Deformation Back Analysis of Test Tunnel of Tianhuangping Pumped Storage Project

In order to ascertain the initial stress field in rock around the underground powerhouse of Tianhuang-ping project, a test tunnel was excavated along its longitudinal axis and deformation in the surrounding rock and convergence deformation on the boundary of the opening were measured. Back analysis on elasticity was proceeded based on the measurements by BEM. Results agreed with those measured by other methods.