Exploration and optimization of surrounding rock control technology of middle roadway in fully mechanized top coal caving face

in order to solve the problems of roadway pressure concentration and maintenance difficulty within the influence range of dynamic pressure in the middle roadway of 22071 fully mechanized top coal caving face in Zaoyuan coal industry, the mine adopts the method of comparative analysis of engineering practice to explore and optimize the surrounding rock control technology within the influence range of dynamic pressure in the middle roadway, The results show that the combined support technology of bolt, mesh and cable active support and advanced shed replacement combined with advanced hydraulic support can effectively reduce the deformation rate of surrounding rock within the influence range of dynamic pressure of the middle roadway. Compared with π steel beam combined with single column passive support, the deformation rate of surrounding rock is reduced from 150mm / D to 40mm / D, and the amount of roadway maintenance is reduced by nearly two-thirds, which meets the needs of safe and efficient production of the mine.