【摘要】：鄂爾多斯盆地賦存豐富的煤炭資源,但受成巖過程及后期構造影響,侏羅系煤層頂板砂巖裂隙-孔隙水分布與賦存具有不均勻性,對回采過程產(chǎn)生一定的威脅。為此,研究其水文地質特征、評價其疏放性及模擬回采過程中滲流場變化特征對礦井水害防治具有一定的指導意義。 本文在查閱國內外相關文獻的基礎上,以東勝礦區(qū)的泊江海子礦為例,系統(tǒng)分析了地質及水文地質條件,重點研究了113101首采面3-1煤層頂板侏羅系中統(tǒng)含水層在疏放下條件下的水量、水位動態(tài)變化特征,并建立了水文地質概念模型和孔隙-裂隙三維非穩(wěn)定流數(shù)學模型,經(jīng)識別和驗證后,獲得了研究區(qū)的水文地質參數(shù)。利用上述模型,模擬首采面在回采過程中的侏羅系中統(tǒng)地下水位下降形成疏干漏斗的演化過程,并間接計算了涌水量,經(jīng)與“大井法”對比發(fā)現(xiàn)兩種預測結果較為接近。 此外,從含水層地下水位、水量隨時間變化角度評價工作面疏放水效果,并采用檢驗單孔出水量進行驗證,同時利用流量變化率及疏放率評價局部疏放效果,可看出顯著的疏放水效果減輕了工作面回采時受到的水害威脅的壓力,因而具有十分重要的現(xiàn)實意義。
[Abstract]:There are abundant coal resources in Ordos Basin, but under the influence of diagenetic process and late stage structure, the distribution and occurrence of fracture-pore water in Jurassic coal seam roof sandstone are not uniform, which threaten the mining process to a certain extent. Therefore, the study of its hydrogeological characteristics, the evaluation of its sparsity and the change characteristics of seepage field in the process of simulated recovery are of guiding significance to the prevention and control of mine water hazards. Taking Bojiang Haizi Mine in Dongsheng Mining area as an example, the geological and hydrogeological conditions are systematically analyzed on the basis of consulting relevant literatures at home and abroad. The dynamic variation characteristics of water volume and water level in the middle Jurassic aquifer under the condition of sparse setting are studied in this paper, and the hydrogeological conceptual model and the mathematical model of pore-fracture three-dimensional unsteady flow are established. After identification and verification, the hydrogeological parameters of the study area are obtained. Using the above-mentioned model, the evolution process of the dewatering funnel formed by the drop of groundwater level in the middle Jurassic system during the recovery of the first mining face is simulated, and the water inflow is indirectly calculated. The comparison between the two prediction results and the "large well method" shows that the two kinds of prediction results are close to each other. In addition, the drainage effect of working face is evaluated from the point of view of groundwater level and water volume changing with time, and verified by checking the single hole water output, and the local drainage effect is evaluated by using the rate of change of discharge and the rate of drainage. It can be seen that the obvious effect of drainage can reduce the pressure of water damage in face mining, so it has very important practical significance.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P641.4

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