The Law Of Ground Pressure And Itself Supporting Of The Lane That The Narrow And Small Pillar Protected

The DaShuiTou coal mine of the QinYuan company is one of the big coal mine in the GanSu , it used the technical of the coal pillar protected the entrys. The coal layout is high gas , soft and flammability . With the needs of the coal market ,it is required the coal mine decreasing the loss rate and increasing the recovery rate . It is must waste the coal resource that left 20-30m coal pillar . So it is became the new problem that decrease the dimension of pillar reasonably, made the pillar not only can brace the ground pressure but also prevent the water and gas into the work-face. The last I-steal support pattern is not satiety the demand of supports and must search out a new support pattern . The paper spread out the study at this background basing on the mine's geological feature, lending other mine's outcome and incorporating analysis of theory and observation of work-face.The paper adopted the study way that the theoretical analysis connective with the field observation . First analyzed from the ideally and advanced it is reasonably and feasibility that left 5-7m coal pillar . At the support pattern ,it advanced that the pattern of machines and tools used for bolting and shotcrete lining can control the pillar's deformation better than the support pattern of I-steal before compared each other's feature. The same it advanced the propose of improved the supports materials intension. Combined the transmutation of the lane in the course of circle pick and hypo-second supports, it advanced that the validity of the anchor netting hypo-second supports and the betimes intensify supports of anchor netting. At last it advanced that left 5-7m coal pillar not only feasibility , but also elevate the economical benefits.The study's success not only increase the service years of the coal mine ,but also but also elevate the economical benefits of the society . The same, it proved the practice foundation for...