破碎带宽度对断层活化及煤柱留设的影响研究

为研究不同宽度的断层破碎带对防水煤柱留设的影响，通过对断层活化进行力学分析，得出断层活化的必要条件是断层带内岩石的黏结系数小于等于临界值Cmax，且断层带所受法向应力与剪切应力是影响该临界值的主要因素。利用数值模拟软件，建立不同破碎带宽度的数值模型，对断层活化及煤柱留设进行模拟。结果表明:当工作面距断层60 m内时，由于黏结系数临界值Cmax的迅速减小，断层活化危险性显著提高，且断层破碎带宽度越大，断层越容易发生活化;通过分析采场塑性区分布图，得出煤柱临界尺寸随破碎带宽度的增加而呈线性增长的规律。研究结果对断层合理留设煤柱具有重要的参考价值。

Research on influence of width of fracture zone on fault activation and design of coal pillar

In order to study the influence of different width of fault fracture zone on the design of waterproof coal pillar, the mechanical analysis was conducted on fault activation. It was concluded that the necessary condition of fault activation is that the cohesive coefficient of the rock in the fault zone is less than or equal to the critical value Cmax, and the normal stress and shear stress of the fault zone are the main factors affecting the critical value. The numerical model on fracture zone with different width was established by using the numerical simulation software, and the fault activation and design of coal pillar were simulated. The results showed that when the working face is within 60 m away from the fault, the hazard of fault activation increases significantly because of the rapidly decreasing critical value of the cohesive coefficient. The larger the width of fault fracture zone, the more easily the fault activation. Through analyzing the distribution map of plastic zone in stope, it was found that the critical size of coal pillar increases linearly with the increasing width of fracture zone. The results have important reference value for reasonable design of coal pillar in fault.