基于强度折减有限元法分析边坡稳定性  

Analyzing slope stability based on strength reduction finite element method

作　　者：周薛淼 Zhou Xuemiao(No.240 Research Institute of Nuclear,Shenyang 110136,China)

机构地区：[1]核工业二四0研究所,辽宁沈阳110136

出　　处：《山西建筑》2023年第11期89-92,96,共5页Shanxi Architecture

摘　　要：针对目前普遍采用传统极限分析法对边坡进行稳定性分析存在不考虑土体内部的应力-应变关系,且无法了解边坡的渐进变形和滑动破坏之间存在何种关系,基于大型通用有限元软件ABAQUS软件,根据强度折减法概念、弹塑性有限元技术原理以及极限平衡原理,提出了一种权衡实用性与精准性的边坡安全系数计算方法。通过对实际工程中的土质边坡稳定性进行了分析,并以场变量的形式将折减系数赋值给ABAQUS,能够利用ABAQUS动态图形显示功能了解边坡塑性区的形成和演化过程。当塑性区从坡脚到坡顶贯通,并且伴随着位移和应变发生突变时,则此时边坡就处于临界破坏状态,取该折减系数的值作为边坡的最小稳定安全系数。结果表明,与传统极限平衡法相比,采用ABAQUS强度有限元法计算的安全系数值略高于前者计算的结果,但差异不大。该方法能够准确预测滑动面位置和精确算出稳定安全系数,适用于工程实践。In view of the fact that the conventional limit analysis method is commonly used to analyze the stability of slope without considering the stress-strain relationship in soil and failing to understand the relationship between progressive deformation and sliding failure of slope,based on the large general finite element software ABAQUS,based on the concept of strength reduction,the principle of elastic-plastic finite element technology and the principle of limit equilibrium,This paper presents a calculation method of slope safety factor which balances practicability and accuracy.By analyzing the stability of soil slope in actual engineering and assigning the reduction coefficient to ABAQUS in the form of field variable,the formation and evolution process of slope plastic zone can be understood by using ABAQUS dynamic graph display function.When the plastic zone is connected from the foot to the top of the slope and sudden changes occur along with displacement and strain,then the slope is in a critical failure state.The value of this reduction coefficient is taken as the minimum stability safety factor of the slope.The results show that compared with the traditional limit equilibrium method,the safety factor value calculated by ABAQUS strength finite element method is slightly higher than that calculated by the former method,but the difference is not significant.This method can accurately predict the position of sliding surface and calculate the stability and safety factor,which is suitable for engineering practice.

关 键 词：ABAQUS软件 强度折减法 安全系数 边坡 

分 类 号：TU457[建筑科学—岩土工程]