水利学报2017，Vol.48Issue(10)：1167-1174,1184,9.DOI:10.13243/j.cnki.slxb.20170612
不同缝面形态下诱导缝开裂效果对比研究
Comparative study on effect of induced joints of different interface patterns
摘要
Abstract
Induced joints are commonly used to control cracks in the design of RCC arch dam.At present,Radial twist stitches are used in some projects.In those projects,it occurred that cracks appeared around the induced jointsbut the joint itself is not open during the construction period.In the view of fracture mechanics,it is about the split of induced joints under different interfaces.In this paper,a tutorial of a finite plate containing different interface patterns of joint cracks and a cylindrical arch dam is set,based on the stress change characteristics of RCC arch dam and the law of induced crack change,using virtual crack closure technique and Richard brittle fracture criteria to obtain equivalent Stress Intensity Factor of interface and study on the law of variation of crack intensity factor following the joint angle change.In order to acquire the effect of induced jointsfor different interface patterns,correction coefficient of equivalent strength namely theinterface space form factors λ(θ) for induced crack in the seam surface is achieved by getting the reciprocal of the normalized Stress Intensity Factor.The research shows that with the increase of the angle between the surfaces,it would be harder for the interface to be open,which means that the equivalent strength for joint surface is gradually increasing.Therefore,in practical design of RCC Arch Dam,it is better to use vertical seams,and the maximum angle of seam surface should not exceed 10° if radial twist stitch is used.关键词
碾压混凝土拱坝/诱导缝/等效强度/空间形态/虚拟裂纹闭合法Key words
RCC arch dam/induced joints/equivalent strength/space form/virtual crack closure technique分类
建筑与水利引用本文复制引用
李海枫,杨波,张国新,徐秀鸣..不同缝面形态下诱导缝开裂效果对比研究[J].水利学报,2017,48(10):1167-1174,1184,9.基金项目
国家自然科学基金项目(51779276,51579252) （51779276,51579252）
国家重点研发计划项目(2016YFB0201003,2016YFC0401807) （2016YFB0201003,2016YFC0401807）
国家重点基础研究发展规划项目(2013CB036406,2013CB035904) （2013CB036406,2013CB035904）
