考虑流固耦合效应的重力坝水力劈裂模拟

王克峰; 章青; 夏晓舟

doi:10.3879/j.issn.1000-0887.2015.09.008

考虑流固耦合效应的重力坝水力劈裂模拟

doi: 10.3879/j.issn.1000-0887.2015.09.008

河海大学力学与材料学院, 南京 210098

基金项目: 国家自然科学基金(51179064; 11132003; 11372099); 中央高校基本科研业务费(2013B32714)

详细信息

作者简介:
王克峰（1986—），男，山东临沂人，博士生(E-mail: hhuwkf@126.com);章青（1963—），男，安徽铜陵人，教授，博导(通讯作者. E-mail: lxzhangqing@hhu.edu.cn);夏晓舟（1976—），男，江西泰和人，副教授，博士(E-mail: xiaxiaozhou@163.com).

中图分类号: O242.21;O346.1
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出版历程
- 收稿日期: 2014-11-19
- 修回日期: 2015-04-09
- 刊出日期: 2015-09-15

Modeling of Hydraulic Fracturing of Concrete Gravity Dam Considering Fluid-Structure Interaction

Department of Engineering Mechanics, Hohai University, Nanjing 210098, P.R.China

Funds: The National Natural Science Foundation of China(51179064; 11132003; 11372099)

摘要

摘要: 裂缝的高压水力劈裂是混凝土高坝安全评估的重要部分，研究其过程中的流固耦合作用是准确预测在各种情况下裂纹扩展路径和危险程度的关键.该文利用扩展有限元法在模拟裂纹扩展方面的优势，对大坝的裂纹进行水力劈裂模拟研究.裂纹中的水压分布模型采用Brühwiler和Saouma水力劈裂试验的成果，体现了水压和裂纹宽度的耦合关系，给出了扩展有限元在裂纹面上施加水压力荷载的实施方法，对一典型重力坝裂纹的水力劈裂进行了数值模拟分析.研究结果表明：采用扩展有限元法模拟水力劈裂，克服了常规有限元法存在的缺点，裂纹扩展时不用重新划分网格，裂纹的实时宽度可以由加强节点的附加自由度得到，裂纹面上水压的施加也变得简单易行.当考虑裂纹内的流固耦合效应时，裂纹的扩展路径相比不考虑耦合效应时的扩展路径(均布全水头水压)，扩展角变大，扩展距离变短.
- 流固耦合 /
- 重力坝 /
- 水力劈裂 /
- 扩展有限元 /
- 裂纹扩展
Abstract: High-pressure hydraulic fracturing (HF) is an important part of the safety-assessment of high concrete dams. Fluid-structure interaction during the progress is the keypoint to accurately predict crack growth path and risk level. In this paper, the extended finite element method (XFEM) was used for numerical simulation of HF of concrete gravity dam. Water pressure distribution model was obtained from experimental results of the hydraulic fracturing test carried out by Brühwiler and Saouma, which embodied the coupling relationship between water pressure and crack width. The method loading water pressure on crack surfaces was also given in XFEM program and then hydraulic fracturing of gravity dam was simulated. Results show that: XFEM is a very convenient and effective tool to simulate hydraulic fracture propagation. In XFEM, crack can propagate without re-meshing and crack width can be easily gained with the enriched freedom degrees. When fluid-structure interaction is in consideration, the extension angle is bigger and the crack growth length is shorter than that in the condition without considering fluid-structure interaction.
- fluid-structure interaction /
- gravity dam /
- hydraulic fracture /
- XFEM /
- crack propagation

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