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Research advance in safety analysis methods for high concrete dam

Science China Technological Sciences 2007年第S1期 62-78页

作者： REN QingWen?, XU LanYu & WAN YunHui College of Civil Engineering, Hohai University, Nanjing, 210098, China

high tensile stresses occurred in high concrete dams and in their foundation lead to the growing importance of their safety with the increase of concrete dam height. Without any exiting specification or successful experiences of concrete dams up to 300 m at home and abroad for reference, experts feel obliged to figure out how to perform safety analysis on high concrete dam. This paper involves the main contents and mechanical features of the safety analysis on high concrete dam and shows the current state and progress of the analysis methods. For the insufficiency and problems existing in normative methods, study on modern numerical method such as finite element method must be strengthened to find out the stress control criterion which is in accordance with the methods. Two aspects of the safety analysis of high dam—— local damage from material level and integral destruction from structure level——should be considered. For the local damage, we should consider the non-homogeneity of material and strengthen the research of meso-damage mechanics. While for integral destruction of the system of high dam and its foundation, a study on non-strength theory should receive enough concerns. Further, attention should be paid to the research on the failure modes and criterions of high concrete dam failure analysis and safety evaluation, and the effect of uncertainty and classification of safety should be considered too.

关键词： high concrete dam safety analysis local damage integral destruction

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Seismic safety of high concrete dams

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Earthquake Engineering and Engineering Vibration 2014年第S1期13卷 1-16页

作者： Chen Houqun China Institute of Water Resources and Hydropower Research (IWHR) Professor

China is a country of high seismicity with many hydropower resources. Recently,a series of high arch dams have either been completed or are being constructed in seismic regions,of which most are concrete dams. The evaluation of seismic safety often becomes a critical problem in dam design. In this paper,a brief introduction to major progress in the research on seismic aspects of large concrete dams,conducted mainly at the Institute of Water Resources and Hydropower Research(IWHR) during the past 60 years,is presented. The dam site-specific ground motion input,improved response analysis,dynamic model test verification,field experiment investigations,dynamic behavior of dam concrete,and seismic monitoring and observation are described. Methods to prevent collapse of high concrete dams under maximum credible earthquakes are discussed.

关键词： review and prospect seismic safety high concrete dam dam-foundation-reservoir interaction damage-rupture process

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Observed displacement data-based identification method of deformation time-varying effect of high concrete dams

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Science China(Technological Sciences) 2018年第6期61卷 906-915页

作者： WANG ShaoWei GU ChongShi BAO TengFei l School of Environmental and Safety Engineering Changzhou University Changzhou 213164 China State Key Laboratory of Hydrology-Water Resources andHydraulic Engineering Hohai University Nanjing 210098 China

The long-term safety of high concrete dams has become the focus and central issues of public attention. Deformation is an actual comprehensive reflection of concrete dams. Especially the deformation time-varying effect, is a key index for evaluating the structural behavior, health status, and their evolution of a concrete dam in long-term service. In this paper, causing factors of the deformation time-varying effect of concrete dams were analyzed, and the time-varying effect was divided into two parts, which are the inherent time-varying effect and the time-varying effect caused by the change of dam structural performance. Then, based on the observed dam displacement and the wavelet multi-resolution analysis, causal models for identifying the later deformation time-varying effect and the identification process were proposed. Finally, the efficiency and rationality of the proposed method were verified by two actual concrete dams with runoff reservoir and regulatory reservoir.

关键词： high concrete dam deformation time-varying effect causing analysis identification method

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