirical equations provide highly valuable and satisfactory deformation modulus values when compared to field seismic values. Almost all classification methods provided reasonable results compared with the seismic results, however highly overestimated and underestimated outcomes were obtained from some empirical equations applying the Rock Quality Designation index and Rock Mass Rating system. Empirical equations that gave the practical deformation modulus outcomes are the Rock Mass Rating based equations and Q-based equations and Geological Strength Index-based equations. Overall, the Rock Quality Designation index underestimated the seismic result, whereas the Rock Mass Rating, Q, and Geological Strength Index systems produced good agreement and realistic results. To conclude, classification methods were effectively applied to a building foundation. Since the Rock Quality Designation is a key value and feature for other systems including Q, and Rock Mass Rating systems, it is an essential factor. Although the Q systems provided practical consequences, this system mainly relied on the Rock Quality Designation value not the compressive strength of the intact rock. The Rock Mass Rating and being the most feasible and essential systems due to detailed geotechnical observations as inputs more significantly the uniaxial compressive strength of the intact rock, and various factors including deformation modulus, strength, Poisson’s ratio, equivalent cohesion, and friction angle of rock mass as outcomes.

Study on the micro mechanism of damage caused by unloading confining pressure of silty mudstone

The excavation and unloading of silty mudstone slopes often precipitate slope instability and collapse. While abundant research addresses the macro deterioration of rock strength, the micro-damage mechanism of silty mudstone remains largely uncharted. To bridge this gap, our study innovatively utilized nano-materials to prepare silt-like mudstone subjected to the triaxial unloading test considering multiple paths. Then we delved into the variation in microstructure using Scanning Electron Microscopy (SEM), binarization, and fractal dimensions. Our findings reveal that: (1) The peak stress, residual stress, and residual strain of silt-like mudstone display a decreasing trend with an increase in initial deviatoric stress while the peak strain initially increases and subsequently decreases; (2) Following unloading, the crack propagation on fracture surface is dictated by both confining pressure and initial deviatoric stress, which profoundly impact porosity, particle fragmentation, and pore expansion; (3) As confining pressure and initial deviatoric stress elevate, the average morphology coefficient rises with a reduction in rate of change. The impact of unloading confining pressure on pore morphology diminishes; (4) The fractal dimension increases with increased confining pressure and initial deviatoric stress, with a transition in the pore surface from smooth to rough.

Spatial Structures of the Initial/Early Upper Paleolithic at Tolbor-21, Northern Mongolia

This article describes the spatial structures of archaeological horizon 4 at Tolbor-21 in northern Mongolia, on the basis of data from 2015–2017. The presence of non-utilitarian items, faunal remains with traces of human impact, and the use of fi re render this site near outcrops of raw materials promising for the reconstruction of the spatial organization of Early Upper Paleolithic sites in northern Mongolia. Spatial analysis included visual observations and statistical procedures (clustering with two algorithms) aimed at identifying patterns in the distribution of fi nds in various areas. The infl uence of natural processes on the distribution of artifacts was evaluated with fabric analysis based on the positions of the long axes of fi nds. As a result, it was found that solifl uction variously affected the archaeological horizon in different parts of the slope. The effect was strongest in excavation 2, where two possibly overlapping episodes of fi rerelated activity have been reconstructed. Nevertheless, it is possible to separate two complexes differing in terms of fi nds, including signifi cantly modifi ed tools and bones with traces of human impact (“fi replace 1”) and a concentration of small artifacts (“fi replace 2”). In the upper part of the slope (excavation 4), near the stone structure, an accumulation of cores at the advanced reduction stages is reconstructed, as well as an area where ungulate carcasses were butchered. An area associated with primary reduction has been separated in excavation 1. The differential use of the camp area by its inhabitants seems to be an important feature of the subsistence strategy of the population of northern Mongolia during the initial stages of the Upper Paleolithic.

Research on Deformation Characteristics and Design Optimization of Super-Large Cofferdam Enclosure Structure

With the rapid development of urban transportation facilities, their construction inevitably encounters unfavorable conditions, such as rivers and lakes. When using the weir construction method to build transportation facilities in lakes, the design scheme for the pit slope excavation inside the cofferdam is related to the success or failure of the construction. In this study, the design scheme for pit excavations in lakes is discussed and analyzed using numerical simulation and on-site monitoring against the background of Jinji Lake Tunnel. The findings are as follows. (1) The greater the distance between the pit and the cofferdam, the smaller the impact of pit excavation on the cofferdam is; when the excavation depth is 10 m and the distance is more than 47 m, the deformation of the whole pile is less than 15 mm. (2) Under the condition that the platform width is kept the same, the smaller the height and width ratio is, the greater the safety factor will be, and under the condition that the height and width ratio is kept the same, the longer the platform width is, the greater the safety factor will be. (3) When the pit and cofferdam are far away from each other, different slope release design schemes have different effects on cofferdam deformation and stability. The results of this research can provide references and guidance for the design and construction of similar projects.

Multi-source monitoring data helps revealing and quantifying the excavation-induced deterioration of rock mass

There exist many high-steep rock slopes in Southwest China due to the construction of large-scale hydropower projects. The study on excavation-induced damage of high rock slopes is vital for disaster prevention and mitigation. Due to the complexity of high-steep rock slopes, assessing the excavation-induced deterioration of rock mass is often challenging. This study used the space-borne Interferometric synthetic aperture radar (InSAR) and multipoint displacement meters to monitor the slope displacements before and after the excavation. Based on the multi-source monitoring data and the parameter estimation method, we evaluated the changes in rock mass properties due to slope excavation. We employed an improved particle swarm optimization algorithm with dynamic topology and adaptive parameter adjustment and a neural network-based surrogate model in the parameter estimation. The degradation of rock mass strength and stiffness coincides with the increased sensitivity of slope deformation to rainfall infiltration. An in-depth analysis indicates that the absence of vegetation protection and excavation-induced deterioration of rock masses are responsible for the noticeable slope deformation during the rainy season. As slope excavation profoundly influences slope stability and deformation, we should pay closer attention to the excavation way and support style. This study also demonstrates the benefits of using multi-source monitoring data in slope deformation analysis. The findings can aid in comprehending the deformation evolution and instability mechanisms of rock slopes excavated at the hydropower sites, thereby contributing to the prevention and mitigation of landslide disasters.

Stability assessment of desander cut slope of Seti Khola Hydropower Project

Due to steep topography in the Himalaya, opening space for the development of infrastructures involves excavation of hillside slopes which possesses certain degree of risk associated with failure. This paper aims to assess the stability of the rock slope excavated for the placement of desander basin of the Seti Khola Hydropower Project (22 MW) located in Lekhnath, Kaski district of Gandaki Province. The height of the cut slope is about 60 m and is the challenging part of the construction work of this project. The slope is cut in the rock mass belonging to highly schistose graphitic phyllite intercalated with meta-sandstone at the upper part of the slope. To conduct a detailed stability assessment, the discontinuities, and geometric characteristics have been evaluated by field mapping. A three dimensional (3D) geological model has been generated to represent the geometric properties of discontinuities and the cut slope incorporating failure plane. The mechanical characteristic of the intact rock is established through literature review whereas the rock mass properties have been assessed using different equations. Rock mass quality has been assessed by using Rock Mass Rating (RMR) method of rock mass classification. RMR values are then correlated into Slope Mass Rating (SMR) incorporating different factors of slopes as per the site conditions. Further, kinematic analysis has been carried out using geometric and discontinuity properties to evaluate the structurally controlled failure. The influence of groundwater and earthquake has been considered while determining the shear strength of sliding surface. Finally, stability assessments have been carried out empirically, analytically and two dimensional (2D) numerical modelling.

Mapping the integrity of rock mass with GPR: case study in decommissioning mining

Slopes are built for the purpose of extracting ore, in the case of mining, or access roads in civil works. The excavation of slopes in tropical countries is facilitated by the thick layer of soil formed from the more intense weathering when compared to other countries. However, the residence time of water in the soil is relatively longer and consequently allows the accumulation and percolation of water through rock fractures even in the dry period. These factors induce a greater probability of occurrence of ruptures. Mines in the decommissioning phase must guarantee slope stability conditions even after closure in order to comply with legislation and environmental safety. In this work, the slopes of a decommissioning mine were investigated using geophysical methods (GPR) and structural analysis of the rock mass. The results were presented in the form of radargrams that correlate distance and depth of investigation. Structural data served as the basis for the execution of kinematic analyzes for planar and wedge ruptures. The analysis of the results allowed the correlation between electromagnetic signal attenuation zones, with the presence of water and the occurrence of ruptures. Thus, the GPR results allowed the recognition of structural discontinuities, accumulation zones and water flow.

Numerical and Experimental Investigation of Slope Deformation under Stepped Excavation Equipped with Fiber Optic Sensors

The real-time evaluation of slope stability is a crucial technical issue in foundation excavation and slope construction. However, conventional monitoring methods often fall short of achieving real-time and accurate measurements, which poses challenges to the timely assessment of slope stability. To address this problem, laboratory tests and numerical simulations were jointly used to evaluate slope stability in this paper. In numerical simulations, the finite element method (FEM) results clearly illustrate the distribution and evolution of internal strain during slope excavation, and the limit equilibrium method (LEM) calculates changes in the safety factor. In laboratory tests, the fiber Bragg grating (FBG) sensing technology was employed to monitor the internal strain of the slope in real time. The distribution characteristics of the slope internal strain field under the condition of stepped excavation were analyzed, and the feasibility of strain-based evaluation of slope stability was discussed. The measurements with FBG sensing technology agree well with the numerical simulation results, indicating that FBG can effectively monitor soil strain information. Of great significance is that the maximum horizontal strain of the slope is closely related to the safety factor and can be used to evaluate slope stability. Notably, the horizontal soil strain of the slope provides insight into both the formation and evolution of the critical sliding surface during excavation. The combination of numerical simulation and intelligent monitoring technology based on FBG proposed in this paper provides a reference for capturing strain information inside the slope and realizing real-time assessment and critical warning of slope stability.

Development of an Efficient Process Scheme for Breaking High-Grade Iron Ores of Low Strength and Stability During Sublevel Caving

Introduction. The main part of rich iron ores (73%) is mined in the Kryvyi Rih iron ore basin, most of which(160.5 million tons) are characterized by a low strength and stability.Problem Statement. One of the most important operations of slope excavation, which significantly affects the productivity of delivery vehicles and a crushing and processing complex, the quality and completeness of extraction of rich iron ores of a low strength and stability, is drilling and blasting operations to form a compensationspace with maximum, in terms of stability, dimensions and to hammer the main stock of the panel into it.Purpose. The purpose is to develop an efficient process scheme for breaking off reserves of rich iron ores of a lowstrength and stability, given the stress-strain state, efficient length of wells, and the quality of ore mass crushing.Material and Methods. The structural and functional analysis of the systems for the development of sublevel caving, the numerical calculations with the analysis and assessment of the parameters of outcrops of compensation chambers, the analysis and assessment of practical experience and scientific achievements in the field of increasing the efficiency of the ore breakage process, the analysis of techniques for the calculation of the parameters of drilling and blasting operations in the extraction of iron ores, the design of process schemes for breaking rich iron ores and their feasibility assessment.Results. For the first time, in this study, there has been developed a resource-saving version of the process schemefor the formation of a triangular-shaped compensation chamber and the hammering of the main stock of a breakage panel on it in the course of developing rich iron ore deposits of a low strength and stability, which allowspractically raising the efficiency by 7.8—18%, depending on the conditions of the breakage panel operation.Conclusions. The author has established the dependences of the angle of inclination of the inclined outcrop of thecompensation chamber and the line of least resistance. given the stress-strain state, the breakage energy intensity coefficient, the specific costs of breakage, and the efficiency on the distance of the breakage panel to the rocks of the hanging side across the strike of the ore deposit with one and two contacts of the breakage panel with collapsed host rocks.

Formation and Failure Characteristics of a Landslide Induced by Excavation in Western Henan, China

Engineering construction in mountainous areas is a key factor inducing slope failure, which poses severe threats to life and property safety during construction and operation. Thus, clear understanding of slope structure and potential failure mechanisms is of great importance for slope reinforcement. The Shangge landslide, located in a mountainous area of Western Henan, China, was triggered by excavation along a toll station. The slope was still unstable after a row of anti-sliding piles were constructed. To clarify the deformation characteristics and failure mechanism of this landslide and provide reinforcement guidance for slopes with similar geological conditions, a combined method of field investigation, displacement monitoring, and numerical simulation was employed. The results indicate that the natural slope comprises a dual structure of soil and rock, and that the soil, with poor permeability and high water moisture, was prone to form a potential sliding surface. Secondly, slope excavation was the direct triggering factor. Lastly, but most importantly, the preliminary investigation work failed to accurately expose the potential position of the sliding surface, and the existing anti-slide piles failed to cross the potential sliding surface, which made them unable to effectively improve slope stability. The numerical simulation verified that the recommended piles installed on the platform of level 2 could significantly improve slope stability. Therefore, when carrying out engineering slope design in similar geological environments, the slope structure and material composition should be fully identified, and the influence of groundwater on the slope stability state should be emphasized. These results can provide a reference for similar slope reinforcement designs.

Study on the influence of expansive soil slope on bridge foundation under excavation and rainfall conditions

AbstractExpansive soil is a kind of special soil that mainly composes of hydrophilic minerals and has significant deformation characteristics of water absorption expansion and water loss shrinkage. The characteristics often bring great harms to engineering construction. Relying on the bridge foundation on the expansive soil slope of the Yangtze‐to‐Huaihe Water Diversion Project, this study simulates the humidity field with temperature field for expansive soil using the numerical simulation method when short‐term or long‐term rainfall occurs during slope excavation. The horizontal deformation of bridge foundation on expansive soil slope considering four factors such as self‐weight of slope soil, excavation unloading rebound, hygroscopic expansion of expansive soil, and decrease of soil strength caused by change of water content was studied herein. The research results show that during the excavation process, the bridge foundation produces a horizontal displacement towards the top of the slope, and the rainfall after excavation introduces a decrease to the horizontal displacement of the bridge foundation and gradually develops in the opposite direction. During the excavation process, the rebound of slope excavation is the main factor affecting the horizontal displacement of the bridge foundation. Under short‐term rainfall conditions, the hygroscopic expansion of the slope soil becomes the main influencing factor. Under long‐term rainfall conditions, the main influencing factors of horizontal deformation of bridge foundation are the self‐weight of slope soil and the decrease of soil's strength.

Multi-Factor Analysis on the Stability of High Slopes in Open-Pit Mines

During the production of open-pit mines, the stability of slopes can be affected by various factors such as structural surfaces, production blasting vibrations, and mining areas. In this study, the researchers focused on the slope of the open-pit mine at Yinshan and employed UAV mapping technology to conduct an on-site geological engineering investigation. Information on the yield, trace length, spacing, and density of the structural surface of the south slope was obtained. The researchers also carried out vibration blasting tests in combination with the production blasting activities in the mine to determine the blasting vibration attenuation law and whether the blasting vibration speed met safety specifications. Additionally, numerical simulation methods were used to examine the influence of the mining area on the stability of the current slope and the designed excavation slope. The slope stability was evaluated using the limit equilibrium method, and the researchers separately discussed the influence of self-weight load and self-weight load plus blasting vibration force on the stability of the high slope of the open pit. The results showed the following: (1) The rock mass structural plane in the south slope of the mining area was mainly dominated by a medium-large dip structural plane, and three faults and joint fissures in the investigation area combined to form cutting and sliding surfaces in the rock mass that were prone to collapse and sliding. (2) The maximum blasting vibration speed met safety requirements. (3) There was no large range of plastic zone damage in the entire slope, and the overall stability of the slope was good. (4) The present slope was relatively stable when considering only self-weight stress and the blasting vibration force. However, there was a certain risk of instability in the design of the excavation slope.

Study on upper bound limit analysis of horizontal layers slope stability based on optimization method

Slope stability is an important problem in the field of geotechnical engineering. In order to widen the application range of upper bound limit analysis in engineering practice, this paper analyzes layered distribution characteristics of slope soil and establishes horizontal layers slope failure mechanism which satisfies the separation of velocity, then proposes calculation method for external force power and internal energy dissipation power using discrete algorithm. On this basic, this paper prepares cycle flow of slope stability analysis by upper bound limit principle and strength reduction principle, and develops stability analysis system by computer programming technology. Taking typical mine excavation slope as engineering background and calculates stability coefficient corresponding to different slope angles and evaluate analysis results accuracy by combining with limit equilibrium method. The results show that the stability coefficient error rate of two methods is between 3 and 5%, which can satisfy requirements of engineering practice. Moreover, stability coefficient obtained by upper bound limit analysis is an upper limit solution, and calculation errors are easy to eliminate, so it has certain applicability in slope engineering practice.