关键层耦合作用下露井联采边坡滑动深度分析

Analysis of slope sliding depth for open-underground combined mining under coupling effects about key strata

通过理论分析和相似材料模拟实验,提出了控制露井联采边坡稳定的"关键层"概念,研究了"关键硬岩层"与"关键弱层"耦合作用下的露井联采边坡变形破坏机理。建立工程力学模型,推导出了关键层耦合作用下露井联采边坡滑动深度的预计公式,以平朔矿区安家岭露天矿北端帮井工开采引起的边坡滑动为工程实例,对公式的适用性进行了验证,结果表明,预计结果与相似材料模拟实验结果、现场位移监测结果三者基本吻合。通过研究,实现了露井联采边坡潜在滑移深度的合理预计,为露井联采时空关系优化、边界参数合理确定、边坡变形监测与失稳治理等工作提供了依据。

With the theoretical analysis and the similar material simulation experiment,the concept of the key strata which control the slope stability about open-underground combined mining was proposed,mechanism of slope deformation and destruction about open-underground combined mining under the coupling effects of key hard strata and key weak strata. Then a mechanical model was established,with witch the estimating formula of the slope sliding depth for open-underground combined mining under the coupling effects about key strata were deduced,combining with the end slope sliding engineering example caused by underground mining of Anjialing open-pit mine in Pingshuo mining area,the applicability of the formula were verified,the results show that,the expected results and similar material simulation experiment results and the displacement monitoring results are very similar. Based on this research,the reasonable estimate of the slope sliding depth for open-underground combined mining is feasible,which will provid basis for optimizing relationship between time and space,confirming boundary parameter,monitoring the slope deformation and slope treatment about open-underground combined mining.