下保护层的开采必然引起采空区上覆岩层的移动和破坏,覆岩的运动为被保护层的卸压提供了空间,也为被保护层的瓦斯解吸和运移提供了通道。采用UDEC软件,模拟保护层开采,得出了采空区上覆岩层的运动规律和破坏特征,对于指导工程实践具有重要意义。 The mining of the lower protective layer inevitably causes the movement and destruction of the overlying strata in the goaf. The movement of the overburden provides space for the pressure relief of the protective layer and also provides a channel for gas desorption and migration of the protective layer. UDEC software was used to simulate the mining of protective layer, and the law of motion and failure characteristics of overlying strata in goaf were obtained, which is of great significance for guiding engineering practice.