Non-Euclidean model for zonal failure of deep roadway under the permeation action

In the process of deep mining,roadway surrounding rock presents zonal failure characteristic. The hydro-stat- ic non-Euclidean stress distribution solution of deep roadway under permeation action is obtained aiming at coal and gas outburst,floor failure and other practical engineering problems. The new stress solution consists of two parts:one is the classical solution;the other one is the non-Euclidean solution. The Mohr-Coulomb yielding criterion is applied for the condition that the new stress distribution causes zonal failure phenomenon. Through the numerical calculation,the following conclusions are obtained:When there is the permeation action,the zonal failure phenomenon still exists for deep surrounding rock;far field permeation pressure reduces the angular stress of roadway,and borehole permeation pressure influences the angular stress very small;under the far field permeation pressure,the increase of porosity re- duces the angular stress of roadway;using the Mohr-Coulomb yield criterion,the location and width of the failure zones are estimated;by using the non-Euclidean model under the permeation,the zonal destruction in the process of coal mining is explained. The present study offers a reference to understanding the zonal failure in deep surrounding rock under the permeation action.