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.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第A01期3098-3103,共6页
Chinese Journal of Rock Mechanics and Engineering
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
hydraulic engineering
arch dam
weak zone
elastoplastic model
stress calculation
reliabilityanalysis
