基于CDEM露天煤矿顺倾软岩边坡三维稳定性分析

为解决露天煤矿顺倾层状软岩边坡稳定性这一技术难题,基于连续介质离散元数值模拟方法,从理论上探讨了降深与清帮至不同位置对顺倾软岩边坡稳定性的影响。结合白音华一号矿南帮工程实例,针对各煤层降深及清帮方案,基于CDEM数值算法对边坡稳定性进行计算,对比分析了坡体位移、应力分布及演化特征,进而阐明多个弱层对复合边坡产生的叠加效应,以及清帮减载对边坡稳定性的影响。结果表明,白音华一号矿首采区南帮边坡变形不会对南排土场稳定性造成影响,揭露多个弱层对边坡变形与稳定性下降有一定的叠加效应,清帮不能显著提高边坡稳定性,但可减小作用在弱层上的法向应力和剪切应力,进而减缓滑坡发生的过程,提高边坡动态发展过程中的安全性。

3-D stability analysis of the soft rock slope in the open-pit coal mine based on the numerical algorithm CDEM

The present article is inclined to solve the chronically technical problem related to the slope stability of the dip-bedded layered soft rock in the case of open-pit coal mines. Based on the discrete element numerical simulation method of the continuous medium,it is necessary to make a theoretical discussion of the influence and effect of deepening and clearing of the different locations on the stability of the dip-bedded soft rock slopes in such opencast coal mines. The present paper is inclined to make an analysis of such a case based on the CDEM numerical algorithm in combination with the engineering example from the south slope of Bai Yin Hua No. 1 open-pit coal mine in accordance with the deepening of each coal seam and clearing slope scheme when analyzing the related evolution characteristics of slope and the displacement of the slope mass by comparing the distributions of the slope stress. To illustrate the superposition effect of some weak layers on the composite slope,we have made a detailed analysis of the influence on the slope ability by reducing the load of slope. For the above said research purpose of the given paper,we have to illustrate and display the deformation situation of the initially exploited area of the south slope of the coal mine,which may not impact the stability of the southern waste dump. At the same time,we have also found that a superposition effect has been made by the multiple weak layers on the slope deformation and the destabilization at a certain degree. This may suggest that the procedure of the slope cleaning up wouldn’t make significant effect on the stability of the slope,though it may effectively reduce the normal stress and the shear stress on the weak layer. At the same time,the liability taking place with the landslide can be slowed down due to improvement of the safety of slope dynamic strengthening.