富水覆岩特厚煤层综放开采导水裂隙带高度研究

发布时间：2019-04-27 18:18

【摘要】：对于特厚煤层综放开采条件下上覆岩层的破坏特点国内外研究较少，而上覆岩层的运动、破断直接涉及到导水裂隙带发育高度，能使位于开采范围内的地表水、地下水溃入井下，威胁着井下作业的安全。因此，研究特厚煤层上覆岩层的移动和破坏规律具有重要的经济效益和社会意义。本文针对彬长矿区胡家河煤矿工程地质条件，利用物理相似模拟试验方法对不同采高条件下（10m、8m、6m），综放开采过程进行了研究，分析了上覆岩层采动过程中岩体运移规律和裂隙扩展规律，导水裂隙带发展高度约为采高的14～18倍，从而确定合理的开采高度为4.8～7.9m之间。采用有限差分数值模拟方法对富水覆岩特厚煤层综放开采覆岩破坏规律进行了模拟研究，分析了采动过程覆岩的破坏场、应力场，以及在不同采宽条件下导水裂隙带高度变化，给出首采区工作面合理工作面斜长为160～180m。以实验和现场调查为依托，结合顶板“三带”理论，建立垮落带和裂隙带数学模型，计算分析影响两带高度的相关物理量之间的关系，分析其最终形态数学原理。在此基础上，结合实际分析了影响导水裂隙带高度的主要因素有工作面开采长度、采厚、工作面斜长、岩层岩性。同时分析了富水覆岩的三种基本结构，给出综放开采条件下覆岩运动结构拱-梁结构，运动实质上是拱结构向梁结构的运动转换过程。根据实验模拟结果，结合胡家河矿首采工作面地质条件，采用多元线性回归分析了影响导水裂隙带高度的各因素之间量的关系，给出相应的计算公式，并与生产单位实际情况相比较，准确性较高，，可靠性较好，具有一定的参考意义。
[Abstract]:The failure characteristics of overlying strata under the condition of fully mechanized caving mining in extra thick coal seam are less studied at home and abroad, and the movement of overlying strata is directly related to the development height of water diversion fracture zone, which can make the surface water located in the mining area. The underground water collapses into the underground, threatening the safety of the underground operation. Therefore, it is of great economic benefit and social significance to study the law of movement and failure of overlying strata in extra-thick coal seam. According to the engineering geological conditions of Hujiahe Coal Mine in Binchang Mining area, the process of fully mechanized caving mining under different mining heights (10m, 8m, 6m) was studied by means of physical similarity simulation test method. The law of rock mass migration and fracture propagation during mining in overlying strata is analyzed. The development height of water diversion fracture zone is about 14 times higher than that of mining height, so that the reasonable mining height is between 4.8 m and 7.9 m. In this paper, finite difference numerical simulation method is used to simulate the failure law of overlying rock in fully mechanized top-coal caving mining with water-rich overlying rock and extra-thick coal seam. The failure field, stress field and height change of water-conducting fracture zone in different mining width are analyzed. The reasonable slope length of the working face in the first mining area is 160 m 180 m. On the basis of experiment and field investigation, combined with the theory of "three zones" of roof, the mathematical models of collapse zone and fracture zone are established. The relationship between the physical quantities affecting the height of the two zones is calculated and analyzed, and the mathematical principle of final shape is analyzed. On this basis, combined with the actual analysis of the water diversion fracture zone height of the main factors are working face mining length, mining thickness, face slope length, rock lithology. At the same time, three basic structures of water-rich overlying rock are analyzed, and the arch-beam structure of overlying rock motion structure under the condition of fully mechanized top-coal caving mining is given. In essence, the movement is the movement transformation process from arch structure to beam structure. According to the experimental simulation results, combined with the geological conditions of the first mining face of Hujiahe Mine, the relationship between the factors affecting the height of the water diversion fracture zone is analyzed by multiple linear regression, and the corresponding calculation formula is given. And compared with the actual situation of the production unit, the accuracy is higher, the reliability is better, and has certain reference significance.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD823.254;TD742

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