【摘要】：膏體充填開采是“三下”開采的重要采煤方法之一,是實現(xiàn)安全解放水體下在壓煤炭資源的重要措施。目前,對水體下膏體充填開采導(dǎo)水裂縫帶發(fā)育規(guī)律的研究還存在諸多問題,值得進一步深入研究。本文采用理論分析、數(shù)值模擬、現(xiàn)場實測等方法對膏體充填開采覆巖運動與破壞規(guī)律進行研究,著重分析導(dǎo)水裂縫帶的發(fā)育規(guī)律,得出導(dǎo)水裂縫帶的計算方法。論文得出如下成果。(1)對比垮落法開采,研究分析膏體充填開采覆巖運動規(guī)律,得出:膏體充填開采充填體對覆巖產(chǎn)生支撐作用,對覆巖的下沉和破壞起到限制作用,改變了覆巖原有的移動破壞形式。覆巖破壞一般只產(chǎn)生小范圍的裂縫帶,不產(chǎn)生垮落帶。頂板已無直接頂和基本頂?shù)母拍睢?2)在研究膏體充填開采覆巖運動破壞規(guī)律的基礎(chǔ)上,基于等效采高模型,采用兩段弧原理簡化覆巖下沉盆地的邊緣線,建立幾何模型,通過模型中的幾何關(guān)系推導(dǎo)出膏體充填開采導(dǎo)水裂縫帶的發(fā)育高度計算公式。(3)基于等效采高,通過數(shù)值模擬對膏體充填開采塑性區(qū)的分布規(guī)律加以研究,分析覆巖運動破壞規(guī)律,得出不同等效采高,所引起的帶水裂縫帶發(fā)育高度。擬合各組數(shù)據(jù),得出等效采高與導(dǎo)水裂縫帶的關(guān)系公式。(4)介紹工作面的充填概況,以此為工程背景,通過幾何模型與數(shù)值模擬公式預(yù)測導(dǎo)水裂縫帶的發(fā)育高度,分別為4.37m、4.51m。(5)采用井下仰孔分段注水對工作面導(dǎo)水裂縫帶進行觀測,對各個鉆孔進行漏失量分析,得出膏體充填開采,采高2.2m,導(dǎo)水裂縫帶最大發(fā)育高度為4.16m。(6)對比分析幾何模型、數(shù)值模擬擬合式預(yù)測結(jié)果及實測結(jié)果,得出:幾何模型預(yù)測結(jié)果與數(shù)值模擬擬合公式預(yù)測結(jié)果均比實測結(jié)果略微偏大,但誤差較小,三者較為接近。證明幾何模型預(yù)測結(jié)果準確可靠。
[Abstract]:Paste filling mining is one of the important coal mining methods of "three lower" mining, and it is also an important measure to realize the safe liberation of coal resources under pressure under the water body. At present, there are still many problems in the study of the development law of the water diversion fracture zone in the gypsum filling mining under the water body, which is worthy of further study. In this paper, theoretical analysis, numerical simulation and field measurement are used to study the movement and failure law of overburden rock in gypsum filling mining. The development law of water diversion fracture zone is emphatically analyzed, and the calculation method of water diversion fracture zone is obtained. The results are as follows: (1) compared with caving mining, the movement rule of overlying rock in gypsum filling mining is studied and analyzed, and it is concluded that the filling body in gypsum filling mining has a supporting effect on overlying rock, and it limits the subsidence and destruction of overlying rock. The original moving failure form of overlying rock has been changed. Overburden rock failure generally only produces a small range of fracture zone, does not produce collapse zone. The concepts of direct roof and basic roof are no longer existed in roof. (2) on the basis of studying the failure law of overlying rock movement in gypsum filling mining, based on the equivalent mining height model, the edge line of overlying subsidence basin is simplified by using two-stage arc principle, and the geometric model is established. Based on the geometric relationship in the model, the formula for calculating the development height of water diversion fracture zone in gypsum filling mining is derived. (3) based on the equivalent mining height, the distribution law of plastic zone in gypsum filling mining is studied by numerical simulation. The failure law of overlying rock movement is analyzed, and the development height of water fracture zone caused by different equivalent mining heights is obtained. By fitting the data of each group, the formula of the relationship between the equivalent mining height and the water diversion fracture zone is obtained. (4) the general situation of the filling of the working face is introduced, taking this as the engineering background, the development height of the water diversion fracture zone is predicted by the geometric model and the numerical simulation formula. 4.37m, 4.51m. (5) the water conduction fracture zone on the working surface is observed by sublevel water injection with downhole uphole, and the leakage amount of each borehole is analyzed, and the conclusion is that the paste filling mining, the recovery height is 2.2 m, The maximum development height of the water-conducting fracture zone is 4.16 m. (6) the geometric model is compared and analyzed, and the predicted and measured results are simulated by numerical simulation. The results show that the prediction results of geometric model and numerical simulation formula are slightly larger than the measured results, but the errors are smaller, and the three models are close to each other. It is proved that the prediction results of geometric model are accurate and reliable.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD823.7

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