沿空留巷复合底板底臌技术原因与防治对策

复合底板条件下沿空留巷底臌不仅与岩层组成等自然因素有关,还与巷道开挖卸压、工作面超前支护加压、超前支护撤除卸压的反复作用有关。压力的反复作用导致岩体内部裂隙增加,整体发生破坏,进而在巷旁支护高压力作用下底板发生滑移。文中从技术影响与控制的角度出发,提出了＂减少底板反复扰动、弱化巷旁支护传力效果、加强巷旁底板支护＂的防治原则。实测结果表明：在复合底板底臌防治中,将技术原因考虑其中,可以提高防治效果。该研究对同类底板条件下沿空留巷底臌的防治具有一定的借鉴意义。

Technology reason and control countermeasures of compound bottom rock bulging in retaining laneways along stope boundary

Rock bulging occurring in retaining laneways along stope as in the case of compound bottom rock is related not only to the natural causes consisting of rock composition,but also to repeated action due to pressure release after digging,greater pressure coming from face advance support,and less pressure coming from advance support removal.The repeated action of pressure lead to increasing fracture inside rocks and the destruction of the whole configuration,with the consequent floor slippage under high stress of boundary support.From the angle of technology influence and control,this paper proposes prevention and control measures designed for reducing repeated disturbance on bottom rock,weakening transmission effect of the boundary support stress,and strengthening the support on bottom rock under boundary support.The application shows that the consideration of technology reason in preventing and controlling compound bottom rock bulging results in a better control effect.The study is of a certain significance to preventing and controlling bottom rock bulging occurring in retaining laneway along stope under the same condition.