重力坝层间抗滑稳定体系的动力可靠度分析方法

›› 2012, Vol. 33 ›› Issue (10): 3139-3144.

重力坝层间抗滑稳定体系的动力可靠度分析方法

张社荣，王超，孙博

天津大学水利工程仿真与安全国家重点实验室，天津 300072

收稿日期:2011-06-17 出版日期:2012-10-10 发布日期:2012-10-19
作者简介:张社荣，男，1960年生，博士，教授，主要从事水工结构可靠度方面的研究工作
基金资助:
重大水利工程安全性的基础理论研究(No. 51021004)；国家自然科学基金创新研究群体科学基金

Dynamic reliability analysis method of anti-sliding stability between layers of gravity dams

ZHANG She-rong, WANG Chao, SUN Bo

State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China

Received:2011-06-17 Online:2012-10-10 Published:2012-10-19

摘要/Abstract

摘要： 受明显的层状结构影响，加之材料参数和动荷载的双重随机性，动力条件下碾压混凝土重力坝的层间抗滑稳定可靠度问题值得关注。考虑地震波频谱特性、峰值加速度、坝体材料参数的随机性，统计概化出地震作用下坝体的潜在滑动失效路径；在特定地震动作用下，基于随机有限元分析结果，采用刚体极限状态判断准则和响应面法构建失效路径的动力抗滑稳定功能函数，进而求得其抗滑稳定可靠指标；接着考虑不同失效路径的相关性，用Ditlevsen窄界限公式估算体系的可靠度；最后，考虑地震动荷载的随机性，采用基于全概率公式的数值拟合积分方法求解大坝抗滑稳定体系的动力可靠度。研究结果表明，动力条件下，当水平地震系数大于0.2时，重力坝层间抗滑体系可靠度不再由建基面失效路径决定，而是由下游折坡处层面的失效路径决定。该方法数学意义明确，实用性强。

关键词: 水工结构, 碾压混凝土重力坝, 动力体系可靠度, 层间抗滑稳定

Abstract: Due to the randomness of dynamic loads and structural parameters, dynamic reliability of stability between layers of RCC gravity dam deserves the attention. Considering the randomness of spectrum characteristics and peak acceleration of seismic waves as well as material parameters of the dam, potential sliding paths of the dam subjected to earthquake can be identified by generalized statistics; based on stochastic finite element method (SFEM) results, the limit state function of dynamic sliding is built according to rigid limit state criteria and response surface method (RSM) under a certain seismic loading; the reliability index is got as well; then, considering the relativity between different failure paths, the reliability index of the system can be estimated by Ditlevsen narrow-bound method. Finally, the randomness of seismic load is taken into account, the numerical integration method based on complete probability formula is used to get the dynamic system reliability. The results indicate that the system reliability between layers of gravity dam no longer depends on the failure path of the foundation plane, but is closely related to the failure paths at the downstream fold slope when the horizontal earthquake coefficient is greater than 0.2. This method is mathematically clear and practical.

Key words: hydraulic structure, RCC gravity dam, dynamic system reliability, anti-sliding stability between layers

中图分类号:

TV 642.3

张社荣，王超，孙博. 重力坝层间抗滑稳定体系的动力可靠度分析方法[J]. , 2012, 33(10): 3139-3144.

ZHANG She-rong, WANG Chao, SUN Bo. Dynamic reliability analysis method of anti-sliding stability between layers of gravity dams[J]. , 2012, 33(10): 3139-3144.

参考文献

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

本文评价

推荐阅读 10

[1]	刘小文，常立君，胡小荣. 非饱和红土基质吸力与含水率及密度关系试验研究[J]. , 2009, 30(11): 3302 -3306 .
[2]	黄建华，宋二祥. 大型锚碇基础围护工程冻结帷幕力学性态研究[J]. , 2009, 30(11): 3372 -3378 .
[3]	王观石，李长洪，陈保君，李世海. 应力波在非线性结构面介质中的传播规律[J]. , 2009, 30(12): 3747 -3752 .
[4]	王朝阳，许强，倪万魁. 原状黄土CT试验中应力-应变关系的研究[J]. , 2010, 31(2): 387 -391 .
[5]	邓琴，郭明伟，李春光，葛修润. 基于边界元法的边坡矢量和稳定分析[J]. , 2010, 31(6): 1971 -1976 .
[6]	万少石，年廷凯，蒋景彩，栾茂田. 边坡稳定强度折减有限元分析中的若干问题讨论[J]. , 2010, 31(7): 2283 -2288 .
[7]	闫铁，李玮，毕雪亮. 基于分形方法的多孔介质有效应力模型研究[J]. , 2010, 31(8): 2625 -2629 .
[8]	赵尚毅，郑颖人，李安洪，邱文平，唐晓松，徐俊. 多排埋入式抗滑桩在武隆县政府滑坡中的应用[J]. , 2009, 30(S1): 160 -164 .
[9]	刘振平，贺怀建，朱发华. 基于钻孔数据的三维可视化快速建模技术的研究[J]. , 2009, 30(S1): 260 -266 .
[10]	魏厚振，颜荣涛，韦昌富，吴二林，陈盼，田慧会. 含天然气水合物沉积物相平衡问题研究综述[J]. , 2011, 32(8): 2287 -2294 .