Theoretical and Numerical Investigations of the Failure Characteristics of a Faulted Coal Mine Floor Above a Confined Aquifer
Theoretical and Numerical Investigations of the Failure Characteristics of a Faulted Coal Mine Floor Above a Confined Aquifer
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承压含水层以上断层煤矿底板破坏特征的理论与数值研究
DOI：
10.1007/s10230-021-00780-4
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发表时间：
2021-04
影响因子：
2.8
通讯作者：
Song Wencheng
中科院分区：
文献类型：
--
作者：
Liang Zhengzhao;Song Wencheng
基于岩体极限平衡理论，采用力学模型分析断层和无断层矿底板的破坏深度。此外，还对失效特征和突水路径进行了数值研究。然后将结果与现场观察进行比较，以验证这些模型。采空区附近的底板岩层中，采空区附近的采矿诱发破坏区（不对称的“倒鞍”形状）比切空附近的底板岩层更大。最大断层诱发破坏深度约为完整底板深度的两倍，与现场观测结果大致相当。数值模型在采矿过程中观察到底板地层的三个特征区域：采矿诱发破坏区、不透水区和断层再活动区。破坏区的形成大致可分为初始阶段、稳定阶段和突变阶段。这项研究为预测断层引起的矿井突水提供了更好的理解。
Mechanical models were used to analyze the failure depth of faulted and faultless mine floors based on the limit equilibrium theory of rock mass. In addition, the failure characteristics and water-inrush pathways were numerically investigated. The results were then compared, along with in-situ observations to validate these models. The mining-induced failure zone (an asymmetric “inverted saddle” shape) near the mined-out area was larger in the floor strata beneath the area around the coalface than that near the open-off cut. The maximum fault-induced failure depth was approximately twice that of the intact floor, which was generally equivalent to the in-situ observations. Three characteristic zones in the floor strata were observed during the mining process in the numerical models: a mining-induced failure area, a water-impervious area, and a fault reactivation area. The formation of the failure zone can be roughly divided into an initial stage, a stable stage, and a mutation stage. This study provides an improved understanding for predicting fault-induced mine water-inrushes.
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影响因子：
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