充填开采上覆岩体内部预计参数研究
Study on Internal Predicted Parameters of Overburden Rock Mass in Filling Mining
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摘要: 为了准确预计风井井筒的采动变形,需要获得矿区充填开采岩体内部概率积分法的预计参数。采用数值模拟的研究方法,对充填开采引起的岩体内部移动进行了观测,获得了变形预计参数的变化规律。研究结果表明:充填开采的地表下沉系数、水平移动系数比垮落法开采分别增大了0.62%、10.03%,主要影响角正切值减小了33.86%;充填开采的岩体内部下沉系数随覆岩高度的减小而增大;水平移动系数随覆岩高度的减小呈现先减小后增大的趋势;主要影响角正切值随覆岩高度的减小而减小。充填法与垮落法开采的地表变形预计参数并不相同,岩体内部下沉系数的变化幅度受岩层的岩性和层位影响较大,主要影响角正切值的变化幅度受岩层岩性和层位影响较小。Abstract: In order to accurately predict the mining deformation of the shaft, the predicted parameters of the probabilistic integral method in the backfilling mining are obtained. The internal movement of rock mass caused by backfilling mining is observed by numerical simulation, and the variation rule of predicted parameters is obtained. Research show that: the surface subsidence factor of backfilling mining increases by 0.62% comparing with caving mining, the displacement factor of backfilling mining increases by 10.03% comparing with caving mining, and the tangent of main influence angle of it reduces by 33.86% comparing with caving mining. The subsidence coefficient increases with the decrease of overburden height. The horizontal movement coefficient decreases first and then increases with the decrease of overburden height. The tangential value of main influence angle decreases with the decrease of overburden height. The estimated parameters of surface deformation in filling and caving mining are not the same. The variation range of subsidence coefficient in rock mass is greatly influenced by lithology and stratum, and the variation range of angle tangent is mainly influenced by lithology and stratum.
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