黔北小屯煤矿上覆岩溶强径流带对开采影响的研究
发布时间：2018-08-18 13:34
【摘要】：贵州省具有丰富的煤炭资源,是我国南方最大产煤省区,同时贵州是我国主要岩溶地貌分布区,超过70%的土地是典型的喀斯特地貌。复杂的地形及其分布不均匀的地表、地下岩溶地貌与岩溶含水层,造就了地下水系统复杂性。特别是赋存于径流带内水量大而极不均匀的岩溶水,给岩溶充水矿井的水害防治带来极大威胁与挑战。论文以黔北毕节地区小屯煤矿为例,以已有水文地质资料为基础,开展野外水文地质调查。小屯煤区岩溶发育受地层岩性、地质构造和水动力条件的影响,形成矿区内岩溶个体形态的多样性;将玉龙山灰岩按照岩溶垂向发育程度,划分为岩溶强径流带、溶蚀裂隙充水带、岩溶空隙充填带三个带。设计实施连通试验探查强径流带的泄水通道,推测强径流带泄水管道在玉龙山上亚段中。利用示踪剂时间穿透曲线求得示踪剂回收率约为45%;示踪剂平均滞留时间5.75 h;示踪剂平均运移速度0.065 m/s;泄水通道系统体积为862.5m3;强径流带的平均雷诺数为43668,为强紊流态。分析强径流带周围钻孔数据,测试顶板岩石力学性质,按岩芯RQD值和岩石坚硬程度评价覆岩工程地质条件,将主采煤层顶板岩性划分为中硬。利用RFPA2D软件模拟了小屯煤矿顶板岩性组合下煤层开采覆岩裂隙演化过程,数值模拟的裂隙发育到沙堡湾段粉砂岩中;煤层开采影响下,玉龙山段岩层垂向位移最大值为62 mm,应力分布呈现明显的三个区,即应力升高区,应力降低区,原岩应力区;受采动影响,泥质灰岩中的岩溶微裂隙、溶蚀孔隙等可能会加速发育,隔水性能减弱,渗透系数增大。
[Abstract]:Guizhou Province is rich in coal resources and is the largest coal-producing province in the south of China. Guizhou is the main karst landform distribution area in China. More than 70% of the land is a typical karst landform. The complex topography, uneven distribution of surface, underground karst landform and karst aquifer make the groundwater system complex. Especially the karst water which exists in the runoff zone with a large amount of water and extremely uneven water brings great threat and challenge to the prevention and treatment of water hazard in the karst water-filled mine. Taking Xiaotun coal mine in Bijie area of northern Guizhou as an example, based on the existing hydrogeological data, the field hydrogeological investigation is carried out. The karst development in Xiaotun coal area is influenced by stratigraphic lithology, geological structure and hydrodynamic conditions, forming the diversity of karst individual morphology in the mining area, the Yulongshan limestone is divided into karst strong runoff zone according to the karst vertical development degree. There are three zones of karst void filling zone and water filling zone of dissolution fissure. The drainage channel of strong runoff zone is designed and explored by connecting test, and it is inferred that the drainage pipeline of strong runoff belt is in Yulong Mountain subsection. The tracer recovery is about 455h, the average retention time is 5.75h, the average migration speed of tracer is 0.065 m / s, the volume of drainage channel system is 862.5m3, and the average Reynolds number of strong runoff zone is 43668, which is a strong turbulent state. The borehole data around the strong runoff zone are analyzed, the mechanical properties of roof rock are tested, the engineering geological conditions of overburden rock are evaluated according to the RQD value of core and the degree of rock hardness, and the roof lithology of main mining seam is divided into medium hardness. The evolution process of overburden cracks in coal seam mining under roof lithology combination of Xiaotun coal mine is simulated by RFPA2D software. The maximum vertical displacement of the rock layer in Yulong Mountain is 62 mm, and the stress distribution is obvious in three areas, namely, the area of increasing stress, the area of decreasing stress, the area of stress of original rock, the karst microfracture in marsh limestone affected by mining, the maximum value of vertical displacement of rock layer is 62 mm, and the distribution of stress is obvious. The dissolution pores may accelerate the development, weaken the water insulation and increase the permeability coefficient.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD745
本文编号：2189627
[Abstract]:Guizhou Province is rich in coal resources and is the largest coal-producing province in the south of China. Guizhou is the main karst landform distribution area in China. More than 70% of the land is a typical karst landform. The complex topography, uneven distribution of surface, underground karst landform and karst aquifer make the groundwater system complex. Especially the karst water which exists in the runoff zone with a large amount of water and extremely uneven water brings great threat and challenge to the prevention and treatment of water hazard in the karst water-filled mine. Taking Xiaotun coal mine in Bijie area of northern Guizhou as an example, based on the existing hydrogeological data, the field hydrogeological investigation is carried out. The karst development in Xiaotun coal area is influenced by stratigraphic lithology, geological structure and hydrodynamic conditions, forming the diversity of karst individual morphology in the mining area, the Yulongshan limestone is divided into karst strong runoff zone according to the karst vertical development degree. There are three zones of karst void filling zone and water filling zone of dissolution fissure. The drainage channel of strong runoff zone is designed and explored by connecting test, and it is inferred that the drainage pipeline of strong runoff belt is in Yulong Mountain subsection. The tracer recovery is about 455h, the average retention time is 5.75h, the average migration speed of tracer is 0.065 m / s, the volume of drainage channel system is 862.5m3, and the average Reynolds number of strong runoff zone is 43668, which is a strong turbulent state. The borehole data around the strong runoff zone are analyzed, the mechanical properties of roof rock are tested, the engineering geological conditions of overburden rock are evaluated according to the RQD value of core and the degree of rock hardness, and the roof lithology of main mining seam is divided into medium hardness. The evolution process of overburden cracks in coal seam mining under roof lithology combination of Xiaotun coal mine is simulated by RFPA2D software. The maximum vertical displacement of the rock layer in Yulong Mountain is 62 mm, and the stress distribution is obvious in three areas, namely, the area of increasing stress, the area of decreasing stress, the area of stress of original rock, the karst microfracture in marsh limestone affected by mining, the maximum value of vertical displacement of rock layer is 62 mm, and the distribution of stress is obvious. The dissolution pores may accelerate the development, weaken the water insulation and increase the permeability coefficient.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD745
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