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.

基于岩体极限平衡理论，利用力学模型对断层和无错矿层的破坏深度进行了分析。此外，还对破坏特征和注水路径进行了数值研究。然后将结果与现场观察结果进行比较，以验证这些模型。采空区附近的开采诱发破坏区域（不对称的“倒鞍形”形状）在煤层周围区域下方的地层中比在露天矿附近更大。断层引起的最大破坏深度约为完整底板的两倍，这通常与现场观测结果相同。在数值模型的开采过程中，观察到了地层中的三个特征区域：一个开采引起的破坏区域，一个不透水区域，和故障重新激活区域。失效区域的形成可以大致分为初始阶段，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。