断层叠加影响下不同断层倾角采动应力分布特征

Mining Stress Distribution Characteristics of Different Fault Dip Angles under Influence of Fault Superposition

以山东省某煤矿1300工作面为工程背景,建立断层A70°和B50°~70°叠加FLAC3D数值模型,研究了单一断层A70°下推采工作面超前应力分布规律以及A70°和B50°~70°叠加影响下工作面超前应力分布规律,以及超前应力随断层倾角变化的规律。结果表明:随着向断层不断推采,工作面超前应力在断层叠加影响下比单一断层影响下更早达到峰值,且随着断层倾角的增大,工作面超前应力受断层倾角切割效应更明显,超前应力降更小,因此应力集中也更明显。因此在回采过程中,遇断层叠加影响,工作面应紧随采煤机跟机拉架,及时有效地做好顶板支护。

Taking the 1300 working face of a coal mine in Shandong Province as the engineering background,the FLAC3Dnumerical model of the superposition of faults A70°and B50°-70°was established,and the forward stress distribution law of the single fault A70°downward pushing working face and A70°and B50°-70°were studied.The distribution law of the advance stress in the working face under the influence of superposition and the law of the advance stress changing with the dip angle of the fault are studied.The results show that with the continuous mining of the fault,the advance stress of the working face reaches its peak value earlier under the influence of the superposition of the faults than under the influence of a single fault,and as the dip angle of the fault increases,the advance stress of the working face is more obviously affected by the cutting effect of the dip angle of the fault,the leading stress drop is smaller,so the stress concentration is also more obvious.Therefore,in the process of mining,in case of the superposition of faults,the working face should follow the shearer and the pulling frame to do a good job of roof support in a timely and effective manner.