Abstract Water inrush incidents threaten the safety of coal mining. Understanding of hydrogeologic parameter distributions is critical for preventing water-related hazards in coal mines. During the deep mining (>1000 m) under the North China Plain, water from water-bearing strata discharges into coal seams through geologic conduits (i.e. water inrush) due to the fractured zone under the floor of working faces. In this study, a water inrush incident was exploited as an active stimulus. A 3D groundwater flow model was built for the eighth member of the Middle Ordovician system in Xingdong coal mine. Using this model and an inverse approach, we first checked if the data from the incident and an independent pumping test carry non-redundant information about the heterogeneity of the mine. Afterward, we combined these datasets to conduct a large-scale (approximately 10 km) hydraulic tomography (HT) analysis. The estimated hydraulic conductivity distribution from the HT analysis is found consistent with the distribution of known geologic faults. That is, a cluster of faults is characterized as a high-conductivity zone. A high conductivity zone is identified at locations close to the water inrush location, which is the high cement consumption zone during the grouting project. Finally, results of this study promote exploiting the water inrush events as a HT survey for mapping geologic structures over a large area.

中文翻译：

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水力层析成像在深部煤矿中的应用：结合传统抽水试验与突水事故

摘要 突水事故威胁着煤矿开采安全。了解水文地质参数分布对于预防煤矿中与水有关的危害至关重要。华北平原深部开采（>1000m）时，由于工作面底板下的裂缝带，含水层的水通过地质管道（即突水）排入煤层。在这项研究中，突水事件被用作主动刺激。兴东煤矿中奥陶统八段建立了地下水流三维模型。使用此模型和逆向方法，我们首先检查来自事故和独立抽水测试的数据是否携带有关矿井异质性的非冗余信息。之后，我们结合这些数据集进行大规模（约 10 公里）水力断层扫描 (HT) 分析。发现从 HT 分析估计的水力传导率分布与已知地质断层的分布一致。也就是说，一组断层被表征为高导区。在靠近突水位置的位置确定了一个高电导率区，这是注浆工程中的高水泥消耗区。最后，本研究的结果促进了利用突水事件作为大面积地质构造测绘的 HT 调查。一组断层被称为高导区。在靠近突水位置的位置确定了一个高电导率区，这是注浆工程中的高水泥消耗区。最后，本研究的结果促进了利用突水事件作为大面积地质构造测绘的 HT 调查。一组断层被称为高导区。在靠近突水位置的位置确定了一个高电导率区，这是注浆工程中的高水泥消耗区。最后，本研究的结果促进了利用突水事件作为大面积地质构造测绘的 HT 调查。