Stability analysis of slope of a pump house building and water storage tank at Narkanda, India: A case study

Slope stability analysis is essential in civil engineering, assessing slopes in various applications like dams, embankments, excavated slopes, and natural slopes. Techniques for slope stability analysis include limit equilibrium methods, empirical approaches for rock slopes, and finite element or finite difference methods. The present study is to conduct the stability analysis of slope which damaged the storage tank and pump house building of Jal Shakti Vibhag at Madhuban (Narkanda) Shimla, Himachal Pradesh using limit equilibrium method (LEM) and finite element method (FEM) and suggest appropriate mitigation measures. In this study slope is analyzed in natural state, and after application of proposed mitigation measures using self-driving anchor (SDA) or/and RCC micro piles analyzed for both static and dynamic conditions under dry and wet conditions. The values of FOS obtained by LEM in natural state under static dry and saturated conditions are 1.41 and 0.875 and dynamic saturated conditions are0.95; the FOS obtained after applying mitigation measures SDA installing at an angle of & Oslash; =10 degrees is 1.45. The values of FOS obtained from FEM analysis in natural state under static dry and saturated conditions are 1.52 and 0.98; dynamic saturated conditions are and 0.55. FOS obtained using combination of SDA and RCC micro piles and under static dry and saturated conditions are 2.75 and 2.23 and using dynamic analysis under dry and saturated conditions are 2.00 and 1.60.