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以河东煤田南部某深部开采煤矿为研究对象,利用室内相似模拟实验的方法,对大埋深条件下的上位煤开采引起的地表二次沉降规律做了研究。在下位煤采动结束压实稳定后,对上位煤进行开采。由于煤层群整体埋藏较深,二次开采后,上覆岩层的变形移动较大,在采空区上方接近地表处出现了离层,模型2个边界处产生较大的倾斜裂隙,地表有明显的二次下沉,表现为完整的下沉盆地。
Taking a deep mining coalmine in the south of Hedong coalfield as the research object, this paper studied the law of surface subsidence caused by the upper coal mining under the condition of deep buried depth using the indoor analog simulation method. After the next coal mining compaction stability, the upper coal mining. Due to the deep burial of the whole coal seam group, the deformation of the overlying strata moves more after secondary mining. There is a delamination near the surface at the top of the goaf. Large oblique cracks occur at the two boundary of the model with obvious surface The second sinking, manifested as a complete sinking basin.