Non-Sufficient Control Method and Application of Surrounding Rock in Return Laneway of Shallow Coal Seam

The end of the large mining height working face in the northern Shaanxi area is easy to form a triangular suspended roof area, which leads to the accumulation of harmful gases in the working face, and a large area of triangular suspended roof seriously threatens the safe production of the mine. In view of this problem, based on the geological conditions of 20202 working face in Longhua Coal Mine, the influence of bolt density and advance support on the deformation characteristics of surrounding rock was analyzed by UDEC and 3DEC numerical simulation methods. Combined with the characteristics of shallow coal seam, the non-sufficient control method of roadway surrounding rock is put forward by making full use of the self-bearing effect of surrounding rock. While ensuring the support quality and efficiency, the number of bolts and the support density are reduced, so as to reduce the risk of large area hanging roof at the end. Good results have been achieved in engineering applications. The results show that: The deformation of the roof and floor of the roadway and the two sides are within a reasonable range, and the quality of the roadway support meets the production conditions; reducing the number of bolts at the top of the roadway can effectively improve the efficiency of roadway excavation; the non-sufficient control method of roadway surrounding rock solves the problem of large area hanging roof in the triangle area of roadway end, which has positive significance for the control of roadway surrounding rock in shallow coal seam working face.