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以山西某煤矿承压水体上下组煤开采为工程背景,通过对煤层底板岩石进行全应力-应变渗透性试验及单裂隙渗透性试验,揭示了岩石应力-渗流耦合机理,获得了断裂面渗透系数的定量关系式;采用离散元流固耦合模拟方法,对承压水体上煤层开采底板岩层的应力状态及渗流特征进行模拟分析.结果表明:底板岩层“四带”中的渗透性均与水平应力密切相关,其中:直接底板受工作面矿压影响严重,岩层中的水平应力杂乱无章,破坏带厚度约13m;奥灰含水层顶部岩层为低围压区,容易形成奥灰水楔劈裂导升机理,导升带厚度为17m左右;底板中部层位受采动矿压及底板承压水直接影响相对较小,此带中水平应力自上而下呈递增状态,有效隔水层带厚度38m,是底板的关键阻水层.
Taking the coal mining of the upper and lower coal bearing strata in a coal mine in Shanxi Province as the engineering background, the stress and seepage coupling mechanism of the rock was revealed through full stress-strain permeability tests and single-fracture permeability tests on the coal seam floor rock. The permeability coefficient The results show that the permeability of the floor rock strata in the “four-zone” of the strata is similar to that of the “four zones” Horizontal stress is closely related to each other, of which: the direct floor is seriously affected by the mine pressure, the horizontal stress in the rock formation is disorganized and the thickness of the damaged zone is about 13m; the top rock formation of the Ordovician gray aquifer is a low confining pressure zone, Guide mechanism, the thickness of the guide belt is about 17m. The middle layer of the bottom plate is directly affected by the mining pressure and the pressure water of the bottom plate. The horizontal stress in this belt is in an increasing state from top to bottom, and the effective aquitard Thickness of 38m, is the key to the floor of the water block.