文章摘要
李世强, 宋志强, 姚倩茹, 刘 琛, 刘云贺.地震动和结构参数双重随机的重力坝抗滑稳定可靠度分析Journal of Water Resources and Water Engineering[J].,2022,33(5):148-153
地震动和结构参数双重随机的重力坝抗滑稳定可靠度分析
Reliability analysis of anti-sliding stability of gravity dams under double random situation of seismic motion and structural parameters
  
DOI:10.11705/j.issn.1672-643X.2022.05.18
中文关键词: 重力坝  抗滑稳定  随机地震动  随机结构参数  可靠度分析
英文关键词: gravity dam  anti-sliding stability  random seismic motion  random structural parameter  reliability analysis
基金项目:国家自然科学基金项目(51479165)
Author NameAffiliation
LI Shiqiang1, SONG Zhiqiang1, YAO Qianru1, LIU Chen2, LIU Yunhe1 (1.西安理工大学 省部共建西北旱区生态水利国家重点实验室, 陕西 西安 7100482.中铁第一勘察设计院集团有限公司 陕西 西安 710043) 
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中文摘要:
      地震动和坝体结构参数的随机性均对重力坝抗滑稳定可靠度有重要影响。首先建立了重力坝建基面抗滑稳定极限状态方程,将坝体水平和竖向惯性力随机过程的最大值作为随机变量,根据随机过程参数获得此随机变量的均值和方差,实现了将地震荷载和结构参数双重随机性问题统一到随机变量模式下;然后采用JC法分析了某实际工程重力坝建基面抗滑稳定可靠度,并结合地震发生的概率分析了该重力坝抗滑稳定的失效概率;最后采用正交试验法分析了各结构随机参数对可靠度和失效概率的敏感性。结果表明:本文提出将随机过程最大值作为随机变量的方法可以用于地震动和结构参数双重随机情况下的重力坝抗滑稳定可靠度分析;实例工程混凝土重力坝沿建基面抗滑稳定可靠指标为4.23,失效概率为0.001 17%;坝体材料密度、地基泊松比以及建基面黏聚力系数和摩擦系数对可靠度计算结果影响较为显著。
英文摘要:
      Both the randomness of the seismic motion and the dam structural parameters have an important impact on the stability and reliability of gravity dams. In this paper, the anti-sliding stability limit state equation of the construction foundation surface of gravity dam was established, with the maximum values of the horizontal and vertical inertial force of the dam body in the stochastic process as the random variables. By the determination of the mean and variance of the random variables according to the parameters of the stochastic process, the dual randomness problems of seismic load and structural parameters were merged into one random variable mode. Then, the JC method was used to analyze the reliability of the anti-sliding stability of the foundation surface of a gravity dam in an actual project, and the failure probability of the anti-sliding stability of the gravity dam was analyzed based on the probability of earthquake occurrence. Finally, the sensitivity of random parameters of each structure to reliability and failure probability was analyzed by orthogonal test method. The results show that the proposed method with the maximum value of the stochastic process as the random variable can be used for the analysis of the reliability of the anti-sliding stability of gravity dams under the double random situation of seismic motion and structural parameters. The reliable index of anti-sliding stability along the foundation surface of this concrete gravity dam was 4.23, the failure probability was 0.001 17%. The friction coefficient of the foundation surface, the coefficient of cohesion and the density of the dam material had a significant impact on the reliability calculation results.
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