Arch-dam crack deformation monitoring hybrid model based on XFEM  

作　　者：ZHENG DongJian HUO ZhongYan LI Bo 

机构地区：[1]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China [2]National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety,Hohai University,Nanjing 210098,China [3]College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China [4]Changing River Scientific Institute,Engineering Safety and Disaster Prevention Institute,Wuhan 430010,China

出　　处：《Science China(Technological Sciences)》2011年第10期2611-2617,共7页中国科学(技术科学英文版)

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 50879024,50909041);Special Fund of State Key Laboratory of China (Grant Nos. 2009586012,2010585212) ;the Fun-damental Research Funds for the Central Universities (Grant Nos. 2009B08514,2010B20414)

摘　　要：An extended finite element method incorporated with the cohesive crack model(CCM-based XFEM) is developed in consideration of crack tip enrichment.It could improve the accuracy and is introduced into dam safety monitoring for the first time.Firstly,the proposed method is verified for a benchmark concrete beam by comparing the results with those of numerical investigations obtained by other researchers.Furthermore,it is adopted as an alternative method for building the deformation hybrid models of non-stable cracks in an arc dam,for the reason that classical FEMs are cumbersome in modeling the cohesive crack growth due to the need of remeshing the moving discontinuities.Case study proves that the fitted results of the mentioned deformation hybrid model,better than the classical statistical model,are well consistent with the measured data and reliable to forecast the development tendency of crack deformation.Therefore,the present CCM-based XFEM could provide a practical way to simulate and monitor the cracking process in concrete arch dam.

关 键 词：XFEM cohesive crack model concrete arch dam hybrid model 

分 类 号：TV698.11[水利工程—水利水电工程] TV642.4