ISSN 2319-5347, ISI Impact Factor: 0.763

VOLUME 03 NO. 02 APRIL 2014:

Title:        Study on the salinity and pH and its effect on geotechnical properties of soil in south-west region of Bangladesh
Authors:   Rahanuma Tajnin, Tabassum Abdullah, Md. Rokonuzzaman
Abstract:  The soil in the south-west region of Bangladesh has much salinity and pH. The high salinity and pH may lead the changing of geotechnical properties of soils. The study zone is the south-west region of Bangladesh. Samples have been collected from 22 different locations of 8 districts (Khulna, Jhalkathi, Satkhira, Bagerhat, Borguna, Vola, Pirojpur and Potuakhali). The properties of soil obtained from all laboratory tests are specific gravity, plastic limit, liquid limit, shrinkage limit, particle size distribution (percentage of sand, silt and clay), moisture content, unit weight, shear strength, compression index, recompression index, initial void ratio,and preconsolidation stress. The soil used in this investigation is “Inorganic silts of medium compressibility and organic silts” as per Casagrande Plasticity Chart. The variation of different properties of soil with salinity and pH has been evaluated in graphical representation. A specific trend in varitation is obtained. The specific gravity of soil is almost same and the there is no variation with salinity and pH. Moisture content decreases with salinity but increase upto peak and then starts to decrease with pH. Shrinkage limit and plastic limit decrease with salinity and pH. Liquid limit and unit weight increase with salinity but decrease with pH. Undrained shear strength, recompression index increase with salinity and pH. Compression index increases with salinity but do not vary with pH. Initial void ratio increases upto peak then decreases with salinity but do not vary with pH. Preconsolidation stress increases upto peak then decreases with salinity but increases with pH..

Keywords:  Salinity, pH, Engineering properties, Physical properties, Soil salinity test
Page No:    138-147

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