MODELLING OF SOME SLOPE SECTIONS ALONG ALAKNANDA RIVER

Abstract

The slopes near highway, residential area and along reservoir rim are vulnerable and require special attention. These slopes are analyzed extensively for potential failure as any movement in slope cause significant damage to infrastructure and lives residing nearby it. This is achieved through an extensive investigation and monitoring program, and supported by detailed numerical modelling studies. In this dissertation work an endeavour has been made to study two slope sections along the bank of river Alaknanda from an upcoming dam project site at vishnugad in Uttrakhand in India. ;In the present study- the probabilistic nature of the input shear strength parameters which are required for slope stability analysis has been proposed. Probabilistic analysis has been preferred because in deterministic analysis usually single fixed value of parameter is used in the analysis. The stability analysis is carried out using one set of geotechnical parameter. However most input values measured in the field or obtained by laboratory tests which are used subsequently to analyze the problem show a wide scatter across a significant range rather than being a fixed single value. Numerical Analysis has been done using Finite Difference FLAC-2D software and Finite Element PHASE-2 software. Application of the numerical modelling enabled a representative simulation of observed slope conditions. Input parameters are based on the statistical analysis. The factor of safety of slopes is determined at various conditions. The stability of slopes is further studied for, limit equilibrium using computer programs developed for planer, and circular failure. 111