Failure characteristics of surrounding rocks in coal seam mining roadway

Abstract

In order to provide technical support for grouting engineering of broken surrounding rock in roadway. Taking a certain mine in Jin coal mine area as a test mine, drilling TV and segmented water injection tests were used to detect the damage characteristics of surrounding rocks, and the numerical simulation of stress characteristics during the failure process was carried out. The research results show that the crack width of the surrounding rock can be reduced to four areas from the inside to the outside, and the crack widths are different. After the excavation of the roadway, the stress concentration occurs inside the coal and rock mass. With the excavation, the stress exceeds the strength of the coal and rock mass, and the failure occurs, and the stress concentration phenomenon continues to develop deep; the radial direction of the roadway is divided into four areas: completely broken zone, fracture reduction zone, fractured compression zone and proto-rock-like area