Investigation on the characteristics of excavation damaged zone and numerical simulation of contributing facotrs

Based on the analytical solution of excavation damaged zone in traditional circular roadway, the distribution characteristics of excavation damaged zone are further deduced.The relationship between excavation damaged zone and the roadway section, the lateral pressure coefficient and the depth of the roadway is analyzed.Also, the stability of surrounding rock is evaluated.The results show that the cross section of the roadway has little effect on the variation of excavation damaged zone of the surrounding rock.When the lateral pressure coefficient is less than 1.0, both sides of the roadway are prone to destabilized damage.When the lateral pressure coefficient is equal to 1.0, the excavation damaged zone of the surrounding rock is the most stable and the roadway is in a relatively stable state.When the lateral pressure coefficient is more than 1.0, the roof and floor of the roadway are prone to destabilized damage.The range of surrounding rock excavation damaged zone increases linearly with the increase of depth.When the depth is 1 500 m, the surrounding rock reaches the ultimate strength, so that there is a limit for buried depth in roadway excavation.