2008年汶川地震中沙牌拱坝的震情检验和分析

为对2008年汶川地震中沙牌拱坝的震情进行检验和分析,本文提出了一个基于损伤力学对高混凝土坝地震损伤破坏过程分析的新方法,可计入残余变形但避免损伤—塑性耦合。由于汶川地震中未能取得坝址的地震动输入记录,为此,采用随机有限断层法,通过邻近台站的加速度记录,对汶川地震中断层破裂模型参数进行校准后,重建了汶川地震中沙牌拱坝坝址的地震动输入加速度时程。为上述计算研发了高性能并行计算程序,在"天河一号"超级计算机上进行了高效运算,并对都经受过强震的沙牌拱坝和美国帕柯依玛拱坝的震情进行了对比分析。计算结果表明,所建议的方法能可靠应用于混凝土坝的地震损伤破坏过程的分析。

Analysis and verification of seismic behavior of Shapai RCC Arch Dam During 2008 Wenchuan Earthquake

In order to analyze and verify the seismic behavior of Shapai RCC Arch Dam during 2008 Wenchuan Earthquake，a damage mechanics-based new approach，which can take the residual deformation into account without plastic-damage coupling，for analyzing seismic damage rupture process of high concrete dam is proposed herein.As no any ground motion inputs at the dam site during Wenchuan Earthquake are recorded，the acceleration time-history of ground motion input of the site for Shapai RCC Arch Dam during the earthquake is restablished with the stochastic finite-fault method after calibrating the parameters for the fault-rupture model of Wenchuan Earthquake in accordance with the acceleration recordings from the adjacent seismic stations. With the calculation mentioned above，a high performance parallel program is developed，and then a high efficient computation is carried out on Tianhe-I Supercomputer. Furthermore，a comparative analysis is made on both Shapai RCC Arch Dam and Pacoima Arch Dam in USA those ever suffered strong earthquakes. The computation result shows that the proposed approach can be reliably applied to the analysis of the seismic damage rupture process of concrete dam.