水利学报2017，Vol.48Issue(1)：70-77,8.DOI:10.13243/j.cnki.slxb.20160649
伸缩缝防渗结构聚脲基涂层剥离破坏研究
Study on the polyurea-coat debonding failure of impervious structurein contractionjoints
李炳奇 1张宇弛 1刘小楠 2李泽阳3
作者信息
- 1. 中国水利水电科学研究院结构材料研究所,北京100038
- 2. 北京化工大学理学院,北京100029
- 3. 曼彻斯特大学数学系,曼彻斯特M139PL
- 折叠
摘要
Abstract
Leakage failure of contractionjoints is extensively found in hydraulic structures and the studies on the failure mechanism are urgently needed to guarantee the regular service and maintenance of these structures.In this paper,based on the South-to-North Water Diversion Project and the damage and fracture mechanics,the finite element method with.cohesive zone model(CZM)is used to analyze the failure process of polyurea-composite impervious coat in the contraction joints.According to the load-displacement deformation data obtained from impervious coat debonding experiments,the interface stiffness and viscosity coefficient for the adhesive layer cohesive elements are calibrated.In the numerical examples,we determine the critical loads of debonding of the coat and we also discuss the effect of the thickness of polyurea-composite impervious coat on debonding critical loads.Furthermore,the effects of the thickness,elasticity modulus of coat and shear stress of cohesive elements on the lengthof coat debonding when the water pressure is applied on the open contraction joint are included in our discussion as well.The numerical results show the consistency of debonding loads obtained from FEM simulation and experiments,which demonstrate the rationality of the parameters of the CZM and the validity of the mechanism of polyurea-composite impervious coat debonding failure.From the analysis results for the case that the water pressure is applied on the opened contraction joint,the proposed method for the failure analysis of the polyurea-composite impervious coatcanbe used for quantitatively reference to the impervious design of contraction joints.关键词
内聚力/有限元/伸缩缝/聚脲基复合防渗体系/涂层剥离/水压力Key words
cohesivezone model/FEM/contraction joints/polyurea-composite impervious system/coat debonding/water pressure分类
建筑与水利引用本文复制引用
李炳奇,张宇弛,刘小楠,李泽阳..伸缩缝防渗结构聚脲基涂层剥离破坏研究[J].水利学报,2017,48(1):70-77,8.
