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Relationships between damage extent and geometry of reservoir's earth dams in Wenchuan earthquake

YE Yasan1,2,CHEN Guoxing1,2,WANG Zhihua1,2(1.Institute of Geotechnical Engineering,Nanjing University of Technology,Nanjing 210009,China; 2.Civil Engineering & Earthquake Disaster Prevention Center of Jiangsu Province,Nanjing 210009,China)  
Based on the investigation and analysis of 147 high-risk earth dams in Wenchuan earthquake,the earthquake damage extent was divided into three levels: medium damage,serious damage and very serious damage.The empirical relationship among earthquake damage extent,earthquake intensity,aspect ratio,upstream slope ratio and height of earth dam was obtained.It was found that the geometry of the dam has an important effect on earthquake damage extent.For earthquake intensity 6~8,the smaller aspect ratio or the smaller upstream slope ratio or the greater height the earth dams had,the more serious the earthquake damage would be;for earthquake intensity above 9,the earth dams were generally damaged very seriously.Based on the seismic response analysis of the earth dams,the empirical relationship among earthquake damage extent,aspect ratio,upstream slope ratio,height of earth dams and acceleration amplification factor on dam crest,and the maximum dynamic shear stress in dam body were given.It could be seen that at the same earthquake intensity level,the smaller the aspect ratio or the smaller the upstream slope ratio or the higher the earth dams,and the greater the acceleration amplification factor on dam crest or the higher the dynamic shear stress in dam body,the more serious the earthquake damage.When the maximum dynamic shear stress in dam body is higher than 30 kPa,the dam was damaged seriously or very seriously.When the maximum dynamic shear stress in dam body is higher than 100 kPa,the dam was damaged very seriously.The farther the dam was located from the causative fault,the greater the acceleration amplification factor on dam crest was.In this paper,the empirical relationships between the damage extent and the geometry of the high-risk earth dams were established,which could give references for the seismic design of dams in the future.
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