重力坝深层抗滑稳定接触非线性有限元分析  

Nonlinear FEM Analysis of Stability against Deep Layer Sliding Contact of Concrete Gravity Dam

作　　者：肖妮[1] 刘晓青[1] 齐慧君[1] 张石[1] 

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《水电能源科学》2014年第10期78-81,77,共5页Water Resources and Power

基　　金：国家"十二五"科技支撑计划课题(2012BAK10B04)

摘　　要：鉴于复杂地基上重力坝深层抗滑稳定分析传统算法的局限性,将接触问题引入重力坝深层抗滑稳定分析中,验算大坝抗滑稳定性。针对某重力坝工程地质条件和受力特点,建立有限元接触模型,考虑接触非线性的特性和法向应力与剪应力之间的交叉影响,提出基于强度折减法的接触非线性有限元算法,对预设缝进行整体降强,根据坝基特征点突变并结合接触缝滑移连通情况确定深层滑动面及稳定安全系数,并与传统算法计算结果进行比较。结果表明,接触算法具有自动搜索危险滑面、计算量少、收敛性好的优点。In view of the limitations of traditional algorithm on the analysis of deep anti-sliding stability of concrete gravity dam in complexity foundation, contact problem is introduced to analyze deep sliding stability of gravity dam. According to the geological conditions and mechanical characteristics of a certain gravity dam, a finite element contact model is established. Considering the characteristics of contact nonlinear and cross impact between normal stress and shear stress, contact nonlinear finite element method is put forward base on the strength reduction method. Combining sliding connection of contact crack, unstable contact surface and safety factor are determined by reducing the overall strength of pre-set contact crack in the dam foundation. Compared with the results calculate by the traditional algorithm, it shows that the contact algorithm has advantages of automatic search of dangerous slippery surfaces, less computing and good convergence.

关 键 词：重力坝 抗滑稳定 非线性有限元 接触 

分 类 号：TV642.3[水利工程—水利水电工程] TU45[建筑科学—岩土工程]