Research of deformation of roadway surrounding rock under effect of high horizontal stress in Gaojiapu Coal Mine

In order to study deformation characteristics of roadway surrounding rock under effect of high horizontal stress in Gaojiapu Coal Mine, geostress of Gaojiapu Coal Mine was measured. The results indicate that Gaojiapu Coal Mine is dominated by horizontal stress. The maximum horizontal principal stress is 38.67 MPa and azimuth angle is 227.30°. Numerical simulation and field test of surrounding rock deformation of two return airways with different angles between roadway axis and the maximum horizontal principal stress direction were conducted. The results show that distribution of plastic zone is near the roadway surrounding and shows oval shaped when angle between the roadway axis and the maximum horizontal principal stress direction is 12°. Plastic zone of roof develops on top corners of the roadway and is similar to square when angle between the roadway axis and the maximum horizontal principal stress direction is 78°. The damage degree of roadway roof and floor is higher than that of two sides, and the larger the angle between the roadway axis and the maximum horizontal principal stress direction, the greater the deformation of surrounding rock.