基于概率积分法和FLAC3D数值模拟法的地下采矿对露天采场影响分析

Analysis of the Influence of Underground Mining on Open Pit Based on Probabilistic Integral Method and FLAC3D Numerical Simulation Method

为保证某矿山地下矿体与露天矿体协同开采的安全稳定,根据矿体赋存条件,采用概率积分法与sufer软件相结合的方式,预测出地下开采引起的地表陷落结果,将预测结果、FLAC3D数值模拟结果与《有色金属采矿设计规范》中的相关规定数值进行对比,从而分析该矿山采矿方法对位于地表的露天采场稳定性的影响。采用概率积分法的变形预测结果表明,地下开采完后,整个露天边坡处于III级构筑物保护范围内;采用数值模拟法计算结果表明,地下开采完后,整个露天边坡均在II级构筑物保护范围内。理想条件下的概率积分法与FLAC3D数值模拟方法结果大致吻合,两者计算结果均在相关规范的安全允许范围内,对于地下和露天协同开采具有指导意义,也证实了2种方法的准确性。

In order to ensure the safety and stability of synergistic mining of underground orebody and open-pit orebody,the probability integral method and SUFER software are obtained according to the occurrence condition of the orebodies,the surface subsidence results are predicted.The predicted results are compared with the FLAC3D numerical simulation results through the relevant provisions in the"Non-ferrous Metal Mining Design Code",so as to analysis the influence of the mining methods on the stability of open pit located on the surface.The deformation prediction results by probability integral method show that after underground mining,the whole open slope is within the protection range of grade III structure;the computation results by using numerical simulation method show that the whole open slope is within the protection range of grade II structure after underground mining.The probabilistic integral method under ideal conditions is roughly consistent with the results of FLAC3D numerical simulation method,they are within the allowable range of safety regulations,which have guidance reference for the synergistic mining of underground and open-pit,besides that the accuracy of the two methods are confirmed.