汶川地震土石坝震损方向性问题研究  

Researches on the direction problem of earthquake damage of earth-rock fill dams in Wenchuan earthquake

作　　者：梁海安[1] 景立平[1] 李永强[1] 任长青[1] 

机构地区：[1]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《世界地震工程》2010年第S1期197-201,共5页World Earthquake Engineering

基　　金：中央级公益性研究所基本科研业务费专项基金项目(051800309)

摘　　要：文章选取汶川地震中德阳、绵阳两市5个地区内165座水库大坝,对水坝走向、震损数量和震损率进行了统计分析。统计数据表明,汶川地震中多数危重震损的土石坝走向在280°~290,°这与该范围走向的土石坝总数有关,土石坝走向和平均震损率关系并不显著。而土石坝震损率大于50%地震灾区,土石坝走向多垂直或者平行于发震断层走向,土石坝震损率与大坝走向存在一定相关性。文中从汶川地震的震源机制,地震波加速度方向与坝轴夹角等方面分析了产生土石坝震损方向性的原因。165 earth-rock fill dams located in five regions belonging to Deyang and Mianyang cities are analyzed in Wenchuan earthquake.The statistical results show that their strikes for most of the damaged earth-rock fill dams are in the range of 280~290°,because strikes of huge amount of dams are in the range.The relation of damage ratio and strike of dams is not significant.While the damage radio is higher than 50%,high-risk dams' strikes are perpendicular or parallel to the strike of the causative fault.From aspects of focal mechanism of Wenchuan earthquake,the angle of seismic wave acceleration direction and the strikes of dams and so on,some reasons for directional problem of the earthquake damage of the earth-rock dams are explained.

关 键 词：汶川地震 土石坝 水坝走向 震损率 

分 类 号：TV641[水利工程—水利水电工程] TV312