巍山煤矿开采对地下水影响的数值模拟研究

发布时间：2018-04-14 15:21

本文选题：煤层开采 + 地下水　；参考：《太原理工大学》2015年硕士论文

【摘要】：在我国经济迅速稳定发展的步伐中，煤炭资源做出了巨大贡献。山西省作为煤炭资源大省，虽然近几年经过整合，生产水平不断提高，，但是煤炭开采对地下水环境的影响不可忽略，主要表现为采空形成的导水裂隙带破坏了煤层上覆含水层的隔水层，导致上覆含水层发生漏失，改变了原有地下水流场的补径排条件，形成新的地下水流场。本文以巍山煤矿井田为主要研究对象，采用数值模拟对井田煤系上覆二叠系与石炭系含水层地下水流场演化趋势的预测，在此基础上提出地下水防治措施。巍山煤矿位于山西省榆次区，煤层开采过程中，对煤层所在的含水层排水来保证生产安全，在抽水后与上覆含水层易形成较大水位差，由于中间存在较完整且连续的隔水层，因此对上覆含水层影响不大，但是采空形成的导水裂隙带会使含水层之间重新建立起水力联系。本文根据现有的工程地质、水文地质条件，应用基于有限元理论的GMS软件，建立了矿区水文地质概念模型和数学模型，经过反复调整参数，达到了良好的拟合效果，分析了煤系上覆各含水层流场分布，预测了开采初期（一采区煤层开采完）和开采完15号煤层后对煤系上覆各含水层地下水水位影响范围，及预测了开采2.82年与11.7年后煤系上覆基岩裂隙各含水层地下水位流场的变化。预测结果可知，煤矿开采11.7年后，模拟区部分内煤系上覆各含水层水井将受到不同程度的影响。经过模型模拟预测，根据地下水水位流场的评价结果，并参考相关的保护方法研究成果，提出对地下水含水层的保护、居民供水方案、地下水含水层跟踪监测计划三方面采取具体的保护措施。为了更好地了解与保护地下水水资源，布置了详细的监测方案，能够准确的了解地下水位与水量的变化情况。
[Abstract]:In the pace of rapid and stable economic development in China, coal resources have made great contributions.As a large province of coal resources, although the production level of Shanxi Province has been continuously improved through integration in recent years, the impact of coal mining on the groundwater environment cannot be ignored.The main manifestation is that the water-conducting fissure zone formed by the mining cavities destroys the water-separating layer of the overlying aquifer in the coal seam, which leads to the leakage of the overlying aquifer, changes the condition of the original groundwater flow field, and forms a new groundwater flow field.This paper takes Weishan coal mine as the main research object, uses the numerical simulation to predict the evolution trend of the overlying Permian and Carboniferous aquifer groundwater flow field, and puts forward the groundwater prevention measures.Weishan Coal Mine is located in Yuci District, Shanxi Province. During coal seam mining, the aquifer in which the coal seam is located is drained to ensure the safety of production. After pumping water, it is easy to form a large water level difference with the overlying aquifer.Therefore, there is little influence on the overlying aquifer, but the hydraulic connection between the aquifers will be re-established by the fissure zone formed by the mining.According to the existing engineering geology, hydrogeological conditions and GMS software based on finite element theory, the conceptual model and mathematical model of hydrogeology in mining area are established in this paper.The distribution of the flow field of each aquifer overlying the coal measure is analyzed, and the influence range of the groundwater level of the overlying aquifer in the first mining area (the coal seam in the first mining area) and in the coal seam No. 15 after mining is predicted.The change of groundwater level and flow field in each aquifer of overlying bedrock fissure in coal measures after 2.82 years and 11.7 years after mining is predicted.The prediction results show that, after 11. 7 years of coal mining, the wells covered with each aquifer in part of the simulated area will be affected to some extent.Through model simulation and prediction, according to the evaluation results of groundwater level and flow field, and referring to the research results of relevant protection methods, the protection of groundwater aquifers and the plan of water supply to residents are proposed.Specific protection measures are adopted in three aspects of groundwater aquifer tracking monitoring plan.In order to better understand and protect groundwater resources, a detailed monitoring scheme is arranged, which can accurately understand the change of groundwater level and water volume.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P641.4

【参考文献】