RELATIONSHIP BETWEEN COMPECTIVE EFFORT, HYDRAULIC CONDUCTIVITY AND SHEAR STRENGTH OF COMPECTED SOILS

Abstract

With the rapid economic growth, domestic living standard improvement and urban population increase in India, a tremendous amount of municipal solid waste is being generated every day and is becoming one of the foremost issues of urban management. The planning and management of domestic waste is important to both the municipalities and the local community for a variety of reasons including environmental impact, financial cost, health and hygiene, city beautification, natural resource consumption. In order to achieve the goal which is to protect the environment, a proper waste disposal system is necessary for which a competent base liner is very important and need to be designed appropriately. Shear strength is an important property to determine the stability of liner. A liner material must be able to withstand any physical force such as stresses. To construct a soil liner with acceptable shear strength and permeability values, compaction is usually carried out at site to improve the soil properties of liner. A proper planning was also required for a competent landfill. The planning is such as pre-treatment of waste, for example eliminate or reduce the concentration of certain unwanted material such as heavy metals and organic substances. Liquid generated at landfill, also known as leachate, also need to be collect, reprocess and periodically analysed. To construct a soil liner with good shear strength and sufficient impermeable value, compaction is usually carried out at site to improve the soil liner. Compaction is a process where is carried out to increase the shear strength, to decrease the permeability A study was conducted in the laboratory to investigate the relationship between the degree of compaction of soil and its effect on the shear strength. Types of compaction used in the test are standard. Soil properties such as specific gravity, Atterberg limit and particle size distribution are also determined in the laboratory test. The soil used in this test was a silty clay. Test result shows that the silty clay is classified as soil with high plasticity, CH under the Indian Standard with specific gravity of 2.71, liquid limit of 53% and plasticity of 26%. The results indicated that the higher degree of compaction under low moisture content and mixing with some various percentage of Fly Ash it will give higher shear strength for soil. The maximum dry densities and were found 1.691 g/cc. It is also observed that addition of Fly Ash of such proportions there is a significant change shown in decreasing permeability of soil.