Risk-Based Research on Failure Mode of High-Arch Concrete Dam
Risk-Based Research on Failure Mode of High-Arch Concrete Dam
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DOI：
10.4028/www.scientific.net/kem.385-387.269
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发表时间：
2008-07
期刊：
影响因子：
--
通讯作者：
Z. Chen
中科院分区：
文献类型：
--
作者：
Z. Chen
风险分析可以克服常规高拱坝安全评价中忽略荷载的随机性和抗力效应，没有考虑破坏模式和破坏灾害损失的缺点。通过对国内外失稳拱坝和病险拱坝资料的统计分析，得出高拱坝的失稳主要是由超高洪水、高烈度地震、山体滑坡、异常温差、爆炸荷载等引起的，并提出了高拱坝的5种主要失稳模式，即坝肩岩石失稳、基面失稳、整体失稳、超裂缝和极端溢流。在研究主要失效模式失效机理的基础上，建立了计算主要失效模式失效概率的状态函数。提出了一种求取荷载和阻力随机变量的统计量和分布规律的方法。
Risk analysis can overcome the weakness of conventional safety evaluation of high-arch dams where the random nature of the load and resistance effect are ignored and the failure mode and failure disaster loss are not taken into account. On the basis of statistical analysis of the data of the failure arch dams and faulty and perilous arch dams in the world, it is deduced that the failure of high arch dam is mainly caused by super elevation floods, highly intense earthquakes, mountain landslides, abnormal temperature variation, explosion load, etc. Five major failure modes for high arch dams are suggested, namely dam abutment rock instability, fundamental plane instability, entire entity instability, excess cracking and extreme dam overflow. Based on the study of the failure mechanism of the major failure modes, a state function is established to calculate the failure probability of the major failure modes. An approach is developed to obtain the statistical quantity and the regularities of distribution of the load and resistance random variables.