宁正矿区白垩系砂岩水文地质特征及煤层顶板涌水危险性评价

发布时间：2018-03-13 22:21

本文选题：宁正矿区　切入点：白垩系砂岩　出处：《河北工程大学》2013年硕士论文　论文类型：学位论文

【摘要】：白垩系砂岩在鄂尔多斯盆地广泛分布，其中洛河组水文地质条件特殊。下部侏罗系煤层开采形成顶板冒落裂隙将沟通上覆洛河组含水层，矿井遭受顶板水害威胁。因此，系统研究白垩系砂岩的水文地质特征及其顶板涌水危险性进行评价，具有重要现实意义。本文从宁正矿区煤田地质勘探资料入手，结合区域地质条件，分析白垩系砂岩的水文地质特征，洛河组砂岩在矿区东、西部渗透性弱，中部为中等渗透性；矿区大部分为中等富水区，中部分布强富水区；洛河组地下水矿化度高，循环交替缓慢，以静储量为主。通过计算，8#煤开采形成的导水裂隙带将导通上部洛河组含水层，，砂岩水将沿裂隙带涌入矿井，采用“大井法”和比拟法计算了矿井涌水量，矿井系统面临洛河组砂岩水的顶板水害威胁。运用“三图法”对矿区洛河组承压水顶板水害危险性进行分区，矿区西部主要为较危险区，中部强富水区为危险区，呈东西向带状分布，向东由于富水性变弱变为较危险和较安全区；在矿区东南部，为主要的较危险区，安全区则为导水裂隙带未导通上部含水层的区域。评价结果对矿井防治水工作提供了指导，对区域内相似矿区具有借鉴意义。
[Abstract]:The Cretaceous sandstone is widely distributed in the Ordos basin, among which the Luohe formation has special hydrogeological conditions. The roof caving fissure formed in the lower Jurassic coal seam will communicate with the upper overlying Luohe formation aquifer, and the mine will be threatened by roof water disaster. It is of great practical significance to systematically study the hydrogeological characteristics of the Cretaceous sandstone and the assessment of the roof water inrush hazard. Based on the data of coalfield geological exploration in Ningzheng mining area and combined with regional geological conditions, this paper analyzes the hydrogeological characteristics of Cretaceous sandstone. The sandstone of Luohe formation has weak permeability in the east and west of the mining area, but medium permeability in the middle part. Most of the mining areas are medium water-rich areas with strong water-rich areas in the central part, the groundwater mineralization degree of Luohe formation is high, the circulation is slow, and the static reserves are the main one. Through the calculation of the water-conducting fissure zone formed by the coal mining of Guan8#, the upper Luohe formation aquifer will be diverted. The sandstone water will flow into the mine along the fissure zone. The mine water discharge is calculated by using the "large well method" and the analogy method. The mine system is faced with the roof water hazard threat of the sandstone water in the Luohe formation. In this paper, the risk of water hazard of confined water roof of Luohe formation in mining area is divided by "three maps method". The west part of mining area is mainly dangerous area, and the strong water rich area in the middle area is dangerous area, which is distributed in the east and west direction. Eastward, due to the weakening of water enrichment into more dangerous and safer areas; in the southeast of the mining area, the main dangerous area, and the safety zone is the area where the upper aquifer of the water-conducting fissure zone is not diverted. The evaluation results provide guidance for the prevention and control of mine water. It can be used for reference for similar mining areas in the region.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD745

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