Slope instability analysis in Phyllitic rock in the Lesser Himalayan using three different modeling approach
The numerical methods for slope stability problems always have a serious concern related to their continuum and discontinuum nature. In continuum methods, such as the finite element method and limit equilibrium methods, rock materials are usually considered as having a continuous nature. Where commonly practiced, discontinuum methods, like the discrete fracture network method and the discrete element method, are typically controlled by their discontinuous behavior. One of the key objectives of the present article is to emphasize the stability analysis for the development of the religious road corridor, NH-7, in Uttarakhand using different numerical manifold methods (conventional method, continuous method and discontinuous method). To investigate these aspects, eight different sites have been chosen from the Lesser Himalayan region. The geotechnical data have been collected through site visits with the help of a number of rigorous field studies. The rock exposure on the sites is mostly discontinuous in nature, having Phyllitic rock mass characteristics. The safety factor resulting from numerical analysis incorporating the Mohr–Coulomb failure criteria showed that limit equilibrium analysis has a decent correlation with the discrete element method (<10%) than finite element results. The article also discusses the principal stresses, maximum and minimum displacements variation in FEM and DEM modelling. Also, the results from the present study reveal that not just a single mode of numerical analysis is appropriate to predict accurate results for initiating economic remedial measures.
Keywords: FEM (finite element analysis), LEM (limit equilibrium method), DEM (discrete element method), Phyllitic rock