基于分项系数有限元法的观音岩大坝深层抗滑稳定分析  

Analysis of Anti-sliding Stability in Deep Foundation of Guanyingyan Gravity Dam Based on Partial Coefficient FEM

作　　者：来志强[1,2] 常晓林[1,2] 程勇刚[1,2] 周伟[1,2] 杨利福[1,2] LAI Zhiqiang CHANG Xiaolin CHENG Yonggang ZHOU Wei YANG Lifu(State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, Hubei, China Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, Hubei, China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072

出　　处：《水力发电》2017年第1期30-34,共5页Water Power

摘　　要：材料强度储备系数法在重力坝深层抗滑稳定分析中得到了普遍应用,但该方法未考虑荷载的不确定性,且认为岩体强度可以无限度的降低,其安全系数不能表达坝基实际的可靠度。在分项系数有限元法的基础上提出了一种新的重力坝深层抗滑稳定计算方法——有界降强分项系数法,该方法将影响坝基稳定的变量经分项系数处理后,采用强度储备系数法考虑岩体强度可能的弱化,并以相同岩体抗剪参数的统计规律来控制其弱化下界。采用该方法对观音岩重力坝11号坝段进行了深层抗滑稳定分析,并与传统方法计算结果进行对比,结果表明:所提方法计算的安全系数比分项系数有限元法略大,不同方法计算所得大坝稳定性是一致的,说明所提方法应用于重力坝深层抗滑稳定是合理可行的。The material strength reserve coefficient method is generally applied in the analysis of anti-sliding stability in deep foundation of gravity dam, but the uncertainties of load are not considered and the strength of rock mass is also considered to be decreased limitlessly, so the dam final stability index cannot be defined by the strength reserve safety coefficient. A new approach based on finite element method-bounded reduction partial coefficient finite element method is proposed for gravity dam stability analysis, in which, the possible weakening of rock strength is considered by strength reserve coefficient method after the variables influencing the stability of dam foundation are processed by partial coefficient and the lower bound of rock is controlled based on the statistical law of shear strength parameters of same rock mass of dam foundation. The results from the 1 lth monolith of Guanyingyan Gravity Dam indicate that the safety coefficient based on proposed method is somewhat larger than that based on partial coefficient finite element method, and the results based on different methods are same, which show that the proposed approach is reasonable and feasible.

关 键 词：重力坝 深层抗滑稳定 分项系数法 强度储备系数法 有界降强 观音岩水电站 

分 类 号：TV223[水利工程—水工结构工程]