Study on Softening Critical Load of Surrounding Rock in Deep Mine Roadway Under Different Depth Conditions

In order to study the softening critical load of the surrounding rock in the mine roadway, a numerical model with different generalized surrounding rock st rength was established.With the analysis on the numerical simulation calculation, the failure features of the different generalized surrounding rock strength under the dif ferent load role were investigated.The paper had a study on the failure features of the surrounding rocks within 35 times wide than the mine roadway width around the s eam.With the analysis on the different strength surrounding rock affected to the load mechanics response, the softening critical load of the surrounding rock was obtain ed.The results showed that the softening critical load of the immediate roof was 17.520.0 MPa, the softening critical load of the seam was 12.520.0 MPa and the softeni ng critical load of the immediate floor was 15.017.5 MPa.The conditions of the basic roof and basic floor were same and the roof and floor within the mining depth scale were stable.