基于强度折减法的重力坝坝基软弱结构面失稳判据研究  

Study on Instability Criterion for Weak Structure Plane of Gravity Dam Foundation Based on Strength Reduction Method

作　　者：聂彦春[1] 王刚[1] 马震岳[1] 朱贺[1] 

机构地区：[1]大连理工大学建设工程学部水利工程学院,辽宁大连116024

出　　处：《水利与建筑工程学报》2013年第4期13-16,37,共5页Journal of Water Resources and Architectural Engineering

基　　金："十一五"国家科技支撑计划资助项目(2008BAB29B03);中央高校基本科研业务费专项资金资助

摘　　要：以某混凝土重力坝坝基失稳问题为例,采用非线性有限元强度折减法,对三种典型的失稳判据进行数值计算研究,并与传统的刚体极限平衡法计算结果进行对比,讨论各种失稳判据的合理性及其适用性。研究结果表明:采用收敛性判据误差相对较大,采用特征点位移突变和塑性区贯通作为失稳判据所得安全系数与刚体极限平衡法所得安全系数较为接近。验证了位移突变判据和塑性区贯通判据的合理性。建议在强度折减法的重力坝坝基失稳分析中联合使用位移突变判据和塑性区贯通判据。Taking the instability problem of a concrete gravity dam foundation as an example and by using the nonlinear finite element strength reduction method,three typical instability criteria are studied here in numerical calculation,and the results are compared with those from the traditional rigid limit equilibrium method,by which,the applicability and rationality of various instability criteria are discussed.The results show that the using of convergent criterion produces a larger error,and the safety coefficient calculated by using the displacement mutation criterion and plastic zone penetrating criterion is close to that by the rigid limit equilibrium method,which verifies the rationality of the displacement mutation criterion and plastic zone penetrating criterion.At last,it is recommended that the displacement mutation criterion and plastic zone penetrating criterion should be considered in the stability analysis of gravity dam foundation.

关 键 词：重力坝 软弱结构面 强度折减法 失稳判据 非线性 

分 类 号：TV642.3[水利工程—水利水电工程]