新集矿区F10断层演化规律研究

发布时间：2018-05-26 22:27

本文选题：构造演化 + 断层组合　；参考：《安徽理工大学》2015年硕士论文

【摘要】：新集矿区位于华北板块淮南复向斜南翼,区内地质构造发育程度复杂。F10正断层是矿区落差最大、切割煤层最多的煤系内断层,对巷道布置、回采顺序部署、煤与瓦斯突出防治等矿井地质工作的开展都有着重要影响。通过资料分析、工程钻探、室内测试、原位试验等手段,对矿区的断层演化特征、断层带岩体工程力学性质、断层泥特性和区域地应力场特征等进行分析研究,深刻地揭露F10断层的性质和演化规律,对矿区生产工作部署和地质灾害防治具有借鉴意义。从区域构造背景和构造发育特征出发,探讨了大构造背景下矿区正断层演化的一般性特征,F10断层经历了印支运动、燕山运动和喜山运动三期不同方向、不同性质的构造运动改造,断层性质上表现出一定的复杂性与特殊性。结合勘探资料,揭露了F10断层的形态发育特征,附近正断层较发育,但大多表现为逆断层性质,因矿区处在南北向对冲推覆的前陆地带,倾向北的反向断层和宽缓褶曲较为发育,区内小断层走向统计主要分为NEE和SEE向共轭的两组。测试了断层带岩体的物理力学性质,分析了断层泥的级配特征、分形特征以及断层泥中粘土矿物成分、含量等,断层泥总体级配良好,粒径分布不均,粘粒含量平均占22.7%；泥质物中粘土矿物主要有高岭石、伊蒙混层以及少量的绿泥石和伊利石,高岭石占绝对含量最大；分形特征显示F10断层粘滑与蠕滑性质兼具。对原岩地应力进行测试,显示新集矿区是以NEE或近EW向水平主应力为最大主应力的构造应力场,最大和中间主应力随深度变化都分为三个阶段,说明矿区经历了三期构造运动的改造。
[Abstract]:Xinji mining area is located on the south flank of Huainan complex slope of North China plate. The complex. F10 normal fault in the area is the fault in coal measure with the largest drop in mining area and the most cut coal seam. The roadway arrangement and mining sequence are arranged. Coal and gas outburst prevention and other mine geological work has an important impact. By means of data analysis, engineering drilling, laboratory test and in-situ test, the characteristics of fault evolution, engineering mechanics of rock mass in fault zone, characteristics of fault gouge and regional stress field are analyzed and studied. It is of great significance to reveal the nature and evolution law of F10 fault, which can be used for reference in the layout of mining area production and the prevention of geological hazards. Based on the regional tectonic setting and tectonic development characteristics, this paper discusses the general characteristics of normal fault evolution in the mining area under the large tectonic background. The F10 fault has undergone three different directions: Indosinian movement, Yanshanian movement and Himalayan movement. In the reconstruction of tectonic movement with different properties, the nature of faults shows certain complexity and particularity. Combined with the exploration data, the morphological and developmental characteristics of the F10 fault are revealed. The normal fault near the fault is relatively developed, but most of the faults are of reverse fault nature, because the mining area is located in the former land belt of the north and south direction to counter the nappe. The reverse fault and wide fold in the north tend to be developed, and the strike statistics of small faults in the area are mainly divided into two groups: NEE and SEE conjugation. The physical and mechanical properties of rock mass in fault zone are tested, and the gradation and fractal characteristics of fault gouge, the composition and content of clay minerals in fault gouge are analyzed. The overall gradation of fault gouge is good and the particle size distribution is uneven. The clay minerals in the clay are mainly kaolinite, immonitic layer and a small amount of chlorite and Illite, and kaolinite is the largest in absolute content, and the fractal characteristics show that the F10 fault is both viscous and creeping. The geostress of the original rock shows that the NEE or near EW horizontal principal stress is the maximum principal stress field in Xinji mining area, and the maximum and intermediate principal stresses are divided into three stages with the depth variation. It shows that the mining area has undergone three stages of tectonic transformation.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.11

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