Geotechnical Characteristics Of Soil Research Articles

Impacts of Contaminants from Different Sources on Geotechnical Properties of Soils

Within sites affected by industrial, domestic, and agricultural contaminants, the geotechnical characteristics of soils are susceptible to a certain degree of deterioration. The resultant corrosion of concrete exacerbates the vulnerability of underground structures, posing a potential hazard to the stability of superstructures. However, the current lack of comprehensive understanding regarding the precise influence of contaminants from different sources on the geotechnical properties of soils underscores the critical need for further research in this field. This review aims to elucidate the underlying mechanisms of various impacts, revealing that the permeability, shear strength, and compressibility of soils can either increase or decrease depending on the specific contaminants present. Notably, even though these impacts may not manifest prominently in the short term, their persistence can endure over an extended duration. The primary objective of this comprehensive review is to draw the attention of the scientific community and policy makers to this issue, emphasizing the need to mitigate potential hazards and safeguard a habitable environment for present and future generations.

Impacts of petroleum spills on geotechnical properties of soils: A review

Environmental pollution caused by crude oil spills had increased recently in Nigeria, due to increase in crude oil production and the activities of crude oil thieves. This review work was embarked upon to evaluate the impacts of crude oil petroleum products spills on the geotechnical properties of different soils found in Nigeria. The review tried to provide a summary on the influence of crude oil on the Atterberg limits, compaction, permeability, angle of internal friction, cohesion, and consolidation properties of soil samples. Findings from this review revealed that the geotechnical characteristics of soils can be remarkably altered by crude oil and petroleum products impaction. Most of the literatures reviewed indicated a reduction in the Atterberg limits, the compression index (Cc) and the permeability of the soils, as the volume of crude oil in the soils increased. The literature review depicted that the rate, at which the soils’ geotechnical properties were altered, was a factor of the oil volume contained inside the soils and the impacted soil biochemical properties.

Influence of chemical, mineralogical and geotechnical characteristics of soil on earthen plaster properties

Earth is perfectly suited for indoor plastering purposes thanks to its numerous technical, ecological and economic assets. The quantity of clay is frequently evoked to explain fresh and mechanical performances of earthen coatings but this indicator fails to give full account of the diversity of earth behaviour encountered in earth construction. This paper aims to examine plaster properties from the point of view of their geotechnical and mineralogical composition. Four types of soil were employed to design earthen plasters with variable earth to sand ratios. The behaviour of coatings was assessed through their water requirement, linear shrinkage, and flexural and compressive strengths. A noteworthy relationship was detected between the water requirement of earth plasters and the liquid limit of the raw earth employed. The mechanical resistances of plasters were found to be linked to the cation exchange capacity of the soils. The correlations between linear shrinkage, or compressive strength, and percentage passing at 2 µm were strong, justifying the widespread use of texture and clay content for soil classification, and assessment of the properties of earth-based building materials.

Geotechnical properties of hydrocarbon-contaminated soils: a comprehensive review

The geotechnical characteristics of hydrocarbon-contaminated soils have been concentrated heretofore due to the alarming frequency of hydrocarbon contaminations and their significant consequences. Over the past three decades, numerous research studies have been conducted in order to investigate hydrocarbon-induced changes in geotechnical properties of soils. The present article is aimed at extensively reviewing almost all relevant academic literature on this subject, and, due to various kinds of soils and hydrocarbon compounds, it tries to provide a brief summary of each research study along with its key findings. By this review, it was revealed that geotechnical characteristics of soils, such as particle size distribution, Atterberg limits, permeability, optimum moisture content, maximum dry density, compression index, coefficient of consolidation, over-consolidation ratio, cohesion, angle of internal friction, unconfined compression strength, shear strength, and so on, can be remarkably influenced by hydrocarbon contaminations. However, the amount of these hydrocarbon-induced changes were highly dependent on various factors, including soil and hydrocarbon properties, environmental and operation conditions, weathering process, etc., so that, for each specific geotechnical property, various alterations were reported in scientific literature.

Freeze–thaw performance of base course treated with carboxylated styrene–butadiene emulsion–Portland cement

Freeze–thaw (FT) cycles and moisture susceptibility are important factors influencing the geotechnical characteristics of soil–aggregates. Given the lack of published information on the behaviour of base course materials stabilised with styrene butadiene emulsions (SBE) and cement–SBE-treated base (CSBETB) under environmental conditions, especially freezing and thawing, this study investigated the effects of these additives on the CSBETB performance. The primary goal was to evaluate the resistance of CSBETB to moisture damage by performing FT, Marshall conditioning and AASHTO T-283 tests and to evaluate the long-term stripping susceptibility of CSBETB while also predicting the liquid antistripping additives to assess the mixture’s durability and workability. Specimens were stabilised with Portland cement, SBE and a Portland cement–SBE mixture and cured for 7 days, and their short- and long-term performances were studied. Test evaluation results show that the additions of additives increase the resistance of the mixtures to moisture damage. Results of durability tests performed for determining the resistance of compacted specimens to repeated FT cycles indicate that the specimen with the 4% cement–8% SBE mixture significantly improves water absorption, volume changes and weight losses. This indicates the effectiveness of this additive as a road base stabiliser with excellent engineering properties.

Effect of fly ash, construction demolition waste and lime on geotechnical characteristics of a clayey soil: a comparative study

Improvement of strength and subgrade characteristics of soil by stabilization is one of the popular techniques nowadays. The use of construction demolition (C&D) waste in soil stabilization is still under research as much work has not been done in this area. This paper presents a comparative study of utilization of fly ash, C&D waste and lime in soil stabilization. A number of tests such as differential free swell, pH, compaction, unconfined compressive strength (UCS) and California bearing ratio (CBR) were conducted to study the effect of addition of fly ash, C&D waste and lime on geotechnical characteristics of soil. Based on results, it is concluded that differential free swell and maximum dry density decrease, whereas pH, UCS and soaked CBR value increase with addition of fly ash, C&D waste and lime. The increase in UCS is almost the same for lime and C&D waste at 7 days which indicates that the usage of C&D waste compared with that of lime is economical, whereas if used in pavement subgrade lime is better material because of higher CBR value. The UCS at 28 days is more for fly ash compared with that for lime and C&D waste.

Geochemical and Geotechnical Characteristics of Soil within Oke-diya Dumpsite in Sagamu South Western Nigeria

Geochemical and Geotechnical Characteristics of Soil within Oke-diya Dumpsite in Sagamu South Western Nigeria

Effect of Coir Waste on the Geotechnical Characteristics of Soil

Abstract Kerala (the southernmost state in India), which is named after a coconut tree, is the first place that produced coir. The process of coir extraction produces coir waste, the disposal of which is becoming a major problem recently. Coir waste includes dusty matter called coir pith, along with some baby fibers. Studies have not yet been conducted on the influence of these coir wastes regarding the engineering behavior of soil. Two types of soils viz. lateritic soil and soft clay have been considered using different percentage of coir waste ranging from 0.5 % to 3 % by weight of soil. The main objective of the present investigation is to assess the usefulness of coir waste as a soil admixture and is focused on its influence on the engineering properties of soil. The present study covers the characterization of soils and coir pith, compaction behavior, CA bearing ratio, swelling and compressibility behavior. The results show that addition of coir waste modifies the geotechnical characteristics of both types of soils.

Slope Stability Analysis for High Embankment with Meta-computing Technique “A Case Study of NATRAX High Speed Track”

In the present study an attempt has been made for find out the reason of slope failure on the basis of site investigations, experimental and design analysis to provide the standard geotechnical properties of materials with the suitable side slope. Some geotechnical characteristics of soil as Grain size, Optimum moisture content and Cohesive strength has been taken in consideration to design and construct the high embankment up to 20m. The optimization of side slope with required factor of safety as per IRC guideline has been also attempted in the present study. Treatment of embankment slopes for erosion control is considered to prevent from damage due erosion from rain and wind.

Influences of Diatom Microfossils on Engineering Properties of Soils

This paper examines how geotechnical characteristics of soils can be influenced by the presence of diatom microfossils, using an artificially prepared mixture of soil and diatomite. Test results indicate that the presence of diatom microfossils substantially alters the index properties as well as other fundamental engineering behaviours of a soil, owing to the predominantly hollow structures of microfossil skeletons having rough and interlocking surfaces. For example, with the increase in diatomite content, compressibility and the internal friction angle of a soil increase. This study has also made an attempt to quantify the diatom microfossils present in natural soils.

Weathering and regolith properties at an earthflow site

Abstract The influence of weathering on the physical, chemical and geotechnical characteristics of soils has been examined for both unstable and adjacent stable ground at a site in North Island New Zealand where earthflows have developed in regolith overlying Tertiary calcareous mudrock of marine origin. The same sequence of weathering zones was visually identified during sample extrusion for both the unstable and stable ground, although the earthflow sites were characterized by extension of weathering to greater depths. Both the characteristics of the weathering zones and the relationships between calcite content and geotechnical index properties show significant similarities to those reported for the Fuller's Earth in the UK. Variations in density and moisture content throughout the profiles are attributed to variations in the extent of stress relief fissuring, augmented by a calcite content which varies with depth and position on the slope. If the variation in dry density (and moisture content) due to calcite content alone is removed, the depth at which stress relief fissuring becomes prominent can be readily discerned and appears to be associated with the zone of basal shear in the earthflows. Physico-chemical swelling appears to be absent, even though the soil mineralogy is dominated by Casmectites. Post-failure weathering, clay mineral alteration and calcite removal are expected to provide a mechanism for promoting gradually increasing earthflow instability.