Surrounding Rock Control Technology for Ultra-high Area in Crossheading of Fully Mechanized Mining Face

Taking the 22315 working face passing through the roadway ultra-high area in Halagou Coal Mine as the engineering background, methods of theoretical analysis, numerical simulation, and industrial testing are adopted to study the stability control method for surrounding rock. The research results show that as the distance between the ultra-high roadway area and the working face gradually shortens, the stress distribution of the roadway surrounding rock gradually evolves from a symmetrical shape to a "solitary peak type" distribution, and the "solitary peak" phenomenon exhibits a trend of transferring from the coal wall front side to the secondary side. In the roadway ultra-high area, strong force anchor cables are adopted to conduct reinforcement and support, supplemented by the anchor cable suspension beam false roof construction of "wooden stack skeleton+flexible mold bag filling body", effectively filling is conducted on the ultra-high area. Through the engineering actual measurement, it is found that there has no occurrence of significant subsidence of the roadway surrounding rock roof in this ultra-high area, successfully ensuring the stability of the roadway surrounding rock and providing reference experience for similar engineerings.