ABSTRACT:

The present work demonstrates the stability analysis of a cut slope in Jhakri area, Himachal Pradesh, India. The recent developments along the left bank of Sutlej valley have witnessed various activities such as widening of road, human settlement and hydropower projects. These actions have left the National Highway 22 very unfavorable from rock slope instability problem. In this paper, an attempt has been made through kinematic analysis and finite element simulation to understand the failure mechanism of vulnerable slope with highly jointed rock mass. The study provides an illustration that the slope is unstable because of intersecting joints with unfavorable attitude and stress accumulation at the toe region.

1 INTRODUCTION

Himalayan region comprises one of the largest active mountain chain on the earth with young, immature and undulating topography with diverse monsoonal season. The fragile and highly deformed nature of rocks has turned this region to be most vulnerable towards different types of slope failures (Sarkar et al. 1995, Chauhan et al. 2010, Pal et al. 2012, Singh et al. 2014). The current advances along the left bank of Sutlej valley around Jhakri area, Shimla in Himachal Pradesh, India has led to various activities such as widening of road, human settlement and expansion of hydropower projects. Lack of geological and geotechnical investigation prior to engineering constructions has created stability problem along the road. Due to these unscientific design methods, stress disequilibrium has set up resulting in slope failure in study area. The collapse of slope puts human life in grave danger as well as spawns huge economic loss. The failed rock masses possess serious disruption in communication in the Rampur-Jhakri region especially in the monsoonal season (Sarkar & Singh, 2008a, b, Singh et al. 2013). The present study deals with a road cut slope in Jhakri area, Himachal Pradesh, India, along Tibet Border Road, National Highway (NH) 22. An integrated approach of structural analysis and numerical simulation through Finite Element Method (FEM) has been implemented to identify potentially vulnerable slopes and to get an insight about deformational mechanism of the area.

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