等向固结饱和黏土卸载特性影响因素研究

闫澍旺; 张京京; 陶琳; 孙立强

doi:10.11779/CJGE2016S2007

等向固结饱和黏土卸载特性影响因素研究 English Version

天津大学水利工程仿真与安全国家重点实验室,天津 300072

基金项目: 国家自然科学基金项目（41272323）; 天津市科技支撑计划重点项目（11JCZDJC23900）

详细信息

作者简介:
闫澍旺(1949- ),男,教授,博士生导师,主要从事软土地基处理以及海洋岩土工程等方面的教学和科研工作。E-mail: yanshuwang@tju.edu.cn。

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出版历程
- 收稿日期: 2016-05-18
- 发布日期: 2016-10-19

Influencing factors for unloading characteristics in saturated clay

State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China

摘要

摘要: 饱和黏土地基中的沉箱、自升式钻井船的桩靴等结构物或结构基础上拔时,常常遇到难以拔出的现象,同时现场试验表明上拔速率对上拔阻力有很大的影响。通过等向固结的减压三轴伸长试验,研究了固结压力和变形速率对卸荷状态下天津饱和软黏土的应力路径、应力-应变特性以及孔压发展规律的影响。试验表明,固结压力越大,负孔压峰值越大,抗剪强度越大;变形速率越大,负孔压峰值越大,抗剪强度越大。天津软黏土卸荷时呈现应变软化的特性,并且剪切破坏时应变为5%~10%。同时,给出孔压系数试验结果。
- 饱和软黏土 /
- 固结压力 /
- 上拔速率 /
- 负孔压 /
- 三轴伸长试验
Abstract: When a gravity structure, such as a caisson or a jackup spudcan, is pulled out from the saturated soft clay foundation, a negative excess pore pressure will be developed, which greatly increases the uplift force. Meanwhile, field tests show that the extraction rate has a great influence on uplift resistance. The stress path, the stress-strain characteristics and the development of pore pressure of Tianjin saturated soft clay under unloading condition are studied based on the triaxial extension tests. The research indicates that the higher consolidation pressure and the larger strain rate produce larger negative pore pressure and larger shear strength. Tianjin soft clay is characterized by the strain softening and the shear failure strain of 5% to 10%. Finally, the results of pore pressure coefficient tests are obtained.
- saturated soft clay /
- uplift force /
- consolidation pressure /
- extraction rate /
- negative excess pore pressure

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参考文献(16)

[1]	冯国栋, 刘祖德, 俞季民, 等. 海泥对海洋工程衬垫底面吸附力的试验研究[J]. 武汉水利电力学院学报, 1981, 1: 1-10. (FENG Guo-dong, LIU Zu-de, YU Ji-min, et al. Experimental study on adsorption force underocean engineering pad by sea mud[J]. Journal of Wuhan Institute of Hydraulic and Electric Engineering, 1981, 1: 1-10.(in Chinese))
[2]	PURAWANA O A, LEUNG C F, CHOW Y K, et al. Influence of base suction on extraction of jack-up spudcans[J]. Géotechnique, 2006, 55(10): 741-753.
[3]	韩丽华, 姜萌, 张日向. 海洋结构物沉箱吸附力的试验模拟[J]. 港工技术, 2009, 6(46): 43-45. (HAN Li-hua, JANG Meng, ZHANG Ri-xiang. Experiment Simulation of Absorption Force of Marine Structure Caisson[J]. Port Engineering Technology, 2009, 6(46): 43-45. (in Chinese))
[4]	SKEMPTON A W. The pore-pressure coefficients A and B[J]. Géotechnique, 1954, 4(4): 143-147.
[5]	HENKEL D J, WADE G. H. Plane strain tests on a saturated remouldedclay[J]. Journal of Soil Mechanics & Foundations Div, 1966, 92.
[6]	王铁儒, 陈龙珠, 李明逵. 正常固结饱和黏性土孔隙水压力性状的研究[J]. 岩土工程学报, 1987, 9(4): 23-32. (WANG Tie-ru, CHEN Long-Zhu, LI Ming-kui. Pore pressure characteristic research of normally consolidated saturated clay[J]. Chinese Journal of Geotechnical Engineering, 1987, 9(4): 23-32. (in Chinese))
[7]	王建国, 濮家骝, 李广信. 不同本构模型预测饱和土孔压生成的研究[J]. 岩土工程学报, 1989, 11(5): 51-63. (WANG Jian-guo, PU Jia-liu, LI Guang-xin. Pore pressure characteristic research of saturated soil based on different constitutive models[J]. Chinese Journal of Geotechnical Engineering, 1989, 11(5): 51-63. (in Chinese))
[8]	周健, 王浩, 蔡宏英, 等. 软土卸载孔压特性的试验与理论计算分析[J]. 岩土工程学报, 2002, 24(5): 556-559. (ZHOU Jian, WANG Hao, CAI Hong-ying, et al. Pore pressure characteristic analysis of soft clay during unloading based on lab data and numerical calculation[J]. Chinese Journal of Geotechnical Engineering, 2002, 24(5): 556-559. (in Chinese))
[9]	LI X J, TIAN Y H, GAUDIN C, et al. Comparative study of the compression and uplift of shallow foundations[J]. Computers and Geotechnics, 2015 ,69:38-45.
[10]	但汉波, 王立忠. K 0 固结软黏土的应变率效应研究[J]. 岩土工程学报, 2008(5): 718-725. (DAN Han-bo, WANG Li-zhong. Strain-rate dependent behaviors of K 0 consolidated clays[J]. Chinese Journal of Geotechnical Engineering, 2008(5): 718-725. (in Chinese))
[11]	蔡羽, 孔令伟, 郭爱国, 等. 剪应变率对湛江强结构性黏土力学性状的影响[J]. 岩土力学, 2006(8): 1235-1240. (CAI Yu, KONG Ling-wei, GUO Ai-guo, et al. Effects of shear strain rate on mechanical behavior of Zhanjiang strong structured clay[J]. Rock and Soil Mechanics, 2006(8): 1235-1240. (in Chinese))
[12]	高彦斌, 汪中为. 应变速率对黏土不排水抗剪强度的影响[J]. 岩石力学与工程学报, 2005(增刊2): 5779-5783. (GAO Yan-bin, WANG Zhong-wei. Effect on strain rate on undrained shear strength of clays[J]. Rock and Soil Mechanics, 2005(S2): 5779-5783. (in Chinese))
[13]	张学言, 闫澍旺. 岩土塑性力学基[M]. 2版. 天津: 天津大学出版社, 2004. (ZHANG Xue-yan, YAN Shu-wang. Fundamentals of geotechnicsplasticity[M]. 2nd ed. Tianjin: Tianjin University Press, 2004. (in Chinese))
[14]	SL237—1999土工试验规程[S]. 1999. (SL237—1999 Specification of soil test[S]. 1999. (in Chinese))
[15]	ROSCOE K H, BURLAND J B. On the generalized stress-strain behaviour of wet clay[M]. Cambridge: Cambridge University Press, 1968: 535-609.
[16]	关云飞, 高峰, 赵维炳, 等. ANSYS软件中修正剑桥模型的二次开发[J]. 岩土力学, 2010, 31(3): 976-981.(GUAN Yun-fei, GAO Feng, ZHAO Wei-bing, et al. Secondary development of modified Cambridge model in ANSYS software[J]. Rock and soil mechanics, 2010, 31(3): 976-981. (in Chinese))

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