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为掌握顺层钻孔施工过程中应力、位移变化规律,建立了FLAC3D数值模型,根据模拟结果和钻孔周围应力分布理论,对整个过程中应力、位移变化规律进行分析,并在平煤集团八矿进行钻孔窥视工业性试验。结果表明:钻孔施工过程中,扰动煤体依次经历原始应力、应力升高直至峰值、应力下降、残余应力4个阶段,同时位移增大速度呈现出由小变大再变小的特征;成孔之后,钻孔径向上依次存在卸压区、应力集中区和原岩应力区,距离钻孔中心越近,煤体的位移量越大,反之越小,且与钻孔中心同等距离处的上部煤体位移比下部大。
In order to understand the variation regularity of stress and displacement in the course of the borehole drilling, the FLAC3D numerical model is established. According to the simulation results and the stress distribution theory around the borehole, the stress and displacement of the whole process are analyzed. Mine drilling to peep industrial test. The results show that during the drilling process, the disturbed coal body successively undergoes the initial stress, the stress increases until the peak value, the stress decreases and the residual stress. At the same time, the increasing velocity of the coal increases from small to large and then decreases. After the hole, the pressure relief zone, the stress concentration zone and the original rock stress zone exist in turn in the radial direction of the borehole. The closer to the borehole center, the larger the displacement of the coal body, and vice versa, and the same distance from the borehole center Upper part of coal displacement than the lower part.