Study on stress evolution and supporting technology of surrounding rock of the dynamic pressure roadway with combined roof

The roof of No.10 lower coal seam in Sanjiaohe mine is a typical combined roof.From the practice in the mine, the roof of No.10 lower coal seam is not well formed and easy to be weathered and broken.Roadway 10-2032 with combined roof is boring heading for adjacent advancing mining face 10-201, which is difficult to support.Based on the analysis of geological conditions, through numerical simulation, the stress state of roadway 10-2032 before and after mining face is analyzed.Combined with the stress evolution, according to the engineering analogy and numerical simulation results, the bolt and cable supporting design of roadway 10-2032 is given.The roof is supported by a combination of long and short anchor cables, and the roadsides are supported by a single bolt and a W steel plate.The practice has proved that the roadway 10-2032 can still maintain a good supporting effect after it is penetrated in the face of adjacent stoping.