ENGINEERING CLASSIFICATION OF SOME SOIL SAMPLES OF MIRPUR AREA, DHAKA,BANGLADESH

Engineering Geology

This paper deals with the geotechnical index parameters of subsurface soil of Mirpur area of Dhaka. Geotechnical parameters such as moisture content, specific gravity, grain size, liquid limit, plastic limit, plasticity index have been determined and evaluated for ground condition. The natural moisture content range from 21.15% to 24.94% which is very closer to the plastic limit values that represents the soil is normally consolidated. The analyzed soil is well graded. The specific gravity values of analyzed soil are very closer to each other and nearer to the typical value of kaolinite. Soils of the study area are characterized by yellowish brown very dense medium to fine sand, silty sand and stiff silty clay. The sand, silt and clay percentages range from 3% to 85%, 20% to 78% and about 20% respectively. The sand is increasing with depth and silt is decreasing with depth. The liquid limit ranges from 17% to 47% which suggest that the soil is intermediate plasticity clay soil. Plastic liquid limit ranges from 31% to 34% and plasticity index 13% to 16%. The liquid limit, plastic limit and plasticity index values are closer to the typical values for kaolinite. The analyzed soil is intermediate plasticity clay and is grouped medium plasticity (MI) from their position of plasticity chart.

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