Failure Mechanism and Numerical Simulation of Splitting Failure for Deep High Sidewall Cavern Under High Stress

With the increase of depth underground engineering, phenomenon splitting failure deep rock will appear, which is very different from shallow cavern. In order to reveal formation mechanism failure, mechanical model test and numerical simulations were carried out respectively. Using Pubugou Hydropower Station as engineering background, a three-dimensional (3D) geomechanical was conducted relying on high stress load system. The sidewall cavern observed, oscillation variations displacement measured. Based strain gradient theory continuum damage mechanics, an elastic–plastic softening for established. relationship between energy dissipation analyzed. density theory, criterion based A analysis method proposed, regional disintegration calculation program developed commercial finite element code. simulation results are in basic agreement with 3D test.