基于尖端坡降变化的双层堤基渗透破坏通道上溯研究

贾恺; 汤连生; 曹洪; 杨光华

doi:10.11779/CJGE2019S1021

基于尖端坡降变化的双层堤基渗透破坏通道上溯研究 English Version

贾恺^{1, 3, 4},
汤连生^1, ,,
曹洪²,
杨光华^{2, 3, 4}

1. 中山大学地球科学与工程学院,广东广州 510275;
2. 华南理工大学土木与交通学院,广东广州 510640
3. 广东省水利水电科学研究院,广东广州 510625
4. 广东省岩土工程技术研究中心,广东广州 510610

基金项目: 国家自然科学基金项目（41572277,41877229）; 广东省自然科学基金项目（2018B030311066）

详细信息

作者简介:
贾恺(1985—),男,高级工程师,博士,主要从事地下水渗流、基坑工程和边坡工程方面的工程和科研。E-mail:kai.jia@foxmail.com。

通讯作者:
汤连生，E-mail：eestls@mail.sysu.edu.cn

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出版历程
- 收稿日期: 2019-04-29
- 发布日期: 2019-07-14

Upstream movement of piping channel of double-layer dike foundation based on tip hydraulic gradient

JIA Kai^{1, 3, 4},
TANG Lian-sheng^1, ,,
CAO Hong²,
YANG Guang-hua^{2, 3, 4}

1. School of Earth Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;
2. South China University of Technology, Guangzhou 510641, China;
3. Guangdong Institute of Water Resources and Hydropower Research, Guanzhou 510625, China;
4. Technical Research Center of Geotechnical Engineering in Guangdong Province, Guanzhou 510610, China

摘要

摘要: 双层堤基渗透破坏集中渗流通道产生后,有继续上溯和保持稳定两种可能,传统方法中外江与管涌口之间的整体水力坡降只能判定渗透破坏发生与否,无法判定已有通道是否会继续上溯。是否继续上溯关键在通道尖端坡降的发展趋势,其根源是尖端土体颗粒在尖端坡降作用下的稳定性。当通道上溯后,其内沿程各处断面会发生冲淤变化,进而影响尖端坡降,在此作用下对尖端处土体颗粒进行稳定性计算,分析在进一步上溯后,尖端坡降的变化趋势。若尖端坡降随着通道的上溯持续增长,则说明该上溯会进一步发展,若通道上溯后尖端坡降维持稳定,则说明该通道不会持续上溯。编制有限元程序,同时考虑通道断面扩展和上溯与尖端坡降之间的相互影响,判定通道发展趋势。有限元程序中,对集中渗流通道断面进行等效代替,以加快计算速度。在室内进行模型试验,观测预设渗流通道的发展,通过数值模拟与室内试验数据对比,证明本理论方法及所编制程序可行可用。
- 管涌通道 /
- 通道扩展 /
- 通道上溯 /
- 尖端水力坡降
Abstract: After piping channel appears, the length of the channel may elongate or remains stable. The traditional method is to calculate the hydraulic gradient between river and piping port, and it is not precise enough. In fact, the hydraulic gradient at the tip of the channel determines the results. Considering the effects of the channel expansion, the stability of particles at the tip of the channel is analyzed, and change of the hydraulic gradient at the channel tip after channel elongation is also investigated. If the hydraulic gradient continues to grow with the channel elongation, the channel will be extended. If the hydraulic gradient keeps steady, the channel will be stable. The finite element program is compiled, to simulate the cross-section expansion and up-tracking of the channel. The program speed is accelerated by the equivalent substitution of the channel section for concentrated seepage. The model tests are carried out to observe the development of the piping channel. By comparing with the laboratory test data, it is proved that the theoretical method and the finite element program are feasible and usable.
- piping channel /
- channel expansion /
- axial expansion /
- tip hydraulic gradient

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参考文献(10)

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基于尖端坡降变化的双层堤基渗透破坏通道上溯研究 English Version

作者简介: 贾恺(1985—),男,高级工程师,博士,主要从事地下水渗流、基坑工程和边坡工程方面的工程和科研。E-mail:kai.jia@foxmail.com。

通讯作者: 汤连生，E-mail：eestls@mail.sysu.edu.cn

计量

出版历程

Upstream movement of piping channel of double-layer dike foundation based on tip hydraulic gradient

计量

出版历程

目录

作者简介:
贾恺(1985—),男,高级工程师,博士,主要从事地下水渗流、基坑工程和边坡工程方面的工程和科研。E-mail:kai.jia@foxmail.com。

通讯作者:
汤连生，E-mail：eestls@mail.sysu.edu.cn