...] show these main methods of evaluating in situ stress state in an engineering area. According to Table 1, the commonly-used empirical eigenvalue of 20MPa cannot meet the quantitative evaluation requirement of a project design. Regarding the ratio of horizontal stress to vertical stress, after...

... determination method (ISDM), in which several techniques are utilized [1]. Due to the limitation of time, cost, and sometimes, site conditions, only a restricted number of well-planned in-situ stress measurements can be conducted in each project in the engineering area. These results are usually scattered...