兴隆庄煤矿下组煤安全带压开采条件评价

发布时间：2018-02-03 13:36

本文关键词： 下组煤带压开采突水系数阻渗强度安全带压系数　出处：《中国矿业大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着煤矿开采深度不断增加,煤层底板突水已成为威胁煤矿安全生产的主要矿井地质灾害之一,研究采动影响下下组煤底板隔水岩层的阻渗性能,对于底板突水的评价和防治具有重要意义。为此,本文以兖州矿区兴隆庄煤矿下组煤底板带压开采为工程背景,对其深部下组煤采区的突水危险性进行了综合研究。根据矿井水文地质资料及相邻矿井的下组煤底板带压开采资料,分析了兴隆庄煤矿下组煤底板带压开采条件。影响下组煤安全开采的含水层主要为十三灰、十四灰和奥灰,井田范围内十四灰大部分沉缺,且十三灰与十四灰间隔厚度较小,将十三灰与十四灰并为同一含水层考虑。奥灰含水层富水性中等,主要通过断裂构造与其他含水层发生水力联系。下组煤底板砂岩、薄层灰岩及泥质岩均为良好的隔水层,17煤与十三灰、十三灰与奥灰两个隔水层段的岩性及其组合结构、发育厚度对于下组煤底板带压开采的安全性起到至关重要的作用。通过现场原位压渗实验,获取兖州矿区下组煤不同岩性组合及结构条件底板的阻渗性对比试验数据,提出了适用于兴隆庄煤矿下组煤底板不同岩性及结构的阻水岩层平均阻渗强度建议值,在此基础上建立基于阻渗条件的评价模型。综合运用突水系数法和阻渗条件对兴隆庄煤矿下组煤带压开采底板突水危险性进行了评价分区,结果表明井田17煤正常结构状态底板在井田东南边下一、下三等采区存在发生十三灰水突水的可能。对于构造扰动底板,根据煤层与含水层间阻水岩层厚度进行分区评价,结果表明发生十三灰水沿断层带导渗的可能性很大,阻水岩层厚度小于60m时,存在奥灰水沿断层带导渗的可能,阻水岩层厚度大于60m时开采16上煤对于落差不大于8m的断层,底板阻水岩层可以有效地阻隔奥灰水沿断层带导渗,开采17煤时,5m落差是断层发生渗透破坏的临界条件。最后以兖州矿区相邻井田两个下组煤工作面为例,对比分析突水系数法和阻渗条件评价下组煤底板带压开采安全条件的适用性,结果表明阻渗强度能更加真实地反映底板阻水能力。此次基于阻渗条件对兴隆庄煤矿下组煤底板带压开采条件的评价结果能够有效地指导井田下组煤开采,为井田下组煤带压开采水害防治提供技术保障。
[Abstract]:With the increasing of coal mining depth, water inrush from coal seam floor has become one of the main geological hazards threatening the safety of coal mine production. It is of great significance for the evaluation and prevention of floor water inrush. Therefore, this paper takes the coal floor pressure mining of Xinglongzhuang coal mine in Yanzhou mining area as the engineering background. The risk of water inrush in the deep coal mining area is studied synthetically. According to the hydrogeological data of the mine and the pressure mining data of the coal floor of the adjacent coal mine, the paper makes a comprehensive study on the risk of water inrush in the deep coal mining area. The pressure mining conditions of the coal floor in the lower formation of Xinglongzhuang coal mine are analyzed. The aquifer that affects the safe mining of the lower coal is mainly 13 ash, 14 ash and Ordovician ash, and most of the 14 ash in the mine field is deficient. And the thickness of 13 ash and 14 ash interval is small, 13 ash and 14 ash are considered as the same aquifer. The coal floor sandstone, thin layer limestone and argillaceous rock of the lower formation are all good water-separated strata, such as 17 coal and 13 ash. The lithology and its combination structure of 13 ash and Ordovician water barrier layer are very important for the safety of the coal floor pressure mining in the lower group. The in-situ pressure-osmosis experiment is carried out. The comparative test data of the impermeability of different lithologic assemblages and structural conditions of coal floor in Yanzhou mining area are obtained. The suggested values of the average impermeability strength of the water-resistant rock strata suitable for different lithology and structure of the coal floor of the lower formation of Xinglongzhuang Coal Mine are put forward. On the basis of this, the evaluation model based on impermeability condition is established, and the risk of water inrush on the floor of the lower coal seam of Xinglongzhuang Coal Mine is evaluated by using the water inrush coefficient method and the impermeable condition. The results show that there is a possibility of 13 ash water inrush from the bottom plate of No. 17 coal under the southeast and the lower third class mining area of the mine field. The results show that the possibility of 13 ash water permeating along the fault zone is very high, when the thickness of water barrier rock layer is less than 60 m. There is the possibility of the permeation of Ordovician water along the fault zone. When the thickness of the water-blocking rock layer is more than 60 m, when the thickness of the water-blocking strata is more than 60 m, for the fault with the drop of less than 8 m, the water-proof rock layer of the bottom plate can effectively block the permeability of the water-proof layer along the fault zone. When mining 17 coal, the drop of 5 m is the critical condition of fault seepage failure. Finally, two coal faces of two lower groups in the adjacent mine field of Yanzhou mining area are taken as an example. Comparing and analyzing the applicability of safety condition of coal floor pressure mining under water inrush coefficient method and impermeable condition. The results show that the impermeable strength can reflect the water resistance ability of the floor more truthfully, and the evaluation result based on the impermeability condition to the mining condition of the coal floor pressure in the lower group of Xinglongzhuang Coal Mine can effectively guide the coal mining under the coal group in the mine field. It provides technical guarantee for prevention and cure of water hazard in coal mining of the lower coal group in the mine field.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD745

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