陕西煤炭

断层是工作面及其附近具有潜在脆弱性的地质构造，也是影响煤矿安全开采不可忽视的地质因素，为研究采动影响下断层活化致围岩失稳破坏，采用实际工程和数值模拟分析的方法对断层影响区附近围岩变形破坏过程进行研究。基于离散元3DEC数值模拟软件，建立采动条件下断层活化诱发围岩失稳破裂模型，对断层活化影响区的扰动应力和顶板离层监测进行了分析。结果表明，随着采煤工作面的不断推进，采动应力逐渐增大；断层附近煤层采动与顶板位移关系曲线为锯齿状，说明断层活化影响区围岩处于静载与动载叠加的状态；断层附近围岩的应力和位移随着采煤工作面的推进而增大，越靠近断层面，位移逐渐趋于零，应力也处于较低的状态。

Fault is a geological structure with potential vulnerability in the working face and its vicinity, and it is also a geological factor that can not be ignored due to its affect on the safe mining of coal mines.In order to study the destabilizing failure of the surrounding rock caused by fault activation under the influence of mining, the deformation and failure process of the surrounding rock in the vicinity of the fault-affected area is studied by using actual engineering and numerical simulation analysis.Based on the discrete element 3DEC numerical simulation software, the destabilization and rupture model of surrounding rock induced by fault activation under mining conditions was established, and the disturbing stress and roof delamination monitoring in the area affected by fault activation were analyzed.The results show that the mining stress gradually increases with the continuous advancement of the coal mining face; the relationship curve between mining and roof displacement of the coal seam near the fault is jagged, which indicates that the surrounding rock in the fault activation-affected area is in the state of superposition of static and dynamic loads; the stress and displacement of the surrounding rock near the fault increase with the advancement of the coal mining face, and the closer to the fault face, the displacement gradually goes back to zero, and the stress is in the state of lower level.