SLOPE FAILURE ANALYSIS OF HAVELIAN LANDSLIDE, ABBOTTABAD PAKISTAN

Abstract

This research work was undertaken to evaluate the failure analysis of Havelian
Landslide which was triggered by rainfall in November, 2015. A site visit was made to collect
landslide matrix material samples. Basic in-situ measurements and laboratory tests were performed on
reconstituted samples for determining the basic engineering properties of the samples. Series of direct
shear tests were conducted on reconstituted samples at in-situ landslide matrix material density by
varying percent saturation to evaluate its likely effect on the mobilized shear strength. Finally the
Slope/W software was utilized to calculate the Factor of Safety (FOS) along the probable surface
failure, 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 of
saturation (% age) and slope become critical around 50% degree of saturation.