Numerical Simulation of Roadway Surrounding Rock Damage Evaluation Based on Damage Risk Indexes

Based on Mohr-Coulomb strength criterion, damage risk index was established to evaluate the damage degree of roadway surrounding rock. In addition, the damage risk index program code was written in the Fish language, and a comparative analysis was made for the total damage risk index of the surrounding rock under static load and the superposition of static load and dynamic load at N2105 return air roadway. Under the superposition of dynamic and static loads, all damage risk indexes of roadway surrounding rock are larger than that of static load, and the corresponding damage area is skewed to the asymmetric distribution of the active load source side. The anchor rods perpendicular to the roof and the right side of the moving load source are almost all in the damaged danger zone, and the failure of the bolt damage causes the serious strata behaviors. The method of numerical simulation of micro-seismic monitoring and damage risk index can effectively evaluate the supporting system of roadway surrounding rock.