Main Participants: CHEN Houqun, LI Deyu, HU Xiao, LIU Xiaosheng, WANG Haibo, ZHAO Jianming, ZHANG Yanhong, ZHANG Boyan, WANG Zhongning, TU Jin, LI Min, ZHANG Cuiran, OUYANG Jinhui, MA Huaifa

After the Wenchuan earthquake, in order to meet the state’s requirement that the dam does not break under the maximum credible earthquake and ensure national public safety, this standard is developed on the basis of lessons learned from Wenchuan earthquake and seismic research achievements of hydraulic structures.

·   Using the ultimate limit state design method expressed by the partial factor to calculate the seismic structural factor γ_d for various hydraulic structures.

·   Revising the parameters of standard design response spectrum on bedrock for ordinary engineering.

·   Adding the requirement that the site’s maximum credible earthquake should be determined according to the deterministic method or the probability method with an exceeding probability of 1% within 100 years of the reference period for the hydraulic structures with the engineering seismic protection category A, and that the special demonstration on its safety margin under maximum credible earthquake shall be carried out on disaster prevention of the uncontrolled release of reservoir.

·   Specifying the dynamic analysis considerations of concrete gravity dam and arch dam with seismic protection category A.

·   Stipulating that the dynamic analysis and safety evaluation using finite element method should be conducted for dam body and its foundation of embankment dam.

·   Revising the characteristic values of dynamic strength and elastic modulus of dam concrete.

·   Adding the seismic design rules for aqueducts, ship lifts and slopes.

·   Having developed the seismic prevention framework with two levels for important dam in which only repairable dam damage occurs under the design seismic action, and no uncontrolled release of reservoir water occurs under the maximum credible earthquake.

·   Having proposed the method of determining the site-specific design response spectrum by scenario earthquake method for hydraulic structures with seismic protection category A and the method of determining the maximum credible earthquake by considering the surface source rupture process under the condition of large near-fault earthquake. (Fig. 1)

·   Having put forward a constitutive model for dam concrete dynamic damage based on concrete test data and independently developed a parallel computing program for seismic damage and failure analysis of concrete dam -foundation system based on domain decomposition algorithm and high performance computing platform. (Fig. 2)

·   Having revealed the failure mechanism and corresponding seismic safety limit state of the dam under the maximum credible earthquake and built the quantitative evaluation index system of no uncontrolled release of reservoir water under the maximum credible earthquake. (Fig. 3)

These achievements have been applied to the seismic safety review of China’s high dams over 150m, including the Three Gorges Hydropower Station,  Xiluodu Hydropower Station, Wudongde Hydropower Station, Baihetan Hydropower Station, Xulong Hydropower Station, Benzilan Hydropower Station, Yebatan Hydropower Station, Lianghekou Hydropower Station, Shuangjiangkou Hydropower Station, Jinping I Hydropower Station, Dagangshan Hydropower Station, Mengdigou Hydropower Station, Ludila Hydropower Station, Longyangxia Hydropower Station, as well as the seismic design of high dams under construction in China.

Fig. 1 Design Response Spectrum Determined by Scenario Earthquake Method and Maximum Credible Earthquake Determined by Stochastic Finite Faults Method

Fig. 2 Dynamic Damage Constitutive Model of Dam Concrete and High-performance Parallel Computing Software

Fig. 3 Failure Mechanism of Dam under Strong Earthquake and Quantitative Index System of No Uncontrolled Release of Reservoir Water