China National Coal Group Corporation National Key Lab for Deep Geomechanics and Underground
Engineering,China University of Mining and Technology (Beijing) School of Mechanics and Civil Engineering,China
University of Mining and Technology (Bejing) School of Mining Engineering,Heilongiang University of Science and
Technology Yaoqiao Mine Shanghai Datun Energy Company Limited

针对在回采期间由于顶板断裂造成动压,导致姚桥煤矿7521工作面回采巷道严重大变形破坏的现象,分析其产生大变形破坏的特征和原因分析,指出埋深大和坚硬顶板破断时动压影响是造成巷道大变形破坏的2个主要原因。同时提出了采用水力致裂技术对回采巷道坚硬顶板进行应力弱化,进而减小围岩压力,在不增加围岩支护强度的情况下在现场进行了工程试验,结果表明:利用水力致裂技术对坚硬顶板进行应力弱化,可很好地控制回采巷道围岩稳定性,验证了该技术在回采巷道大变形控制中应用的可行性。

According to the dynamic pressure occurred by roof breaking during the mining period,a serious Large deformation failure phenomenon caused in the gatew ay of No. 7521 coal mining face in Yaoqiao Mine. The paper analyzed the features and causes of the Large deformation failure occurred. The paper pointed out that deep d epth and dynamic pressure occurred from hard roof breaking were two main factors to cause Large deformation failure. A hydraulic fracturing technology was provided to th e stress weakening of hard roof above gateway and to reduce pressure of surrounding rock. An engineering test was conducted in the mine site under condition not to incre ase the support intensity of the surrounding rock. The results showed that the application of the hydraulic fracturing technology could make the stress weakening of hard ro of and could well control stability of surrounding rock along gateway. The feasbility of new technology applied to large deformation control of gateway was approved.

国家自然科学基金面上基金资助项目(51404278,51479195)；中央高校基本科研业务费专项资金资助项目(2011QL07)；