Abstract
This research work was undertaken to evaluate the failure analysis of HavelianLandslide which was triggered by rainfall in November, 2015. A site visit was made to collectlandslide matrix material samples. Basic in-situ measurements and laboratory tests were performed onreconstituted samples for determining the basic engineering properties of the samples. Series of directshear tests were conducted on reconstituted samples at in-situ landslide matrix material density byvarying percent saturation to evaluate its likely effect on the mobilized shear strength. Finally theSlope/W software was utilized to calculate the Factor of Safety (FOS) along the probable surfacefailure, by in putting the shear strength parameters corresponding to different degrees of saturation.The analysis revealed that the shear strength of matrix soil decreased with the increase in degree ofsaturation (% age) and slope become critical around 50% degree of saturation.
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