关键词: 浅埋煤层, 大采高综采, 物理模拟实验, 声发射, 模型支架监测系统

Abstract: According to conditions of No.5-2 super-thick coal seam in Zhangjiamao coal district of Yushen mining area, the physical and mechanical properties of coal-rock masses were measured by lab mechanics experiments. The physical simulation model was built up, and the mechanical properties of support were simulated．The simulation results indicate that the strata behavior of large mining height fully mechnized face is dramatic．Meanwhile, the deformation and damage of rock masses with the excavation were monitored by the acoustic emission (AE) and support pressure monitoring, and the strata movement and evolution of abutment pressure during roof weighting were analyzed．The results also show that the wave variation from AE is remarkable with abutment pressure change, and the maximum events are reached to 2578 per min．The step of periodical weighing is about 15.0 meters, the advanced abutment pressure zones range from 10.0 to 13.0 meters ahead of the workingface, and the peak pressure moves toward the direction of mined-out area．Moreover, the support with the rated working resistance of 12 000 kN can satisfy the efficient and safe excavation of the coal seam.

Key words: shallow buried coal seam, large height fully mechanized mining, physical simulation experiment, acoustic emission (AE), support pressure monitoring system