基于扩展有限元法的含纵向裂缝重力坝破坏分析  

Failure analysis of gravity dams with existing cracks based on extended finite element method

作　　者：潘坚文[1] 张楚汉[1] 金峰[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水力发电学报》2011年第3期138-144,共7页Journal of Hydroelectric Engineering

基　　金：国家"973"计划(2007CB714108);清华大学水沙科学与水利水电工程国家重点实验室自主研究课题(2008-TC-2)

摘　　要：采用扩展有限元法(XFEM)计算分析含纵向裂缝重力坝在水压超载作用下的破坏模式,研究坝内裂缝对重力坝超载系数的影响。结果表明,重力坝在水压超载的破坏失稳行为表现为脆性和突发性,达到一定超载水压出现坝体裂缝,然后裂缝迅速贯穿坝体,导致坝体失稳。纵向裂缝的存在显著降低重力坝的整体刚度与安全系数。An extended finite element method（FEM） is adopted to analyze the crack propagation process for evaluating the overloading capacity of gravity dams with longitudinal interior cracks.Influence of existing cracks in dams on their failure modes and safety factors of gravity dams under overloading are demonstrated.The crack process behaves that when cracks propagate in dams,they will extend rapidly through the whole section of the dam from upstream to downstream face and a sudden failure of the dam appears to happen.It is also found that the existing cracks significantly reduce the integral rigidity and loading capacity of the dam.

关 键 词：水工结构 破坏模式 扩展有限元法 带纵向裂缝重力坝 失稳 

分 类 号：TV31[水利工程—水工结构工程]