承压水越流对地下结构浮力影响试验研究

木林隆; 王乐; 黄茂松; 何彦承; 康景文

doi:10.11779/CJGE201904022

承压水越流对地下结构浮力影响试验研究 English Version

木林隆^1,2,
王乐^1,2,
黄茂松^1,2,
何彦承^1,2,
康景文³

1. 同济大学岩土与地下工程教育部重点实验室,上海 200092;
2. 同济大学地下建筑与工程系,上海 200092;
3. 中国建筑西南勘察设计研究院有限公司,四川成都 610000

详细信息

作者简介:
木林隆(1984- ),男,副教授,主要从事深基础与地下工程开挖方面的研究工作。E-mail：mulinlong@hotmail.com。

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- 收稿日期: 2018-04-07
- 发布日期: 2019-04-24

Experimental study on influences of leakage of confined water on buoyancy of underground structures

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;
3. China Southwest Geotechnical Investigation & Design Institute Co., Ltd., Chengdu 610000, China;

摘要

摘要: 针对承压水地层中地下结构受到浮力预测不准确的问题,开展存在地下结构的土层中竖向渗流模型试验,考察不同环境中的承压水渗流对地下结构的浮力影响。主要探讨不同水力梯度下均质土层中竖向渗流及承压水向上穿越弱透水层渗流时,所产生的孔隙水压力变化规律及其对地下结构的浮力的影响特点。试验表明：存在渗流时,土中孔压分布和地下结构浮力与静水压力不符;均质土中竖向渗流时,孔压和浮力较同深度理论值的提升比例与竖向水力梯度成正比;承压水在上覆弱透水层中渗流时,弱透水层中孔压和浮力的提升比例要大于强透水层,且土分层界面处孔压和浮力的提升比例最大,约为2倍的水力梯度。
- 地下结构 /
- 承压水 /
- 渗流 /
- 浮力 /
- 孔隙压力
Abstract: In order to solve the problem that the prediction of the buoyancy of underground structures in confined aquifer is inaccurate, a series of model tests on the impact of confined aquifer seepage on the buoyancy of underground structures are conducted. Two cases are studied: (1) the vertical seepage in homogeneous soil layer; (2) the vertical seepage of the confined water through overlying aquiclude. The influences of the seepage on the buoyancy of the underground structure under different hydraulic gradients in both cases are investigated. The results show that the pore pressure distribution and the buoyancy of the underground structures are not consistent with those obtained from hydrostatic pressure when the seepage occurs. And they are usually larger than those obtained from hydrostatic pressure. The raising ratio of the pore pressure and buoyancy to the theoretical value based on hydrostatic pressure equals to the vertical hydraulic gradient in case the vertical seepage occurs in homogeneous soil. The raising ratio of the pore pressure and buoyancy to the theoretical value based on hydrostatic pressure is much larger than the hydraulic gradient in case the confined water seeps in the overlying aquiclude, which is obviously different from that in homogenous soil. In the case herein, the raising ratio is about 2 times the hydraulic gradient.
- underground structure /
- confined water /
- seepage /
- buoyancy /
- pore pressure

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参考文献(20)

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承压水越流对地下结构浮力影响试验研究 English Version

作者简介: 木林隆(1984- ),男,副教授,主要从事深基础与地下工程开挖方面的研究工作。E-mail：mulinlong@hotmail.com。

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Experimental study on influences of leakage of confined water on buoyancy of underground structures

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出版历程

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作者简介:
木林隆(1984- ),男,副教授,主要从事深基础与地下工程开挖方面的研究工作。E-mail：mulinlong@hotmail.com。