谢京辉,雷〓倩,陈灯红,杨紫辉.基于扩展有限元法的混凝土重力坝裂纹扩展研究[J].水电能源科学,2018,36(6):64-67
基于扩展有限元法的混凝土重力坝裂纹扩展研究
Study on Crack Propagation of Concrete Gravity Dam Based on XFEM
  
DOI:
中文关键词:  混凝土重力坝  扩展有限元法  粘弹性边界  流固耦合  裂纹扩展
英文关键词:concrete gravity dam  XFEM  viscous spring boundary  fluid solid coupling  crack propagation
基金项目:国家自然科学基金项目(51309143);三峡大学科学基金(KJ2013B003);防灾减灾湖北省重点实验室(三峡大学)〖JP3〗开放研究基金项目(2016KJZ17);三峡大学研究生创新基金(SDYC2016019);三峡大学硕士论文培优基金(2017YPY020)
作者单位
谢京辉,雷〓倩,陈灯红,杨紫辉 三峡大学 土木与建筑学院 湖北 宜昌 443002 
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中文摘要:
      针对混凝土重力坝裂纹开裂扩展问题,基于扩展有限元(XFEM)理论,以Koyna大坝为例,分别建立基于附加质量法和无质量地基法的传统抗震分析模型和基于流固耦合法和粘弹性边界法的新型抗震分析模型,并针对两种模型进行线性时程分析和非线性裂纹扩展模拟分析。结果表明,以流固耦合法和粘弹性边界法建立的坝体-地基-库水抗震分析模型的动力峰值响应整体减小了约30%;传统模型的裂缝张开位移有一定程度的夸大,基于流固耦合法和粘弹性边界法建立的坝体-地基-库水抗震分析模型的裂纹扩展路径与实际振动台试验结果更接近。
英文摘要:
      Based on the extended finite element theory(XFEM)and taking the Koyna dam as an example, the traditional seismic analysis model based the additional mass method and the massless foundation method were established. And then a new seismic analysis model of the dam foundation reservoir model was established by using the fluid solid coupling method and the viscoelastic boundary method. The linear time history analysis and nonlinear crack propagation were simulated by the two models. The results show that the peak value of the dynamic model is reduced by about 30%. The fracture displacement of the traditional model is a certain degree of exaggeration. The crack propagation path of the dam foundation reservoir seismic analysis model is closer to the actual vibration table test results.
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