本文選題：數(shù)值模擬 + 構(gòu)造控水　； 參考：《華北理工大學(xué)》2017年碩士論文

【摘要】：煤礦開采對地下水的影響是一個動態(tài)且持續(xù)的過程,打破了地下水原有的補徑排平衡狀態(tài),使地下水系統(tǒng)變得日益復(fù)雜。煤礦開采形成的采空區(qū)采掘深度不同、大小不同,其頂板的上覆巖層因失去支撐而依次出現(xiàn)冒落、塌陷和斷裂裂隙,形成導(dǎo)水裂隙帶,致使上覆含水層地下水向下部轉(zhuǎn)移,導(dǎo)致礦井涌水,威脅礦井的安全生產(chǎn)。深入分析礦井水文地質(zhì)條件,預(yù)測礦井涌水量對于防止礦井突水、淹井等礦山惡性事故、降低生產(chǎn)成本、保障礦山安全生產(chǎn)具有十分重要意義。以開灤東歡坨礦北二采區(qū)為研究區(qū)域,系統(tǒng)收集了礦井勘查與生產(chǎn)勘探獲得的地質(zhì)與水文地質(zhì)資料,結(jié)合現(xiàn)場調(diào)查,全面分析了北二采區(qū)5煤層開采充水水文地質(zhì)條件。通過對抽水試驗數(shù)據(jù)、鉆孔巖性與厚度、水位、涌水量、地質(zhì)構(gòu)造條件、采動破壞影響等綜合研究,掌握了煤5頂板0~100m充水含水層的補給與邊界條件、含水層非均勻分布儲導(dǎo)水性、8煤層開采導(dǎo)水裂縫帶含水層影響等規(guī)律。運用Visual Modflow數(shù)值模擬軟件,建立了北二采區(qū)主要頂板充水含水層地下水?dāng)?shù)值模型,模擬了北二采區(qū)開采前地下水在長期的流動中形成的穩(wěn)定流狀態(tài),獲得東歡坨礦開懫前的初始水位與水流場。采用排水溝代替多個抽水井的方法實現(xiàn)了礦井采面排水,模擬了北二采區(qū)開采期間非穩(wěn)定流地下水水位變化情況。依據(jù)煤5頂板長觀孔東觀27孔和東觀39孔的觀測數(shù)據(jù)對模型進行了擬合與檢驗,得出兩個長觀孔的歷時擬合曲線和模擬區(qū)的滲透系數(shù)分區(qū)結(jié)果。利用經(jīng)過識別驗證的模型對5煤層開采工作面涌水量進行了模擬預(yù)測。結(jié)果表明:北二采區(qū)煤5以上0~100m強含水層為5、8煤層開采主要直接充水含水層,單位涌水量0.016~1.507L/s.m,滲透系數(shù)0.369~10.492m/d,裂隙非常發(fā)育,富水性強,且強烈不均。接受沖積層補給,水位、涌水量受構(gòu)造影響。構(gòu)造裂隙等導(dǎo)致含水層滲透系數(shù)非均勻性分布,形成六個分區(qū)。通過調(diào)整參數(shù),東觀27孔和東觀39孔水位擬合較好,模擬結(jié)果顯示5煤層開采預(yù)測最大涌水量5852.97m3/d,最小涌水量為1352.1 m3/d。
[Abstract]:The influence of coal mining on groundwater is a dynamic and continuous process, which breaks the original equilibrium state of recharge and discharge of groundwater, and makes the groundwater system become more and more complex. The mining depth of the goaf formed by coal mining is different and the magnitude is different. The overlying strata of the roof appear caving, collapsing and fracture fissures as a result of the loss of support, forming a water-conducting fissure zone, which causes the groundwater of the overlying aquifer to be transferred to the lower part of the overlying aquifer. Causes the mine to gush the water, threatens the mine safe production. Further analysis of mine hydrogeological conditions and prediction of mine water discharge are of great significance in preventing mine water inrush, flooding and other malignant accidents in mines, reducing production costs and ensuring safe production in mines. Taking Bei No. 2 mining area of Donghuantuo Coal Mine in Kailuan as the research area, the geological and hydrogeological data obtained from mine exploration and production exploration are collected systematically. Combined with field investigation, the hydrogeological conditions of water filling in coal seam No. 5 of Bei No. 2 Mining area are comprehensively analyzed. Based on the comprehensive study of pumping test data, borehole lithology and thickness, water level, water inflow, geological structural conditions and the influence of mining failure, the recharge and boundary conditions of 100 m water-filled aquifer with coal 5 roof are mastered. The influence of aquifer on water conductivity fracture zone in non-uniform distribution of aquifer is studied. By using Visual Modflow software, the groundwater numerical model of the main roof filling aquifer in Bei No.2 mining area is established, and the steady flow state of groundwater formed during the long term flow before exploitation in Bei er mining area is simulated. The initial water level and water flow field of Donghuantuo Mine before opening are obtained. The drainage of mining face is realized by using drainage ditch instead of several pumping wells, and the variation of groundwater level of unsteady flow during mining in Bei No.2 mining area is simulated. According to the observation data of 27 holes and 39 holes in the east of coal roof, the model was fitted and tested, and the diachronic fitting curves of the two holes and the partition results of permeability coefficient in the simulated area were obtained. The model verified by identification is used to simulate and predict the water inflow of 5 coal seam mining face. The results show that the strong water-filling aquifer of coal above 5 ~ 100 m in Bei No. 2 mining area is the main direct water-filled aquifer in coal seam No. 5. The unit water inflow is 0.016 ~ 1.507L / s 路m, the permeability coefficient is 0.369 ~ 10.492 m / d, the fissure is very developed, the water-rich is strong, and the water content is strong and unevenness. Accept alluvial bed recharge, water level, gushing water is affected by structure. Structural fissures lead to heterogeneous distribution of aquifer permeability coefficient, forming six subzones. By adjusting the parameters, the water level of Dongguan 27 well and Dongguan 39 hole is fitted well. The simulation results show that the predicted maximum water inflow of coal seam 5 is 5852.97 m3 / d, and the minimum water inflow is 1352.1 m3 / d.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD745;P641

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