Study on the value range of horizontal ground stress in initial geostress field based on the Generalized Hoek - Brown criterion

On the conditions that assuming vertical ground stress and horizontal ground stress are both principal stress, a calculation model of horizontal ground stress value range with depth change in initial geostress field is built by formula derivation, according to the Generalized Hoek-Brown failure criterion, and the reasonability of the calculation model is verified by the geostress measured value. The results show that, there is a good consistency at the distribution range of horizontal ground stress calculated value and horizontal ground stress measured value, it is proved that the the calculation model is reasonable. The calculation model gives new methods and thinking for evaluation of the initial geostress field.