Research on the Quantitative Relationship between Stress Shadow Effect of Multiple Thick and Hard Key Layers and Surface Subsidence

The treatment of surface structures such as villages and rivers that are affected by underground coal mining has long been a hot and difficult issue faced by coal mining, such as building cracking, foundation sinking, and even water body rupture and loss. With the further improvement of environmental protection requirements, some underground coal mines that do not have the conditions for filling and grouting are difficult to ensure the recovery of coal resources and control surface subsidence at the same time. In addition, a large number of common problems have emerged in the Yushen, Binchang mining areas, and some coal fields in Shanxi, seriously restricting the development of coal energy and environmental protection work. Through numerical simulation experiments and mechanical model theoretical calculations, the artificial buffer layer overlying rock structure control technology was proposed, and the stress and displacement evolution laws of various landmark rock layers under different mining method conditions were explored. Finally, it was concluded that choosing LCMTC for artificial buffer layer overlying rock structure control technology can effectively reduce the degree of surface overlying rock movement and improve the theoretical system of rock layer control, Provided theoretical guidance and mechanism explanation for on-site construction.