METHOD FOR DETERMININGG PLASTIC STATE OF SURROUNDING ROCKS OF GATE

According to Mohr-Coulomb yield condition and non-related flowing rule in consideration of the crustal stress field and engineering characteristics of underground gate,we propose a method for determing the plastic state of sorrounding rocks of gate. By FEM analysis of sourrounding rocks for the unsupported gate and bolt-supported gate,we got the result that to support the gate by bolt immediatly after digging the gate, it can improve the stiffness and strength equivalently of the surrounding rock.