Analysis of Influence Factors on Surrounding Rock Pressure of Rocky Tunnel

Adopting the classical theoretical formula method,the analytical calculation and numerical simulation,this paper analyzed the influence rules of tunnel embedded depth,initial geostress,span length,lateral pressure coefficient,tunnel section shape and rock physical mechanical parameters on surrounding rock loosening pressure of tunnel.The results show that when surrounding rock is in elastic state,loosening pressure of surrounding rock has positive linear relationship with tunnel embedded depth,initial geostress and bulk density of the rock mass;vertical loosening pressure of surrounding rock has inverse linear relationship with lateral pressure coefficient,while horizontal stress has positive linear relationship with lateral pressure coefficient;tunnel section shape has a certain influence on loosening pressure of surrounding rock;the effect of rock deformation modulus,cohesion,internal friction angle and Poisson's ratio on loosening pressure of surrounding rock can be neglected.Meanwhile,the disadvantages of these methods are discussed in this paper.