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针对高应力综放工作面瓦斯尾巷围岩稳定性控制难题,综合运用理论分析、数值模拟及现场实测的方法分析围岩变形破坏特征。结果表明:在非采动影响期间,巷道两帮塑性区不断向深部发展是引起顶沉和底鼓的根源;受采动影响时,缺乏超前支护是片帮垮顶的主因。据此提出“支顶-控底-助帮”支护理论及技术,即:在尾巷内布设1排混凝土支柱,给顶板强有力地支撑,并将顶板压力传递至底板以控制底鼓,继而减轻两帮载荷,阻止两帮塑性区向深部扩展;同时,对尾巷起超前支护作用。
Aiming at the problem of stability control of surrounding rock of gas tailrace in high stress fully mechanized caving face, the deformation and failure characteristics of surrounding rock are analyzed synthetically by means of theoretical analysis, numerical simulation and field measurement. The results show that during the non-mining period, the deep development of the two plastic zones in the roadway is the root cause of the top and bottom drums. When mining is affected, the lack of advance support is the main cause of the roof collapse. Based on this, the author puts forward the theory and technology of “support-top-control-support”, that is, laying a row of concrete pillars in the tail lane to support the roof strongly, and transmitting the roof pressure to the floor to control the bottom Drum, and then reduce the load of two to prevent the two plastic zone to the deep expansion; the same time, play a leading role in the tail lane.