采动影响下断层滑移诱发煤岩冲击机理

根据断层滑移失稳与煤岩冲击矿压的关系，建立了断层滑移诱发煤岩冲击的黏滑-黏弹脆性体突变模型。以山东济三煤矿6303工作面地质资料为背景，采用FLAC5.02D数值模拟软件模拟了煤层开采过程中断层对顶板运动的影响。研究结果表明：断层滑移诱发煤岩冲击分为两种力学机制，一是在断层活动条件下“断层滑移失稳动态诱发冲击矿压机理”；二是在断层相对稳定条件下“断层滑移稳态诱发冲击矿压机理”。断层滑移失稳动态诱发冲击矿压与断层滑移稳态诱发冲击矿压相比，更容易发生冲击矿压，且释放能量更多。断层滑移速度与工作面推进速度、工作面距断层距离、断层面力学性质、断层正压力和开采深度有关。工作面无论是由断层下盘还是由断层上盘向断层推进，工作面距断层越近，断层滑移量、滑移速度越大。工作面由断层下盘向断层推进时断层滑移量、滑移速度远大于工作面由上盘向断层推进时的，发生断层冲击矿压的危险性就越高。

Mechanism of fault slip induced rockburst during mining

Based on the relation between fault slip destabilization and rockburst，a catastrophe model of Strike slip and Viscous elastic brittle was established in order to study the mechanism of fault slip induced rockburst.The FLAC5.02D numerical simulation software was used to study the effect of fault on roof movement during mining according to the geological conditions of No.6303 working face in Jining No.3 Coal Mine.The results show that the mechanics criterion of fault slip induced rockburst can be analyzed by the following two kinds:the first mechanism is fault slip dynamically induced rockburst when the fault with a high slip velocity，such as fault slip destabilization，and the second mechanism is fault slip statically induced rockburst when the fault with a low slip velocity.In the first kind，the rockburst is easy to happen，and more energy is violently released comparability.The velocity of fault slip is related to the velocity of working face advancing，the distance from working face to the fault，strength property of fault plane，normal stress of fault plane and the mining depth.The fault slip displacement and slip velocity sharply increase when the working face advances from the footwall to the fault itself or from the hanging wall to the fault itself.The slip displacement and slip velocity when the working face advances from the footwall to the fault is higher than that the face from the hanging wall to the fault，which results in a high risk of a fault rock burst.