“5.12”汶川大地震时冶勒大坝实测动力反应

Recorded seismic response of Yele Dam during "5.12" Wenchuan Earthquake

2008年5月12日14时28分四川汶川发生M8.0级大地震,冶勒大坝距震中汶川约258公里,具有强烈震感,大坝的强震监测台阵对此次大地震有较完整的有效数据记录。针对这些实测地震记录,采用时程分析方法和频谱分析方法分析大坝的地震反应特征和规律,并结合其它监测资料,考察了此次大地震对冶勒大坝所产生的影响,认为冶勒大坝在震后运行性态稳定,情况基本正常。此外,将此次地震记录与以往监测的地震记录进行对比分析,获得了冶勒大坝与一般土石坝不同的地震动力反应规律,这种特殊规律与冶勒大坝特殊的地质条件密切相关。

A disastrous M8.0 earthquake happened in Wenchuan, Sichuan Province at 14：28 on May 12, 2008. The Yele Dam site was shocked strongly at an epicentral distance of about 258 kilometers. The monitoring station on the dam obtained comparatively complete records of ＂5.12＂ Wenchuan Earthquake. Based on the earthquake records of Yele Dam, its seismic response were analyzed by use of the time history method and the spectral analysis method. Combined with the analysis of monitored data of other earthquakes, the effects of the Wenchuan Earthquake on Yele Dam was studied. It was concluded that Yele Dam remained in normal working state after the great Earthquake. Moreover, through the contrastive analysis of dynamic response between ＂5.12＂ Wenchuan earthquake and the previous ones, some distinct seismic response laws of Yele Dam were acquired, and they were closely associated with its peculiar geological condition.