长江口海陆交互相沉积土复合地基孔压响应特性

刘志彬; 刘松玉; 经绯; 居俊; 李维; 姬付全

doi:10.11779/CJGE2015S2019

长江口海陆交互相沉积土复合地基孔压响应特性 English Version

刘志彬^{1, 2},
刘松玉^{1, 2},
经绯^{1, 2},
居俊¹,
李维¹,
姬付全¹

1. 东南大学岩土工程研究所,江苏南京 210096; 2. 江苏省城市地下工程与环境安全重点实验室,江苏南京 210096

基金项目: 国家自然科学基金项目（41272311）; 江苏省交通科学研究; 计划项目（09Y33）

详细信息

作者简介:
刘志彬(1976-),男,副教授,主要从事环境岩土与地质工程等方面教学和科研。

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出版历程
- 收稿日期: 2015-03-25
- 发布日期: 2015-07-24

Pore pressure response of composite foundation in interactive marine and terrestrial deposit of Yangtze River Estuary

LIU Zhi-bin^{1, 2},
LIU Song-yu^{1, 2},
JING Fei^{1, 2},
JU Jun¹,
LI Wei¹,
JI Fu-quan¹

1. Institute of Geotechnical Engineering,Southeast University, Nanjing 210096, China; 2. Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Nanjing 210096, China

摘要

摘要: 针对长江口北岸典型海陆交互相沉积土PHC管桩复合地基的孔压响应特性,在崇启大桥北接线工程选择现场试验段,对路堤填筑过程桩间土不同深度的孔压变化规律开展了现场试验研究,并对该地区的气象和水文地质条件进行了同步调查。结果表明,长江口海陆交互相沉积土地区地下水位受当地降雨和季节性波动影响剧烈,同一年内变化幅度可达1.6 m,在分析地基土超孔压时必须加以考虑。浅层土体渗透性较好,超孔压反应灵敏,受填筑过程影响呈锯齿状波动。深层软土渗透性差,超孔压随路堤填筑有累积上升的趋势。管桩复合地基加固区超孔压较小且消散快,下卧层超孔压较高且消散缓慢。因此,长江口海陆交互相沉积土地区复合地基下卧层软土固结特性需重点关注。
- 长江口 /
- 海陆交互相沉积土 /
- 复合地基 /
- 孔隙水压力 /
- 现场试验
Abstract: To learn the pore pressure response characteristics of PHC pipe pile composite foundation in interactive marine and terrestrial deposit of Yangtze River Estuary, a test site is selected at the northern connection project of Chongming—Qidong Bridge, and then field tests are conducted to study the variation of pore pressure at different depths during embankment loading. At the same time, the meteorology and hydrogeololgy of the local area are investigated. The test results indicate that the water table is greatly influenced by local precipitation and seasonal fluctuations of groundwater. The variation of the water table in one year may reach 1.6 m, which must be considered in the pore pressure analysis of foundation soils. The excessive pore pressure of shallow soils fluctuates sharply and dissipates quickly due to their good permeability. While the excessive pore pressure of deep soils may be accumulated and gradually increase owing to their low permeability and embankment loading. The excessive pore pressure in the reinforced zone of the pipe pile composite foundation is low and dissipates quickly, but that in the underlying soft layer is relatively high and dissipates slowly. Therefore, the consolidation property of the underlying soft layer in the interactive marine and terrestrial deposit of Yangtze River Estuary should be paid attention to.
- Yangtze River Estuary /
- interactive marine and terrestrial deposit /
- composite foundation /
- pore pressure /
- field test

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参考文献(8)

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