长江口软土的压缩特性及围堤沉降预测分析

doi:10.12066/j.issn.1007-2861.2112

Abstract

Abstract:

Owing to the difficulty in predicting the settlement of soft clay in the Yangtze River Estuary area, a series of consolidation tests of undisturbed and remoulded soft clays was conducted to study the consolidation and secondary consolidation characteristics of soft clays in this region. The range of compression indexs and the relationship between the coefficient of secondary consolidation in soft clay and the load were investigated. Furthermore, the engineering characteristics of the Yangtze River Estuary soft clay, typical Shanghai soft clay, and Chongming Island soft clay were compared. Two methods were applied to calculate and predict post-construction settlement, and the feasibility of these two methods was analyzed. The compressibility index of muddy silty clay in the Yangtze River Estuary was found to range from 0.316 to 0.364, and that of silty clay ranged from 0.267 to 0.313, which are both somewhat higher than that of typical Shanghai soft clay. With an increase in the load, the secondary consolidation coefficient of undisturbed clay increase at first but decreased afterwards, while the secondary consolidation coefficient of the remoulded clay was independent of the load. The secondary consolidation coefficient of soft clay in the Yangtze River Estuary was found to be greater than that of the typical soft clay in Shanghai. In conclusion, the physical properties of Yangtze River Estuary soft clay, typical Shanghai soft clay, and Chongming Island soft clay are different.

Key words: muddy silty clay, silty clay, secondary consolidation coefficient, settlement

CLC Number:

TU47

Liang YANG, Zhongyi ZHAO, Aifang QIN. Compression characteristics and analysis of levee settlement of soft clay in the Yangtze River Estuary[J]. Journal of Shanghai University（Natural Science Edition）, 2019, 25(4): 526-535.

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References 16

[1]	孙更生, 郑大同 . 软土地基与地下工程 [M]. 2 版. 北京: 中国建筑工业出版社, 1984: 18-47.
[2]	周海, 阮伟 . 开发横沙东滩, 建设上海发展新基地的构想[J]. 水运工程, 2012(12):9-13.
[3]	上海岩土工程勘察设计研究院有限公司. 上海市工程建设规范岩土工程勘察规范: DGJ08—37—2012[S]. 上海: 上海岩土工程勘察设计研究院有限公司, 2012.
[4]	Mesri G, Godlewski P M . Time- and stress-compressibility interrelationship[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1977,103:106-113.
[5]	武朝军, 叶冠林, 王建华 . 上海浅部土层压缩指数与天然含水率的关系[J]. 岩土力学, 2014,35(11):3184-3190.
[6]	Buisman A S K. Results of long duration settlement tests [C]//Proceedings of the First International Conference on Soil Mechanics and Foundation Engineering. 1936: 103-106.
[7]	余湘娟, 殷宗泽, 董卫军 . 荷载对软土次固结影响的试验研究[J]. 岩土工程学报, 2007,29(6):913-916.
[8]	雷华阳, 王学超, 丁小冬 , 等. 软土主次固结划分及影响因素探讨[J]. 工程地质学报, 2014,22(3):489-497. doi: 10.13544/j.cnki.jeg.2014.03.019
[9]	孙德安, 申海娥 . 上海软土的流变特性试验研究[J]. 水文地质工程地质, 2010,37(3):74-78.
[10]	周学明, 袁良英, 蔡坚强 , 等. 上海地区软土分布特征及软土地基变形实例浅析[J]. 上海国土资源, 2005,26(4):6-9.
[11]	殷建华 . 从本构模型研究到试验和光纤监测技术研发[J]. 岩土工程学报, 2011,33(1):1-15.
[12]	Yin J H . Constitutive modelling of time-dependent stress-strain behaviour of soils[D]. Winnipeg: University of Manitoba, 1990: 314.
[13]	Yin J H, Graham J . Viscous elastic plastic modelling of one-dimensional time dependent behaviour of clays[J]. Can Geotech J, 1989,26:199-209.
[14]	Yin J H, Graham J . Equivalent times and elastic-visco-plastic modelling of time-dependent stress-strain behaviour of clays[J]. Canadian Geotechnical Journal, 1994,31:42-52.
[15]	姚仰平, 孔令明, 胡晶 . 考虑时间效应的 UH 模型[J]. 中国科学: 技术科学, 2013(3):298-314.
[16]	姚仰平, 祁生钧, 车力文 . 高填方地基工后沉降计算[J]. 水力发电学报, 2016,35(3):1-10.

Compression characteristics and analysis of levee settlement of soft clay in the Yangtze River Estuary

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