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دانلود رایکان مقاله انگلیسی ISI با موضوع ویژگی های قدرت برشی و ویژگی های شیمیایی زه آب آلوده خاک های لاتریتی

عنوان فارسی مقاله:

ویژگی های قدرت برشی و ویژگی های شیمیایی زه آب آلوده خاک های لاتریتی

عنوان انگلیسی مقاله:

Shear strength characteristics and chemical characteristics of leachate-contaminated lateritic soil

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6. Conclusions

An extensive laboratory testing program was carried out to study the effect of leachate contamination on the Atterberg limits, shear strength parameters and chemical characteristics of lateritic soils. The following conclusions are made based on the test results: The leachate can alter the Atterberg limits of lateritic soils. All the leachate-contaminated lateritic soil samples showed an increase in liquid limit and plasticity index values. The increase in liquid limit (wL) and plasticity index (Ip)of the lateritic soil is attributed due to change in nature of pore fluid which is shown by increase in clay content of the soil. The disintegration of clay particles from the aggregates due to acidic or alkaline leachate in the pore media tends to increase in specific surface area of soil which leads to high adsorption of water that changes the limit values. Shear strength parameters of lateritic soils are affected by leachate contamination. For specimens tested at the Proctor density, effective cohesion increases and effective friction angle decreases due to increase in leachate concentration. The increase in clay content of lateritic soil after interaction with the leachate has increased the cohesion and hence the friction angle decreases. Chemical characteristics of soil are altered depending upon the leachate constituents or the concentration of individual components. The pH of soils is marginally altered due to leachate. The increase in cation exchange capacity of soil may also be attributed due to marginal increase in pH value of soil with leachate. The increase in electrical conductivity, calcium, sulphate and iron content is due to leachate characteristics.