Shanxi Zezhou Tiantaiyuenan Coal Mine Co., Ltd.

为研究综采工作面过断层时,断层对顶板破坏情况和矿压显现规律的影响,利用断裂力学理论构建计算模型研究基本顶在断层活化作用下的来压步距,铺设物理实验模型模拟工作面过不同断层时基本顶内裂扩展、贯通以及基本顶垮落、压架的过程,分析了顶板下沉量的变化特征。研究结果表明,工作面过断层时,断层对基本顶中的裂纹具有活化作用,使顶板来压步距变小,裂纹受到工作面前方的集中应力的作用不断扩展最后贯通至工作面,导致顶板发生切落破坏,对液压支架造成冲击作用使其发生压缩变形,工作面过落差不同的断层时,发现落差大的断层对工作面矿压显现的影响更大。

anized mining face passes faults, a computational model is constructed using the theory of fracture mechanics to probe theweighting step distance of the basic roof under the action of fault activation, and the physical experimental model is built tosimulate the process of basic roof’ s internal fracture propagation and penetration, basic roof collapse and support compres-sion when the working face passes through different faults, and the change characteristics of roof subsidence are analyzed.The research results show that when the working face passes through the fault, the fault has an activation effect on the crackon the basic roof, so that the weighting step distance of the roof becomes smaller, the crack is continuously expanded by theconcentrated stress in front of the working face, and finally penetrates to the working face, resulting in the cutting failure ofthe roof, and causing the compressive deformation due to impact on the hydraulic support. When the working face passesthrough faults with different drops, it is found that the fault with large drop has a greater impact on the pressure behavior onthe working face.