School of Energy Science and Engineering,Henan Polytechnic University Henan Provincial Coordinated Innovation
Center for Coal Safety Production Xinzhuang Mine,Henan Shenhuo Coal and Electric Power Company Limited

为了保持深部硐室的长期稳定,降低硐室维修费用,保证矿井的安全生产,以新庄煤矿暗斜井第2部大断面机头硐室为工程背景,采用数值计算研究了大断面硐室顶板卸压巷道的卸压机理。研究结果表明,顶板卸压以后硐室顶底板围岩垂直应力均大幅减小,且底板垂直应力减小的幅度较大;顶板卸压对硐室顶板的扰动较小;卸压以后硐室顶底板和两帮围岩水平应力、水平位移均明显减小,所以顶板卸压效果明显。在此基础上,设计了大断面硐室顶板卸压巷道的参数和卸压区域,并提出了卸压巷道掘出以后,采用定向抛掷爆破法进行顶板区域卸压的施工方法。

In order to keep long stability of deep chamber,reduce the maintenance cost of chamber and ensure the safety production of mine,take the second large par t cross section drive head chamber in blind shaft of Xinzhuang Mine as engineering background,numerical calculation was applied to study pressure- relief mechanism of「 oof pressure- relief roadway for large cross section chamber. The study results showed that after roof pressure- relief,the plumb stress of surrounding rock in roof and floor of chamber was sharply reduced both,but the plumb stress of floor was reduced sharplyer than roof. The roof pressure- relief would have less interference to roof of chamb er.After pressure- relief,the horizontal stress and horizontal displacement of roof, floor and two sides surrounding rock of chamber were obviously reduced and therefore pre ssure- relief effect of roof was obvious. Based on these,the parameters of roof pressure- relief roadway and pressure- relief area of large cross section chamber were desig ned. After pressure- relief roadway driven,directional throw blasting method was applied to the construction method of roof pressure- relief area.

国家自然科学基金资助项目(51574110)；