基于断层影响下的覆岩应力演化规律分析

Analysis of Stress Evolution Law of Overburden Strata Based on the Influence of Fault

在断层影响下,覆岩的破断形式以及应力分布等都将发生变化。为分析断层对覆岩应力演化的影响,采用FLAC3D数值计算方法,以某矿的断层赋存特点为工程背景,模拟分析了下盘工作面向正断层推进过程中工作面超前支承压力与弹性应变能分布规律。研究结果表明:由于断层带的存在,阻隔了覆岩的应力传播。随着工作面逐渐接近断层,工作面超前支承压力与弹性应变能显著增高;断层处的应力与弹性应变能大量积聚,极易诱发冲击地压。该研究对相似地质条件下的煤层冲击地压的预测及防治起到指导作用。

Under the influence of fault,forms and the stress distribution of the overburden rock will change. To analyze the effect of fault on the stress evolution law of coal face with FLAC3 Dnumerical calculation method,the fault occurrence characteristics of a mine as engineering background,the simulation analysis of the footwall face normal fault efforts to promote the advance abutment pressure and the elastic strain energy in the process of distribution. The results show that the fault block of strata stress significantly. As working face close to the fault,advance abutment pressure and the elastic strain energy increased significantly; vertical stress and elastic strain energy accumulation near the fault,easy to induce impact ground pressure. The study of similar geological conditions of the prediction and prevention of percussive ground pressure of coal seam play a guiding role.