唐家会煤矿61101工作面水害防治分析研究

发布时间：2018-09-09 17:06

【摘要】：煤炭是我国现代化经济建设最重要的能源之一,在我国经济建设占据着重要的地位。而煤矿水害一直是威胁煤矿安全生产的重要原因之一,而承压水上采煤导致的水害占整个矿井水害一半以上。唐家会煤矿主采煤层为6煤,61101工作面为矿井首采工作面,工作面开采面临顶板砂岩水、底板奥灰水、断层裂隙水及废弃巷道采空区积水综合作用下回采安全问题。而对水害分析研究的技术尚不完善,因此,对唐家会61101工作面防治水分析研究及安全性评价是很有必要的。本文以唐家会煤矿61101工作面作为水害防治研究的工程背景,分析了煤层采动底板破坏及水害防治方法,并且作了安全性评价。研究内容取得如下成果在:1、通过对61101工作面水文地质条件的勘察,以及钻探资料的分析,并且进行了物探与钻探探查方法设计,作了进一步分析研究。获得了奥灰含水层的富水性特征,底板岩层的阻隔水性能力、厚度及裂隙变化,还有工作面构造发育形态等情况。2、以唐家会煤矿DF11断层周边开采为工程背景,构建了工程地质模型,并对突水危险性流固耦合模拟研究。通过对不同落差(5m、10m、15m、和20m)以及不同推进距离(30m、90m、120m、150m、210m)采用模拟软件FLAC3D对DF11不同倾角断层、不同破碎带宽度断层等影响因素进行分析,研究开采过程中覆岩应力变化特征、覆岩破坏规律以及断层的活化、渗流特征。模拟结果表明:(1)随着工作面离断层的距离越来越近,覆岩所受的剪应力和垂向应力逐渐增大,但含水层水压相对稳定,变化较小。(2)随着断层倾角的增大,覆岩中所受到的垂向应力越来越大,而随着断层倾角的增大,覆岩所受的剪应力反而越来越小;断层带内所受的正应力随着工作面的推进逐渐增大,同时随着断层倾角的增大逐渐增大;断层界面的垂向位移随着断层倾角增大而增大,在距离不变的情况下,工作面推进至断层时,同一标高处上盘界面的滑移量大于下盘界面的滑移量;在距离相同时,煤柱及底板的塑性破坏范围是随着断层倾角减小而增大,可以得出在其他情况相同条件下,覆岩煤柱顶及底板孔隙中的压力是随着断层倾角减小而增大,在距离不变的情况下,工作面推进至断层,地下水流的流速会逐渐增大,也就是说留设的煤柱宽度是随着渗水危险性增大而增大的。(3)在距离不变的情况下,覆岩中的剪应力和覆岩中的垂向应力以及断层中受到的正应力都是随着破碎带宽度增大而增大;断层中上盘界面的滑移量受破碎宽度带作用越大,与之越大。上盘界面的滑移量大于下盘界面的滑移量,其影响范围及程度也会增大;可以得出在其他情况相同条件下,覆岩煤柱顶及底板孔隙中的压力是随着断层倾角减小而增大,在距离不变的情况下,工作面推进至断层,地下水流的流速会逐渐增大,也就是说留设的煤柱宽度是随着渗水危险性增大而增大的。3、进行了61101首采工作面安全回采水害影响因素分析,利用导水裂隙带经验公式、突水系数公式分别对带压开采时顶板砂岩水、底板奥灰水危险性程度进行了初步评价,计算结果如下:(1)导水裂隙带高度Hf为227m,所以4煤顶板砂岩及6煤顶板砂岩含水层是首采面顶板充水含水层;(2)突水系数Ts在0.0263~0.0318 MPa/m,小于临界突水系数0.06 MPa/m,所以在底板隔水层完整的情况下,奥灰水突水的可能性很小。4、进行了工作面涌水量、矿井涌水量预计,并结合周边矿井防治水经验,确定了矿井排水能力,为矿井水害防治提供了方法和对策。论文的研究成果,可为唐家会煤矿首采工作面实现安全生产提供了技术支撑。
[Abstract]:Coal is one of the most important energy sources in China's modern economic construction and occupies an important position in China's economic construction. Coal mine water hazard has always been one of the important reasons threatening the safety of coal mine production. Water hazard caused by mining on confined water accounts for more than half of the whole mine water hazard. In the first mining face of the mine, the mining face faces the safety problems under the combined action of roof sandstone water, floor Ordovician limestone water, fault fissure water and goaf water in abandoned roadway. However, the technology of water hazard analysis is not perfect, so it is necessary to analyze and evaluate the water prevention and control in the 61101 working face of Tangjiahui. Taking 61101 working face of Tangjiahui Coal Mine as the engineering background of water disaster prevention and control research, this paper analyzes the methods of floor damage and water disaster prevention and control in coal seam mining, and makes safety evaluation. The following achievements have been obtained in the study: 1. Through the investigation of hydrogeological conditions in 61101 working face and the analysis of drilling data, geophysical exploration and drilling have been carried out. The water-rich characteristics of the Ordovician limestone aquifer, the water-barrier capacity of the floor rock, the variation of thickness and fissures, and the structural development of the working face are obtained. 2. Taking the mining around the DF11 fault in Tangjiahui Coal Mine as the engineering background, the engineering geological model is constructed and the risk of water inrush is analyzed. Fluid-solid coupling simulation research. By using FLAC3D simulation software to analyze the influence factors of DF11 fault with different dip angle and different fracture bandwidth, such as different drop (5m, 10m, 15m, 20m) and different propulsion distance (30m, 90m, 120m, 150m, 210m), the stress variation characteristics of overburden rock, failure law of overburden rock and fault characteristics during mining are studied. The simulation results show that: (1) with the working face getting closer to the fault, the shear stress and vertical stress of overburden rock increase gradually, but the water pressure of aquifer is relatively stable and changes little. (2) With the increase of the dip angle of fault, the vertical stress of overburden rock increases, but with the increase of the dip angle of fault, the vertical stress of overburden rock increases. On the contrary, the shear stress is getting smaller and smaller; the normal stress in the fault zone increases gradually with the advancing of the working face, and increases gradually with the increasing of the dip angle of the fault; the vertical displacement of the fault interface increases with the increasing of the dip angle of the fault; when the distance is constant, when the working face advances to the fault, the upper wall interface at the same elevation The slip is greater than the slip of the interface of the footwall; when the distance is the same, the plastic failure range of the coal pillar and the floor increases with the decrease of the dip angle of the fault. It can be concluded that under the same other conditions, the pressure in the pore of the roof and the floor of the overburden coal pillar increases with the decrease of the dip angle of the fault, and the working face advances with the distance unchanged. The velocity of groundwater flow increases gradually with the increase of seepage risk. (3) The shear stress in overburden rock, the vertical stress in overburden rock and the normal stress in fault increase with the increase of fracture bandwidth, and the width of coal pillar increases with the increase of seepage risk. The slip of the upper wall interface is larger than that of the lower wall interface, and its influence range and degree will also increase. It can be concluded that under the same other conditions, the pressure in the pore of the roof and floor of overburden coal pillar increases with the decrease of the dip angle of the fault, while the distance remains unchanged. The velocity of groundwater flow will increase gradually when the working face is pushed to the fault, that is to say, the width of coal pillar will increase with the increase of seepage danger. 3. The influencing factors of water disaster in 61101 first mining face are analyzed. The empirical formula of water conduction fracture zone and the formula of water inrush coefficient are used to analyze the roof sandstone water in pressure mining. The dangerous degree of Ordovician limestone water in the floor is preliminarily evaluated, and the results are as follows: (1) The height of water-conducting fracture zone Hf is 227m, so the sandstone aquifer of No. 4 coal roof and No. 6 coal roof is the water-filled aquifer of the first mining face roof; (2) The water inrush coefficient Ts is 0.0263-0.0318 MPa/m, less than the critical water inrush coefficient 0.06 MPa/m, so it is complete in the floor water-proof layer. Under the circumstance, the possibility of water inrush from Ordovician limestone water is very small. 4. The water inrush from working face and mine are predicted, and the drainage capacity of mine is determined according to the experience of surrounding mine water prevention and control. The research results of this paper can provide the technology for realizing safe production in the first mining face of Tangjiahui Coal Mine. Support.
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD745

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