含软弱带岩基上拱坝的应力计算及可靠度分析  

STRESS CALCULATION AND RELIABILITY ANALYSIS OF ARCH DAMS CONSTRUCTED ON ROCK FOUNDATION WITH WEAK ZONE

作　　者：武清玺[1] 陆军[2] 杨明珠[1] 

机构地区：[1]河海大学力学与材料学院,江苏南京210098 [2]江苏省交通科学研究院,江苏南京211112

出　　处：《岩石力学与工程学报》2012年第A01期3098-3103,共6页Chinese Journal of Rock Mechanics and Engineering

摘　　要：拱坝结构的可靠度分析,主要的困难在于考虑坝基岩体材料的不均匀、不连续性,本构模型的弹塑性以及庞大的计算工作量。为解决上述困难,应用弹塑性模型,通过拱坝确定性的应力计算与分析,进一步明确可靠度分析的主要区域和需要研究的关键问题,然后应用响应面技术计算有关区域的可靠度并获得可靠指标的变化规律。在对一拱坝结构计算分析的基础上,针对拱坝建基面和基岩内软弱带区域进行可靠度计算与分析,得出可靠指标的变化规律,验证这一分析方法的正确性和实用性。The main difficulty of reliability analysis of arch dams is due to the rock materials are not continuous, inhomogeneity and its elastoplasticity of the constitutive relations and the huge computation workload. To solve the difficulty above, based on elastoplastic constitutive model, the main region and key problems of structural reliability analysis are determined by structural analysis of the arch dam. Then the reliability index of the region of arch dam and its variation rule are obtained by the technique of response surface method. Based on the structural computation analysis of a arch dam, reliability indices of the basement and weak formation of the arch dam are calculated and the variation rule of reliability index is sketched. The calculated results confirmed the correctness and practicality of the procedure solving the reliability analysis of arch dams.

关 键 词：水利工程 拱坝 软弱带 弹塑性模型 应力计算 可靠度分析 

分 类 号：TV22[水利工程—水工结构工程]