薛庙滩煤矿覆岩导水裂缝带发育机理研究

发布时间：2018-04-30 18:10

本文选题：导水裂缝带 + 岩层拉伸变形量　；参考：《西安科技大学》2017年硕士论文

【摘要】：榆阳矿区地处毛乌素沙漠南缘,水资源贫乏,且该区域煤层埋深较浅,煤炭资源的大规模开发势必破坏覆岩含水层及地表水系,从而严重威胁当地脆弱的生态环境,因此实现该区域的保水开采已迫在眉睫。针对此现象,论文对榆阳矿区薛庙滩煤矿覆岩导水裂缝带发育机理展开分析研究。论文以榆阳矿区薛庙滩煤矿为研究对象,通过对薛庙滩煤矿整合区首采工作面的水文地质条件及煤层赋存状态分析,给出影响覆岩导水裂缝带发育高度的主要因素为覆岩结构、采高和开采尺寸;结合覆岩连续变形带的特征,利用两段椭圆曲线拟合覆岩下沉曲线的内外边缘,简化了覆岩层向拉伸变形量的计算方法;以基载比JZ和基采比JC为关键参数预判主关键层在“三带”中的位置,并对隔水土层稳定性进行分析,给出不同工况条件下覆岩导水裂缝带发育高度的判别流程;运用物理相似模拟、FLAC3D数值模拟及理论分析,对整合区首采工作面覆岩导水裂缝带发育特征及高度进行研究,确定了薛庙滩煤矿覆岩导水裂缝带发育高度为167.21m(即:煤层埋深);同时以关键层对覆岩导水裂缝带发育高度的抑制作用为基础,结合采高和开采尺寸对关键层破断的影响,给出了覆岩导水裂缝带的发育机理。研究成果可为榆阳矿区及相近地质条件下的矿区进行保水开采提供科学依据,对矿区合理开发利用、生态环境及水资源保护具有重要的理论研究意义。
[Abstract]:Yuyang mining area is located in the southern edge of Maowusu Desert, with poor water resources and shallow coal seams. The large-scale exploitation of coal resources is bound to destroy overlying aquifers and surface water systems, thus seriously threatening the local fragile ecological environment. Therefore, it is urgent to realize the exploitation of water conservation in this area. In view of this phenomenon, this paper analyzes and studies the development mechanism of overburden rock conductivity fracture zone in Xuemiaitan coal mine of Yuyang mining area. This paper takes Xuemiaotan coal mine in Yuyang mining area as the research object, through the analysis of the hydrogeological conditions of the first mining face and the occurrence state of coal seam in the integrated area of Xuemiatan coal mine, the main factors affecting the development height of the overburden water conductivity fracture zone are the overburden structure. Mining height and mining size, combined with the characteristics of continuous deformation zone of overburden, two elliptic curves are used to fit the inner and outer edges of overburden subsidence curve, which simplifies the calculation method of overlying strata tensile deformation. Taking the ratio of base to load JZ and the ratio of base to mining JC as the key parameters, the position of the main key layer in the "three zones" is forecasted, and the stability of the impermeable soil layer is analyzed, and the discriminant flow of the development height of the water-conducting fracture zone of overburden rock under different working conditions is given. Based on the numerical simulation and theoretical analysis of physical similarity simulation and FLAC3D, this paper studies the development characteristics and height of the overburden water diversion fracture zone in the first mining face in the integrated area. It is determined that the development height of the overburden water conductivity fracture zone is 167.21 m (that is, the coal seam buried depth), and the influence of mining height and mining size on the breaking of the key layer is based on the inhibition of the critical layer to the development height of the overburden water conductivity fracture zone. The development mechanism of the water-conducting fracture zone of overburden rock is given. The research results can provide scientific basis for water conservation mining in Yuyang mining area and similar geological conditions, and have important theoretical significance for rational development and utilization of mining area, ecological environment and water resources protection.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD74;P641.461

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