煤矿保护层开采覆岩破断移动特征研究

Research on the Fracture Movement Characteristics of Overlying Strata in Coal Mine Protection Layer

煤矿开采造成覆岩破坏时有发生,给工程设计及施工带来了挑战。湖南龙琅高速公路某隧道通过长冲煤矿采空区,地质构造复杂,施工中存在采空区塌陷问题。为保障隧道的安全,运用关键层理论研究被保护层裂隙发育规律,对煤矿保护层开采覆岩破断移动特征进行了研究,揭示了采空区形态规律,预计了隧道开挖引发岩层移动量,分析了其稳定性,为建立隧洞穿越采空区围岩扰动分析模型及结构安全分析提供理论依据。

Overlying rock damage caused by coal mining occurs from time to time, which brings challenges to engineering design and construction. The Anping Tunnel of Hunan Longlang Expressway passes through the goaf of Changchong Coal Mine. The geological structure is complex, and there is a problem of subsidence in the goaf during construction. In order to ensure the safety of the tunnel, starting from the analysis of overlying layer separation, fracture failure and deformation of the long-distance protective layer mining, the deformation characteristics of the long-distance protected layer are discussed, and the key layer theory is used to study the crack development law of the protected layer. The characteristics of the breakage movement of the mining overburden were studied, the morphology of the mined-out area was revealed, the amount of rock movement caused by the tunnel excavation was predicted, and its stability was analyzed, in order to establish a tunnel crossing the mined-out area surrounding rock disturbance analysis model and structural safety analysis Provide theoretical basis.