project Presentation2.pptx consolidation effect

consolidation effect

1. Methodology.

2. STANDARD PROCTOR COMPACTION (IS 2720- PART VII-1980) To determine the relationship between moisture content and dry density of soil. This test provides optimum moisture content (OMC) and maximum dry density ( MDD ) of a given soil. The results obtained from this test will be helpful in increasing the bearing capacity of foundations, decreasing the undesirable settlement of structures, controlling undesirable volume changes . Specific gravity (IS 2720(Part III)/SECTION I-1980) (IS 2720(PART V)- 1985) Specific gravity indicates the average value of all the solid particles present in the soil mass. Specific gravity is used in the computation of void ratio, degree of saturation and unit weight of soil. Liquid limit (IS 2720 (Part V)-1985) From the results of the liquid limit, the compression index may also be estimated. The compression index value helps in settlement analysis. It involves finding the water content that corresponds to 25 number of blows

3. Plastic limit [IS 2720(PART V)- 1985] The plastic limit is used for the classification of soils. In addition, the plastic limit of soil is also used, either individually or with other soil properties to correlate engineering properties such as compressibility, permeability, and shear strength . Shrinkage limit (IS-2720-PART-6-1972) A shrinkage limit test gives an indication of how much moisture content can change before any significant volume change. The shrinkage limit is useful in areas where soils undergo large volume changes when going through wet and dry cycles (e.g., Black cotton soil) due to seasonal variation .

4. CONSOLIDATION TEST- ( OEDOMETER TEST)(IS 2720-PART-15-1986 ) This test simulates one dimensional primary consolidation with double drainage. The following parameters are determined a. Pressure-void ratio relationship b. Compression and Recompression index c. Coefficient of consolidation at various pressures d. Preconsolidation pressure e. Degree of consolidation at any time f. Rate of consolidation under vertical loads The above information can be used to predict the time rate and extent of settlement of structures founded on fine-grained soils.