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针对中国华北型煤田煤系地层底板下伏奥陶系巨厚层灰岩含水层水压高,动、静贮量丰富,是构成矿井深部开采主要充水水源的实际现状,选择具有较好的过水能力、可能形成底板奥灰水突出通道的开滦矿业集团范各庄矿F0断层为研究对象,采用蠕变力学试验方法,取得了用于数值仿真计算的F0断层物质力学参数,运用FLAC3D数值仿真软件,对受断裂影响的采矿活动进行了流—固耦合模拟和渗流蠕变计算.研究结果表明:煤层顶板岩层受采动影响的影响带范围在断层两侧发育明显,上盘岩层的位移量偏小,下盘岩层的位移量偏大;底板岩层垂直位移量上盘岩层的位移量偏大,下盘岩层的位移量偏小,顶底板岩层垂直位移量在断层附近最大.断裂构造的切割作用使得底板在承受较大构造应力的情况下存在大范围的剪应力区,断裂破碎带的应力集中有是造成底板破坏、发生底板突水的关键.该研究成果对于有效预防断裂滞后突水具有一定指导意义.
In view of the fact that the aquifers of the Ordovician giant thick limestone aquifer under the basement of coal measures strata in North China type coalfield are of high water pressure, abundant dynamic and static reserves and are the actual status quo of the main water source for deep mining, F0 fault of Fangezhuang Mine of Kailuan Mining Group, which may form a prominent passageway for the raw water of Ordovician limestone, was studied. The creep mechanics test method was used to obtain the mechanical parameters of F0 fault material for numerical simulation. FLAC3D Numerical simulation software is used to calculate the fluid-solid coupling simulation and seepage creep of the mining activities affected by the fracture.The results show that the influence zone of coal seam roof affected by mining is obviously developed on both sides of the fault, The amount of displacement is small and the displacement of footwall rock is too large. The amount of vertical displacement of bottom rock strata is too large, and the displacement of footwall rock is too small. The vertical displacement of top and bottom rock strata is the largest near the fault. Of the cutting effect makes the bottom plate in the case of large structural stress under the existence of a wide range of shear stress zone, the stress concentration fracture rupture zone is caused by the destruction of the floor, the occurrence of floor Key water. The research for the effective prevention of fracture water bursting lag has some significance.