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高土石坝极限抗震能力的评判角度及标准述评 被引量:8

Evaluation Perspectives and Criteria of Maximum Aseismic Capability for High Earth-rock Dam
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摘要 汶川地震后,我国对设计高土石坝提出了分析评价其极限抗震能力的要求。目前全面深入的评价方法,是从坝坡稳定、地震残余变形、液化安全性和防渗混凝土结构应力状态等方面,运用数值分析和动力离心模型试验的方法,综合判定高土石坝的极限抗震能力,长河坝心墙堆石坝工程首次采用了此综合评价方法。然而此类评判目前没有统一的判定标准,探求其原因,认为是数值或物理模拟方法不能十分真实地模拟实际情况、分析方法细节和验证实例资料的局限性、研究者的经验认识不同等。从这些原因的位置探求一些减少标准差异的评价方法,如边坡稳定分析时,取滑块的最大厚度不小于5m;混凝土防渗墙的应力评判应细化到抗压强度和抗拉强度,并研究提出相应评判标准,依据新的评价方法建议了评价标准。 After Wenchuan earthquake,evaluation of maximum aseismic capability of high earthrock dam is required in China.Till now the comprehensive and thorough evaluation is done from the perspectives of dynamic stability of dam slope,earthquake-induced permanent deformation, liquefaction safety,the stress state in concrete seepage structure,and so on,synthetically by both numerical method and physical model test,and this evaluation method is first applied in Changheba earth core rockfill dam project.Yet at present there are no uniform evaluation criteria,and the reason is found to be that numerical method and physical model test cannot fully simulate the reality,limitation of details of analysis method and earthquake damage information,and researchers′different understanding.New approaches are put forward to decrease the divergence of the criteria,for example,in slope stability analysis,the maximum thickness of the slope is stipulated to be no smaller than 5m,and in stress analysis of concrete cutoff wall,both the compressive strength and tensile strength should be considered,and relevant stress criteria is proposed.New criteria are suggested.
作者 田景元 刘汉龙 伍小玉 TIAN Jing-yuan;LIU Han-long;WU Xiao-Yu;Chengdu Hydroelectric Investigation and Design Institute;Geotechnical Research Institute,Hohai University;
出处 《防灾减灾工程学报》 CSCD 北大核心 2013年第S1期128-131,137共5页 Journal of Disaster Prevent and Mitigation Eng
关键词 高土石坝 极限抗震能力 动力离心模型试验 地震残余变形 坝坡稳定 high earth-rock dam maximum aseismic capability dynamic centrifuge model test earthquake-induced permanent deformation dynamic stability of dam slope
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