摘要:
开采形成的矿山岩质高陡边坡,造成山体缺损、水土流失、生态破坏,容易产生边坡失稳、崩塌滑落等地质灾害,急需进行生态修复治理。本文以北京市西郊千灵山生态修复岩质高陡边坡为例,根据地质雷达实测剖面分析及室内试验得到的岩体内部结构信息和岩石力学参数,建立了生态边坡的地质力学模型,并用有限元强度折减法对千灵山岩质高陡边坡生态修复前后的稳定性进行了模拟计算。结果表明,非降雨、降雨(饱水)条件下自然岩石边坡和生态修复后的边坡其安全系数分别为17、12.5、5、2;边坡变形以坡脚和生态带区域的中下部位最大,边坡潜在滑动面主要沿坡脚45°方向上扩展。因此,岩石边坡坡脚和生态带区域的中下部位应是重点加固区,需通过锚杆加固和有效排水对之进行处理。
Abstract:
The analysis on high-steep rocky slope stability is a research focus for a long time,because it is considered as the reason why geological disasters occurres,such as slope instability and landslide.Ecological restoration of slope is an urgent issue that can improve environment but may reduce the stability of the whole slope system in some extent.The stability of the ecological slope in Qianlingshan,west suburb of Beijing is analyzed with nonlinear FEM strength reduction method.The interpretation of geological penetrating radar surveying refers to that the rock slope consists of isotropic limestone without obvious fault.The numerical modeling is based on the parameters by rock mechanical experiment,combined with the internal structure of rock mass measured by geological penetrating radar.The safety factors and plastic area distribution and de-formation contours are obtained under different load conditions.The result shows that the safety factors are 17 and 12.5 and 5 and 2 respectively on dry natural slope,dry ecologically-restored slope and saturated natu-ral slope as well as saturated ecologically-restored slope.And that the deformation of slope are biggest on the foot of slope and the middle and lower parts of ecological band,the potential sliding surface mainly ex-tends towards the top of slope along the plane of 45°dip angle.Thus,the basal slope and the middle and lower parts of the ecologic zone are the major reinforcement places and the reinforcement measure should be anchor rod fixation and effective water drainage.
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