Pornthep Asanittong creator Akagi, T. Chairperson Balasubramaniam, A.S. Examination Committee Brenner, R.P. Examination Committee Government of Canada Scholarship Donor text series technical report th Bangkok Asian Institute of Technology 1980 continuing eng v, 113 p. In order to study the effect of displacement type sand drain installation on strength and compressibility of soft Bangkok clay unconfined compression tests, laboratory vane shear tests, isotropically consolidated undrained tests, vertical and horizontal consolidation tests were carried out on the undisturbed samples, the samples taken at certain time intervals after the installation and the samples completely remolded by hands. In terms of compressibility, at the depths of 2.5 m, 4.5 m and 7.0 m, the soil characteristics observed were the consolidation curves, the virgin compression index and the rate of consolidation. It was found that the disturbance effect on vertical and horizontal compressibility's for the post installation samples was considerable at a depth of 7.0 m. The vertical and horizontal coefficient of consolidation were affected greatly throughout the soft clay layer. In terms of shear strength, the layer between 2.5 m and 6.0 m were investigated. The degree of disturbance immediately after the installation was determined. The subsequent water content, undrained shear strength and their relations were observed. It was found that on the average the shear strengths inunediately after the installation were reduced to a half of the difference between those of the undisturbed and remolded samples. However, it appeared that, subsequently, the reduced shear strength after installation tended to increase with decrease in water content along the straight line representing the relationship between the water content and the logarithm of undrained shear strength. This straight line was found approximately in parallel with the water content versus the logarithm of consolidation pressure. A thesis submitted in the partial fulfilment of the requirement for the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 1980 Shear strength of soils Testing Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B22008 http://203.159.5.9/ait-thesis/detail.php?q=B22008 951012 20260818095231.0