深埋地下洞室局部让压效应及能量演化规律

Abstract: In order to reduce the dynamic disaster caused by rockburst , by using the energy principle ofrockburst , the concept of non-uniform thin-wall stress concentration is put forward. The analysis shows thatthe location of rockburst is stress concentration and high stress gradient.On basis of the construction ofpractical engineering ,and FLAC3 numerical simulation software was developed by FISH programming;theenergy evolution rules of deep underground cavern with dynamic load and the failure forms and dynamiceresponse of yield space of steel frame are systematically studied from the local yield of surrounding rock. The researches show that due to the local yield effect of the surrounding rock , the disturbance to the sur-rounding rock is reduced , and the shockwaves energy is absorbed and reflected in the working face , resul-ting in weak dynamic response and reduced dynamic load.After the excavation of the cave ,the rock massis firstly tension and then shear failure , and the residual elastic strain energy is released.The location ofrock burst is directly connection to the orientation of the maximum principal stress of the rock mass.