基于点安全系数法的边坡稳定性分析及支护设计

发布时间：2018-04-11 17:59

  本文选题：稳定性分析 + 点安全系数　； 参考：《西南交通大学》2015年硕士论文

【摘要】：边坡工程的稳定性分析是国内外岩土工程领域的一个研究热点。本文以基于位移等值面的点安全系数法为理论依据,借助于FLAC3d三维有限差分软件以及Tecplot数据可视化软件对边坡进行稳定性分析,计算边坡不同的位移等值面相对应的点安全系数和整体安全系数,以整体安全系数作为基准,最小整体安全系数相对应的位移等值面为该边坡的潜在滑动面,同时进行该边坡潜在滑动面的滑动机理分析,找出潜在滑动面上点安全系数与边坡滑动机理之间的关系。本文将这个理论方法运用到丹巴500KV变电站进站公路附近黄土坎滑坡工程中,选取边坡稳定性分析的典型剖面,建立三维分析模型,通过现场勘查以及室内实验,确定模型的计算参数,对典型剖面的三维模型进行稳定性分析,获得的主要成果如下：(1)强变形区Ⅰ区：39mm位移等值面上整体安全系数最小,为1.0866,该位移等值面为边坡的潜在滑动面,强变形区Ⅰ区为推动式滑动机理。(2)弱变形区Ⅱ-1区：39mm位移等值面上整体安全系数最小,为1.1269,该位移等值面为边坡的潜在滑动面,弱变形区Ⅱ-1区为推动式滑动机理。(3)弱变形区Ⅱ-2区：15mm位移等值面上整体安全系数最小,为1.1081,该位移等值面为边坡的潜在滑动面,弱变形区Ⅱ-2区为推动式滑动机理。应用极限平衡理论中的Bishop条分法对边坡的典型剖面进行稳定性分析,计算其安全系数,计算结果分别为1.022,1.055,1.076。综合点安全系数法和极限平衡法的计算结果,分析边坡的稳定性。在边坡稳定性的基础上,依据各变形区的滑动机理,确定抗滑桩的初步位置,根据地勘资料、地形地貌情况,确定抗滑桩的最终位置,并进行抗滑桩的设计验算。
[Abstract]:The stability analysis of slope engineering is a research hotspot in the field of geotechnical engineering at home and abroad.Based on the point safety factor method based on displacement isosurface, the stability of slope is analyzed by means of FLAC3d 3D finite difference software and Tecplot data visualization software.The point safety factor and the overall safety factor corresponding to different displacement equivalent surface of slope are calculated. The displacement equivalent surface corresponding to the minimum overall safety factor is regarded as the potential sliding surface of the slope.At the same time, the slip mechanism of the potential sliding surface of the slope is analyzed, and the relationship between the safety factor of the point on the potential sliding surface and the sliding mechanism of the slope is found out.In this paper, the theory method is applied to the loess landslide project near the entry highway of Danba 500KV substation. The typical section of slope stability analysis is selected, and a three-dimensional analysis model is established.The calculation parameters of the model are determined and the stability of the 3D model of typical section is analyzed. The main results obtained are as follows: 1) the overall safety factor is the smallest on the displacement iso-surface of 10: 39mm in the strong deformation zone.The whole safety factor of the displacement isosurface of area 鈪，

本文编号：1737066