Abstract There is a risk of floor failure within mining of coal seams above aquifers, therefore investigating the processes involved is of great significance for the prediction and prevention of mine water hazards. With consideration of the effects of mining pressure and non-uniformly distributed hydraulic pressure, the two-dimensional (2D) hydraulic-mechanical calculation (HM) model and the key-strata stability analysis (KS) model were proposed to analyze the theoretical range of failure and the stability of inclined floor strata after mining. To validate the model, a numerical simulation of the failure characteristics of inclined floor above a confined aquifer was conducted along with an in-situ investigation. The results showed approximate agreement between the theoretical and simulated failure ranges of the inclined floor along the strike and inclination, with their characteristics being approximate to “spoon-shaped” and “inverted saddle-shaped with upper-small-lower-large”, respectively. The theoretical failure depths of the floor around the mining face side and the upper and lower parts were 13 m, 12.5 m and 14 m, respectively, with general agreement between simulated and measured results. Moreover, the zones prone to water intrusion were indicated to be mainly distributed near the upper end, lower end and mining face side of the inclined key strata, in good agreement with the distribution of the area disturbed by mining and the risk of groundwater inrush induced by the vertical failure depth. The research results could provide an improved understanding of the mechanism of water inrush from underlying aquifers.

中文翻译：

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模拟开采和水压致倾斜底板地层破坏范围和稳定性的理论模型

摘要 含水层以上煤层的开采存在底板破坏的风险，因此研究其过程对矿井水害的预测和预防具有重要意义。考虑采掘压力和非均匀分布水压的影响，提出二维（2D）水力-力学计算（HM）模型和关键地层稳定性分析（KS）模型，分析其理论范围。开采后倾斜底板的破坏和稳定性。为了验证该模型，对承压含水层上方倾斜底板的破坏特性进行了数值模拟，并进行了现场调查。结果表明，斜底板沿走向和倾斜方向的理论破坏范围与模拟破坏范围近似一致，其特征分别近似于“勺形”和“上小下大倒鞍形”。 . 采掘工作面周边底板和上下部理论破坏深度分别为13 m、12.5 m和14 m，模拟结果与实测结果基本一致。此外，表明易发生水侵入的带主要分布在倾斜关键地层的上端、下端和开采面侧附近，与开采扰动区的分布和诱发地下水突涌的风险非常吻合。由垂直破坏深度。