不同煤岩倾角下采场倾向矿压规律数值模拟
Numerical Simulation of Stope Tendency Mine Pressure Laws Under Different Inclination of Coal and Rock
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摘要: 为研究采场围岩活动受煤岩倾角的影响，利用数值计算软件FLAC3D对0°、30°、45° 3个模型矿压规律进行模拟，分析采场围岩应力、位移及煤壁前方塑性区的空间演变过程。研究结果表明：随煤岩倾角增大，采场顶底板应力及位移分布形态发生变化；数值量也发生变化；中上部顶板运动较为明显，中下部底板运动明显，煤壁前方塑性区减小；覆岩运动形式从单纯下沉转变为下沉-回转-反回转空间复合运动，改变了覆岩运动规律，最终导致采场矿压规律发生改变。Abstract: In order to study the influence of coal rock's inclination angle on stope surrounding rock activity, we simulated the laws of underground pressure of different inclination angles of 0°, 30°, 45°with numerical simulation software FLAC3D, analyzed the evolutionary process of stope surrounding rock stress, displacement and the plastic zone in front of coal wall. The findings indicated that the distribution of stress and displacement of roof and floor changed with the increase of coal rock's inclination angle, meanwhile, the value quantity of that also changed and the plastic zone in front of coal wall became small. The roof movement at the middle upside was obvious, but the floor movement at the middle downside was obvious. At the same time, the motion form of overlying strata changed from mere subsidence to the compound motion as subsidence- revolution-antirevolution with the increase of inclination angles.The different inclination angles changed the laws of motion of overlying strata, and then the laws of underground pressure were also changed.
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