| 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 |
| 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 |
| 投稿时间：2017-06-12 |
| DOI：10.13243/j.cnki.slxb.20170612 |
| 中文关键词: 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 |
| 英文关键词: RCC arch dam induced joints equivalent strength space form virtual crack closure technique |
| 基金项目:国家自然科学基金项目（51779276，51579252）；国家重点研发计划项目（2016YFB0201003，2016YFC0401807）；国家重点基础研究发展规划项目（2013CB036406，2013CB035904） |
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| 中文摘要: |
| 一些采用径向扭缝的碾压混凝土拱坝工程中，出现了诱导缝周边坝体混凝土开裂而诱导缝本身未张开的现象，因此需定量分析不同空间形态缝面对诱导缝开裂的影响效果。根据碾压混凝土拱坝应力变化特点以及诱导缝开裂变化规律，本文拟定含不同缝面空间形态的有限大平板和圆筒拱坝算例，利用虚拟裂纹闭合法和Richard脆性断裂准则获取空间缝面等效应力强度因子，研究缝面应力强度因子随缝面夹角的变化规律；通过对归一化后的应力强度因子求倒数，获取不同缝面夹角条件下诱导缝等效强度的修正系数即缝面空间形态影响因子，以反映不同缝面空间形态下诱导缝开裂效果。研究表明，随着缝面夹角的不断增大，缝面越不容易张开，这就意味着缝面的等效强度在逐渐增大。因此，在实际碾压混凝土拱坝设计中，诱导缝应尽量采用竖向垂直缝布置；若要布置成径向扭缝，则缝面夹角最大不宜超过10°。 |
| 英文摘要: |
| Induced joints are commonly used to control cracks in the design of RCC arch dam. At pres-ent, 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 frac-ture 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 Fac-tor 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 equiva-lent 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 in-crease 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. |
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