ABSTRACT
A total of eighteen stress measurements were performed in the rock and rock-like blocks in the laboratory to estimate the influence of anisotropy in a transversely isotropic model. A laboratory stress measurement system was established with a coring machine and a biaxial loading system by flat jacks to simulate the in-situ rock stress conditions in the laboratory. The isotropic analysis was compared with the anisotropic analysis with respect to stress measurement to investigate the influence of anisotropy. The maximum difference between the isotropic and the anisotropic analysis was 34%, and stress measurement considering anisotropy was needed. To confirm the validity of the observed strain responses during overcoring, a diagnostic analysis of stress relief curve was conducted using the three-dimensional finite difference code, FLAC3D.
