用有限元强度折减法求算边坡安全系数初探  

The Primary Study on Safety Coefficient of Slope by Strength Reduction Finite Element Method

作　　者：熊传治[1] 杜维吾[1] 彭状[1] 孙晓然[1] 王新建[1] 

机构地区：[1]长沙矿冶研究院,湖南长沙410012

出　　处：《矿冶工程》2008年第2期13-16,共4页Mining and Metallurgical Engineering

摘　　要：对非均质边坡岩体失稳用有限元强度折减法开展了初步分析研究,对已有文献提出的3条失稳判断之一进行了修正,即坡面位移矢量方向应反映相应滑面点的切线方向。结合可可托海露天矿的强度折减法实例,得到的4点初步结论是:①用有限元强度折减法计算边坡安全系数不需要事先确定滑动面的位置。②对非均质边坡在影响等效塑性区的连通方面粘结力C?内摩擦角φ值的影响很大。③坡面位移矢量要反映相应滑面点的滑弧的切线方向。④对非均质具有断裂面的岩体用有限元强度折减法进行边坡失稳判断还有许多问题要探索。A primary study has been done on the strength reduction finite element method for the losing stability in nonhomogeneous slop. One of 3 criteria for losing stability which have proposed in other documents is modified, that is the direction of the total displacement vectors on slope surface should reflect the tangent direction of relative point on sliding face. Based on the practical experience of using strength reduction finite element method in KeKetuohai open pit slope stability analysis, 4 primary conclusions have been obtained. （1） The position of sliding face will not set in advance if safety coefficient of slope is calculated by the strength reduction finite element method. （2） For non-homogeneous slope, the values of C, ~o have most influence on the linking area of equivalent plastic area. （3） The displacement vector on the slope face should reflect the curved tangent direction of the certain point located on the sliding face. （4） Whether the stabilities of the slop with non-homogeneous fissured rock can be evaluated with strength reduction finite element method needs further discussion.

关 键 词：非均质边坡 有限元强度折减法 极限平衡分析 边坡安全系数 

分 类 号：O242[理学—计算数学]