潘集矿区深部13-1煤层顶板工程地质特征及其稳定性评价

发布时间：2018-05-28 22:54

本文选题：潘集矿区深部 + 煤层顶板　；参考：《安徽理工大学》2015年硕士论文

【摘要】：顶板事故是我国矿井生产过程中最主要的安全生产事故,严重威胁了矿井的高效安全生产,因而对煤层顶板稳定性研究在生产实践中也有迫切的需要。本文以潘集矿区深部13-1煤层为研究对象,以60个钻孔资料为基础,从岩石物理力学性质、岩性组合及分布特征和岩石质量等方面阐述其顶板工程地质特征,并从断裂分维值、平面变形系数,岩石的抗压强度和岩性组合值等四个方面以模糊综合评价的方法对其顶板稳定程度定量评价,并在此基础上运用FLAC3D数值模拟的方法对老顶和直接顶两种顶板类型的采动效应进行分析,并与浅部开采情况进行对比。取得以下认识：潘集矿区深部13-1煤层顶板类型以直接顶型、老顶型为主；岩性分区以泥岩区和粉砂岩-泥岩区为主；总体上砂岩的RQD值和漏失量最大,粉砂岩次之,泥岩最小,但在断裂发育区RQD值小,漏失量大；岩石的抗压强度与测井特征有较好的相关性,可以用于定性的评价；岩体结构类型以块裂结构和碎裂结构为主,块状结构次之,松散结构分布范围最小；褶皱发育类型以较发育为主,轻微发育次之,而极发育分布范围最小；抗压强度分区主要以较低强度区为主,较高强度值次之,高强度区分布范围最小。运用灰色模糊综合评价把潘集矿区深部13-1煤层顶板分为四个稳定程度分区,以不稳定区和中等稳定区为主,极不稳定区和稳定区分布较少。而利用FALC3D数值模拟技术模拟不同顶板类型的采动效应特征,其结果表明：在深部开采条件下,老顶和直接顶的最大主应力值相差较小,且应力集中系数相比浅部变小；但顶板的位移相对于浅部要增大,且老顶的位移量要小于直接顶；同时表明,两带的发育高度不仅与岩性和采高有关,在一定程度上跟开采深度也有关联。通过对潘集矿区深部13-1煤层顶板工程地质特征及其稳定性的研究,能为后期建井和煤层开采提供一定的科学依据。
[Abstract]:Roof accident is the most important safety accident in mine production in our country, which seriously threatens the high efficiency and safety production of coal mine. Therefore, it is urgent to study the stability of coal seam roof in production practice. Taking deep 13-1 coal seam in Panji mining area as the object of study, based on the data of 60 boreholes, this paper expounds the roof engineering geological characteristics from the aspects of rock physical and mechanical properties, lithologic assemblages and distribution characteristics and rock quality, and the fractal dimension of faults. The stability of roof is quantitatively evaluated by fuzzy comprehensive evaluation method in four aspects: plane deformation coefficient, compressive strength of rock and lithology combination value. On this basis, the mining effects of two types of roof are analyzed by using FLAC3D numerical simulation method, and compared with shallow mining. Acquire the following awareness: The roof type of deep 13-1 coal seam in Panji mining area is mainly of direct roof type and main roof type; lithologic zoning is dominated by mudstone area and siltstone-mudstone area; on the whole, the RQD value and leakage amount of sandstone is the largest, siltstone is the second, and mudstone is the smallest. However, in the fault development area, the RQD value is small, the leakage is large, the compressive strength of rock has a good correlation with the logging characteristics, and can be used for qualitative evaluation, the rock mass structure type is mainly block fracture structure and fragmentation structure, and block structure is the second. The distribution range of loose structure is the smallest, the type of fold development is mainly relatively developed, the second is slight development, and the distribution range of polar development is the smallest, the compressive strength is mainly in the low strength area, and the higher strength is the second. The distribution range of high intensity region is the smallest. The roof of deep 13-1 coal seam in Panji mining area is divided into four stable degree zones by using grey fuzzy comprehensive evaluation. The unstable and medium stable areas are the main ones, and the distribution of extremely unstable areas and stable areas is less. The FALC3D numerical simulation technique is used to simulate the characteristics of mining effect of different roof types. The results show that under the condition of deep mining, the difference of the maximum principal stress between the main roof and the direct roof is relatively small, and the stress concentration factor is smaller than that of the shallow. However, the displacement of the roof is larger than that of the shallow, and the displacement of the main roof is smaller than that of the direct roof, which indicates that the development height of the two zones is not only related to lithology and mining height, but also related to the mining depth to some extent. The study on the engineering geological characteristics and stability of the roof of deep 13-1 coal seam in Panji mining area can provide a certain scientific basis for the later construction of well and mining of coal seam.
【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】：TD163.1;TD327.2

【参考文献】