Numerical Evaluation of Slope Stability measures: A Case Study ofBirham Landslide, Murree, Pakistan.

Abstract

Slope failures endanger the public safety and one of major hazard considered in mountainous terrain. In this paper, slope stability measures have been evaluated using the limit equilibrium method (LEM).A case study of slope failure from Birham land slide, Murree, Pakistanhas been modelled using SLOPE/Wprogram. In-situboring tests are performed to collect laboratory test specimens. Geotechnical properties (i.e. shear strength and stiffness parameters) for the idealised slope sections are based onlaboratory testsperformed onthecollected in-situ specimens. Slope stability measures are evaluated in terms of factor of safety (FoS) for static and dynamic loading. Pseudo-static method is used for dynamic analysis, considering the Peak ground acceleration (PGA) from seismic hazard map of Pakistan. Results shows that static and dynamic FoS of original slope are inadequatetherefore resistance to slip surfaceof original unstable slope is provided by slope geometrymodification with pile reinforcement. Based on these remedial measures, computed FoS of modified slope are found to be sufficientfor static and dynamic slope stability.