Department of Earthquake Engineering, Indian Istitute of Technology, Roorkee
The seismic safety of 260.5 m high rock-fill Tehri dam located in seismically active zone has been investigated. Simple stability and linear 2D stress analyses for such a high dam are carried out when subjected to severe ground motions, which are likely to undergo large nonlinear deformations. The dam was later analyzed for various levels of shaking considering all possible worst-case scenarios in Himalayan environs. One such test to a Maximum Credible Earthquake (MCE) producing Peak Ground Acceleration (PGA) 0.5g at the dam site is presented here which includes sequential non-linear static and nonlinear earthquake analyses using the Mohar-Coulomb material model for the rock-fill and the clay core materials. The dam undergoes plastic deformations mostly at the u/s and d/s slopes, which may not lead to any possible failure.
