China National Coal Group Corporation Limited China National Coal Datun Coal and Electric Power Company
Limited

为解决大屯矿区姚桥煤矿深部回采巷道支护难度大、返修率和失效比例大的问题,通过理论分析和现场调研可知回采巷道埋藏深度大、岩性软弱破碎、受四周采动影响频繁是变形量较大的原因,原有支护方式难以适应深部巷道围岩稳定性控制的要求,在此基础上"强化支护"和"适度让压"相统一的新型锚网索耦合支护设计方案,现场应用结果表明:掘进期间两帮最大移近量仅为127 mm,顶板最大下沉量为43 mm,最大底鼓量为42 mm,巷道变形在回采期间主要以底鼓为主,最大底鼓量达到112 mm,为两帮移近量的2倍左右。回采支承压力影响范围为180~200 m,严重影响区域为80~100 m,验证了采用高强锚网索耦合支护系统在控制顶底及两帮变形方面效果明显。

In order to solve the support difficulty,high repair rate and high failure ratio problems of the mining roadway in the deep section of Yaoqiao Mine,Datun Minin g Area,with the theoretical analysis and the site investigation,the great deep depth of the mining roadway,the soft,weak and broken lithology and frequent surrounding neig hbor mining influences would be the major causes of the large deformation occurred.The previous support method was hard to meet the stability control requirements of th e surrounding rock along the deep roadway.Based on the circumstances,a new bolt-mesh-anchor coupling support design plan with an integration of an " intensified suppor t" and "proper yielding" was provided.The site application results showed that during the roadway driving period,a max convergence of the two sidewalls was 127 mm only, a max subsidence of the roof was 43 mm and the max floor heave was 42 mm. During the mining period,the floor heave of the roadway was mainly occurred,the max floor heave was 112 mm and was about two times higher than the convergence of the two sidewalls.The influence scope of the mining support pressure was ranging from 180 ~ 200 m,the serious influence area was 80 ~ 100 m and the obvious effect to control the roof-floor and the two sidewalls deform ation with the obuous bolt-mesh-anchor coup ling support system was verified.

国家自然科学基金重点资助项目(51134025)；