露天和地下联合开采要解决的主要问题之一是,在地下采空区上部岩层移动和局部冒落区域内进行露天开采要保证安全。目前,岩层移动和局部冒落机理的研究在预报地表发生危险移动和形成地表塌陷方面,还未达到十分准确和可靠的程度。因此,为了在地下采空区上部能安全进行露天开采,必 One of the major problems to be solved by combined open-pit and underground mining is that safety is to be ensured by the open pit mining in the area above the ground mined area where the rock formation is moving and where the area is locally located. At present, the study on the mechanism of rock movement and local caving has not yet reached a very accurate and reliable level in predicting the dangerous movement of the ground surface and the formation of surface subsidence. Therefore, in order to be able to safely conduct open-pit mining in the upper part of the underground gob,