引用本文:李国英,韩朝军,魏匡民,米占宽.考虑坝体地基接触效应的特高心墙堆石坝[J].水利水运工程学报,2019,(6):107-115
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考虑坝体地基接触效应的特高心墙堆石坝
李国英1, 韩朝军2, 魏匡民1, 米占宽1
1.南京水利科学研究院水利部土石坝破坏机理与防控技术重点实验室,江苏南京;2.中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳
摘要:
传统的土石坝结构计算分析中通常忽略坝体与基岩之间的摩擦滑动变形,这与实际情况不符,坝体地基接触摩擦效应对于修建在狭窄陡峻河谷区的特高坝表现尤为明显。采用三维有限元方法对修建在狭窄河谷区特高心墙堆石坝结构安全性进行了研究,研究中考虑了坝体地基摩擦接触效应,模拟了水库蓄水、坝料湿化、流变等多因素共同作用下坝体结构力学行为以及坝体地基接触位移演化过程。基于倾度法对坝体运行过程中可能的裂缝扩展区域进行了预测。研究得出:对于狭窄河谷上特高土石坝,坝体与地基的相对滑移较大,计算中应予以考虑。研究结论可为峡谷区特高心墙堆石坝设计提供技术依据。
关键词:  高土石坝  接触效应  应力变形
DOI:
分类号:TU45
基金项目:国家重点研发计划资助项目(2018YFC1508503); 国家自然科学基金资助项目(U1765203);中央级公益性科研院所基本科研业务费项目(Y319009)
Study on safety of a high earth-core rockfill dam considering contact effect between dam and foundation
LI Guoying1, HAN Chaojun2, WEI Kuangmin1, MI Zhankuan1
1.Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam of the Ministry of Water Resources, Nanjing Hydraulic Research Institute, Nanjing;2.PowerChina Guiyang Engineering Corporation Limited, Guizhou
Abstract:
With a traditional method to calculate the stress and deformation of earth-rock dam, the contact effect between the dam and the bedrock is neglected, which is not consistent with the actual condition. The contact friction has a significant effect on the high dams located in the narrow and steep valleys. In this research, a high earth-core rockfill dam to be built in a narrow valley area is studied, the friction contact effect between the dam and the bedrock, water storage, wetting and rheology effect are all considered to simulate the dam body behaviors. Based on the deformation gradient method, the area where cracks may occur during the operation of the dam is predicted. Calculation results are used to evaluate the safety of the earth-core rockfill dam. It is found that the relative slip displacement between dam body and foundation is large for high earth-rock dams in narrow river valleies and should be considered. The conclusion of the study can provide technical basis for the design and construction of high earth-core rockfill dams located in canyon areas.
Key words:  high earth core rockfill dam  contact friction effect  stress and deformation
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