An analysis of sequential water releasing tests of the confined aquifers in a coal mine based on hydraulic tomography
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摘要:
水文地质参数是衡量含水层富水性的重要指标，其空间分布特征的准确推算，对于矿井突水灾害预报与防治具有积极意义。传统放水试验分析方法得到的是等效水文地质参数，不能准确刻画含水层的空间异质性。基于随时间变化的水头数据与水文地质参数的互相关分析，将水力层析法应用在陕西榆林柠条塔煤矿井下承压含水层叠加放水试验数据分析中，获得了研究区水文地质参数的空间分布特征。结果表明，工作面南北富水性差异大，涌水区位于强导水带上；从涌水区往北，导水系数和储水系数整体上逐渐减小；南部导水系数和储水系数均较大，属于富水异常区。研究表明，水力层析法是一种有效的非均质含水层参数识别的新技术，将井下放水视为针对含水层的刺激源，结合水头与水文地质参数的互相关分析，联合多个观测孔的水头响应数据，反演刻画研究区域的主要地质结构特征。在矿井水文地质条件分析中，预先采用水力层析法识别富水异常区域，可以有效降低突水事故风险。
Abstract:Hydrogeological parameters are important indices to evaluate water-yielding conditions of an aquifer, and an accurate delineation of their spatial distribution is of significance for the prediction and prevention of water-inrush incidents in underground mines. Hydrogeological parameters obtained by traditional water-releasing tests analyses are equivalent values, and the spatial heterogeneity cannot be accurately characterized. Based on cross-correlation analyses between time-dependent head data and hydrogeological parameters, hydraulic tomography is applied to interpret underground sequential water-releasing tests of confined aquifers in the Ningtiaota coal mine in Yulin of Shaanxi, and the spatial distribution of hydrogeological parameters in the study area is also analyzed. The results show that there is a great difference between the northern and southern parts of the working face, and the water-inrush area is located on a highly permeable zone. The transmissivity and storativity gradually decrease from the water-inrush area to the north. The magnitudes of both the transmissivity and storativity are high in the southern part, which indicates a water-yielding abnormal area. In conclusion, we note that the hydraulic tomography is an efficient technique for identifying the heterogeneous aquifer parameters. Underground water-releasing can be regarded as a stimulus source for aquifers. The head data and cross-correlation analyses between the head data and hydrogeological parameters are used to obtain the main geological structural characteristics of the study area. In the analyses of hydrogeological conditions of underground mines, identification of water-yielding abnormal areas by hydraulic tomography in advance can effectively reduce the risk of water-inrush incidents.
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