郭屯矿底部含水层水文地质特征及其失水因素
Hydrogeological characteristics and water loss factors of “bottom aquifer” in Guotun Coal Mine
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摘要: 新生界底部含水层水位持续下降是导致我国东部矿区地面沉降或井筒变形主要原因，查明地质条件及其影响因素是治理此类灾害的重要前提。以郭屯煤矿为对象，在分析底部含水层水文地质条件的基础上，采用压水试验和Slug试验开展对其渗透性的测试分析，并分析其失水影响因素。结果表明：在工业广场范围内，底部含水层沉积空间分布存在较大差异，厚度不均，不同区域的渗透率和渗透系数也变化较大，不同位置底部含水层失水情况具有差异性；前期井筒解冻和巷道掘进及后期井筒附近工作面的开采扰动是导致底部含水层失水主要诱发因素。Abstract: The continuous decrease of the water level of the “bottom aquifer” in Cenozoic is the main cause of land subsidence or shaft deformation in the eastern mining areas of China. It is an important prerequisite to manage such disasters by identifying geological conditions and influencing factors. Taking Guotun Coal Mine as the object, on the basis of analyzing the “bottom aquifer” hydrogeological conditions, the water pressure test and the Slug test are used to carry out the test analysis of its permeability, and the factors affecting its water loss are analyzed. The results show that within the scope of the industrial square, there is a large difference in the spatial distribution of the “bottom aquifer” sediments, uneven thickness, the permeability and permeability coefficients in different areas also vary greatly, and the water loss of the “bottom aquifer” in different locations is different. The main factors that lead to “bottom aquifer” loss are thawing of wellbore in early stage, roadway driving and mining disturbance of working face near wellbore in late stage.
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Keywords:
- bottom aquifer /
- aquifer parameters /
- groundwater dynamics /
- mining crack /
- water pressure test /
- Slug test
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