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以宁夏石嘴山西区3号煤层开采为工程背景,借助相似模型试验、得到煤层开采引起的覆岩裂隙动态发育过程以及不整合面附近裂隙发育特点.通过数值模拟计算,得到不整合面附近岩土体位移变形特征.研究发现:开采扰动条件下,不整合面附近由于两侧岩土体材料不同发生变形不协调,致使不整合面两侧发生挤压或开裂现象.开裂区将产生大量离层,为第四系松散含水层向煤系地层进行横向水力补给提供涌水通道.
Taking the mining of No. 3 seam in Shizuishan area of Ningxia as the engineering background, similar dynamic tests of the overlying strata induced by coal seam mining and the development of fractures near the unconformity surface were obtained by the similar model tests. By numerical simulation, The results show that under the conditions of mining disturbance, the deformation and deformation of the rock mass near the unconformity surface are not coordinated, resulting in the extrusion or cracking on both sides of the unconformity area.The delamination area will produce a large number of delamination, It supplies gushing water channel for the horizontal hydraulic replenishment of the Quaternary loose aquifer to the coal measures strata.