Effective Shear Strength Parameters of Remoulded Residual Soil


Asmaa Gheyath Salih

Department of Geotechnical Engineering, Faculty of Civil Engineering, University Technology Malaysia, Malaysia
e-mail: asmaa_g_s@yahoo.com

Khairul Anuar Kassim

Geotechnical & Transportation Department, Faculty of Civil Engineering, University Technology Malaysia, Malaysia
e-mail: kanuar@utm.my



Many of soilís geotechnical characteristics are involved in the construction problems. Soil will eventually reach failure and deform excessively when it is subjected to gradually increasing load. This failure is related to the shear strength which is considered as one of the most important engineering properties of the soil. This research focuses on comparison of effective shear strength parameters (c', f') that are obtained from both CU and CD triaxial tests for remoulded residual soil (silt). This paper presents a reduction factor that helps to evaluate the effective internal friction angle of CD test from the results of CU test. The reduction factor is in the range of 0.89 to 0.92 that came as a result of our study to samples of residual soil with deferent initial water content. The initial water content had an influence in triaxial compression testing on the soil strength; soil effective cohesion became higher in the range of 11% up to 29 % when initial water content changed from 53% to 43%, and soil effective friction angle would increase by 3% up to 6%.

Keywords: Effective shear strength parameters, residual soil, triaxial compression tests, initial water content.

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