One-dimensional secondary consolidation coefficient and lateral pressure coefficient of overconsolidated soft clay

LI Guo-wei; HU Jian; LU Xiao-cen; ZHOU Yang

Volume 34 Issue 12

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Chinese Journal of Geotechnical Engineering > 2012 > 34(12): 2198-2205.

LI Guo-wei, HU Jian, LU Xiao-cen, ZHOU Yang. One-dimensional secondary consolidation coefficient and lateral pressure coefficient of overconsolidated soft clay[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(12): 2198-2205.

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One-dimensional secondary consolidation coefficient and lateral pressure coefficient of overconsolidated soft clay

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;
2. Wenzhou Communications Investment Group Co., Ltd., Wenzhou 325000, China;
3. Geotechnical Research Institute, Hohai University, Nanjing 210098, China

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Received Date: December 15, 2011
Published Date: December 24, 2012

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Abstract

Abstract

A series of one-dimensional K₀ consolidation and creep tests on undisturbed samples are carried out to simulate the surcharge preloading process of unloading and reloading and to study the relationship between the secondary consolidation coefficient C_α, lateral press coefficient K_0r of overconsolidated soft clay and stress history. The studies show that the primary consolidation time of the overconsolidated soft clay is much more reduced than that of the normally consolidated soft clay; the secondary consolidation coefficient is related to pressure and it becomes less as increases; and longer pre-loading time makes increase and C_α decrease. The lateral pressure coefficient K_0r in creep process of soft clay is an approximate constant over time and it is influenced by stress state and stress history. It becomes less as reloading pressure increases and becomes larger with pre-consolidation pressure and has an approximate linear relationship with . The K_0r model found by experiment and hypothesis without special parameters reflects the influence of the related conditions and has high consistency with the experimental results. The secondary consolidation coefficient C_α is related with the ratio of shear stress and spheric stress essentially, and they meet the hyperbolic rule.

Keywords:
overconsolidation,
soft clay,
creep,
lateral pressure coefficient

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References (25)

References

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赵俊明,刘松玉,石名磊,等. 交通荷载作用下低路堤动力特性试验研究[J]. 东南大学学报, 2007,37(9):921-925
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LI Guo-wei, SHENG Wei-gao, JIANG Hua-zhong,et al. Secondary compression characteristics and settlement calculation of soft clay under overloading-unloading and reloading[J]. Chinese Journal of Geotechnical Engineering, 2009,31(1):118-12. (in Chinese))

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李国维,杨涛,殷宗泽. 公路软基超载预压机理研究[J]. 岩土工程学报, 2006,28(7):896-901
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BJERRUM L. Engineering geology of Norwegian normally consolidated marine clays as related to settlements of buildings[J]. Géotechnique, 1967,17(2):81-118

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JAKY J. The coefficient of earth pressure at rest[J]. Journal of the Society of Hungarian Architects and Engineers, 1944,7:355-358

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SCHMIDT B. Discussion of earth pressure at rest related to stress history[J]. Canadian Geotechnical Journal, 1966,3:239-242

[15]
罗耀武,凌道盛,陈云敏,等. 土体K0加卸载过程中水平应力变化研究[J]. 工业建筑, 2010,40(7):56-59
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DUNCAN J M, SEED R B. Compaction-induced earth pressures under K0-conditions[J]. Journal of Geotechnical Engineering, 1986,112(1):1-22

[17]
CHEN T J, FANG Y S. Earth pressure due to vibratory compaction[J]. Journal of Geotechnical and Geoenviron- mental Engineering, 2008,134(4):437-444

[18]
WROTH C P. In-situ measurement of initial stress and deformation characteristics[J]. In-situ Measurement of Soil Properties, ASCE,North Crolina State University, Rateigh, N.C. , 1975, 2:181-230

[19]
屈智炯. 土的塑性力学[M]. 成都: 成都科技大学出版社, 1987:43-54
QU Zhi-jiong. Plastic mechanics of soil[M]. Chengdu Science and Technology University Press, 1987:43-54. (in Chinese))

[20]
MESRI G, CASTRO A. The Cα/Cc concept and K0 during secondary compression[J]. Geotechnical Engineering, ASCE,1987, 113(3):230-247

[21]
MESRI G, FENG T W. Surcharge reduce secondary settlement[C]// Proc of the Int Conf on Geotechnical Engineering for Coastal Development. Yokohama, 1991(1):359-364

[22]
MESRI G, STARK T D, AJLOUNI M A and CHEN C. S. Secondary compression of peat with or without surcharging [J]. Geotechnical Engineering, ASCE,1997, 123(5):411-421

[23]
MESRI G, GODLEWSKI, P M. Time- and stress- compressibility interrelationship[J]. Geotechnical Engineering, ASCE,1977, 103(5):417-430

[24]
MESRI G, AJLOUNI M A. Viscous behaviour of soil under oedometric conditions: Discussion[J]. Canadian Geotechnical Journal, 1997,34(1):159-161

[25]
MESRI G, VARDHANABHUTI B. Secondary Compression[J]. Journal of Geotechnical and Geoenviromental Engineering, 2005,131(3):398-401

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[1]	赵俊明,刘松玉,石名磊,等. 交通荷载作用下低路堤动力特性试验研究[J]. 东南大学学报, 2007,37(9):921-925 ZHAO Jun-ming, LIU Song-yu, SHI Ming-lei,et al. Experimental study on dynamic response of low embankment under traffic load[J]. Journal of Southeast University, 2007,37(9):921-925. (in Chinese))
[2]	KUTTER B L, SATHIALINGAM N. Elastic-viscoelastic modeling of the rate-dependent behaviour of clays[J]. Géotechnique, 1992,42(3):427-441
[3]	YIN Jian-hua, ZHU Jun-gao, GRAHAM James. A new elastic viscoplastic model for time-dependent behaviour of normally and overconsolidated clays: theory and verification[J]. Canadian Geotechnical Journal, 2002,39(1):157-173
[4]	李军世,孙钧. 上海淤泥质黏土的Mesri蠕变模型[J]. 土木工程学报, 2001,34(6):75-79 LI Jun-shi, SUN Jun. Mesris creep model for Shanghai silt clay[J]. China Civil Engineering Journal, 2001,34(6):75-79. (in Chinese))
[5]	朱鸿鹄,陈晓平,程小俊,等. 考虑排水条件的软土蠕变特性及模型研究[J]. 岩土力学, 2006,27(5):694-698 ZHU Hong-hu, CHEN Xiao-ping, CHENG Xiao-jun,et al. Study on creep characteristics and model of soft soil considering drainage condition[J]. Rock and Soil Mechanics, 2006,27(5):694-698. (in Chinese))
[6]	殷宗泽,张海波,朱俊高,等. 软土的次固结[J]. 岩土工程学报, 2003,25(5):521-526 YIN Zong-ze, ZHANG Hai-bo, ZHU Jun-gao,et al. Secondary consolidation of soft soils[J]. Chinese Journal of Geotechnical Engineering, 2003,25(5):521-526. (in Chinese))
[7]	JTG E402007公路土工试验规程[S]. 2007: 156-162. JTG E402007 Highway soil test procedures[S]. 2007: 156-162. (in Chinese))
[8]	李国维. 公路软基超载预压控制沉降理论研究[D]. 南京:河海大学, 2007. LI Guo-wei. Settlement control theory in the surcharge preloading method on the soft ground of highways[D]. Nanjing: Hohai University, 2007.(in Chinese))
[9]	李国维,盛维高,蒋华忠,等. 超载卸荷后再压缩软土的次压缩特征及变形计算[J]. 岩土工程学报, 2009,31(1):118-12 LI Guo-wei, SHENG Wei-gao, JIANG Hua-zhong,et al. Secondary compression characteristics and settlement calculation of soft clay under overloading-unloading and reloading[J]. Chinese Journal of Geotechnical Engineering, 2009,31(1):118-12. (in Chinese))
[10]	李国维,杨涛,殷宗泽. 公路软基超载预压机理研究[J]. 岩土工程学报, 2006,28(7):896-901 LI Guo-wei, YANG Tao, YIN Zong-ze. Study of Mechanism about surcharge preloading method on the highway soft ground[J]. Chinese Journal of Geotechnical Engineering, 2006,28(7):896-901. (in Chinese))
[11]	BJERRUM L. Engineering geology of Norwegian normally consolidated marine clays as related to settlements of buildings[J]. Géotechnique, 1967,17(2):81-118
[12]	李作勤. 影响黏土静止侧压力的一些问题[J]. 岩土力学, 1995,16:9-16 LI Zuo-qin. Some problems affecting lateral earth pressure at rest in clays[J]. Rock and Soil Mechanics, 1995,16:9-16. (in Chinese))
[13]	JAKY J. The coefficient of earth pressure at rest[J]. Journal of the Society of Hungarian Architects and Engineers, 1944,7:355-358
[14]	SCHMIDT B. Discussion of earth pressure at rest related to stress history[J]. Canadian Geotechnical Journal, 1966,3:239-242
[15]	罗耀武,凌道盛,陈云敏,等. 土体K0加卸载过程中水平应力变化研究[J]. 工业建筑, 2010,40(7):56-59 LUO Yao-wu, LING Dao-sheng, CHEN Yun-min,et al. The change in horizontal stress of soils during K0 Loading-unloading[J]. Industrial Construction, 2010,40(7):56-59. (in Chinese))
[16]	DUNCAN J M, SEED R B. Compaction-induced earth pressures under K0-conditions[J]. Journal of Geotechnical Engineering, 1986,112(1):1-22
[17]	CHEN T J, FANG Y S. Earth pressure due to vibratory compaction[J]. Journal of Geotechnical and Geoenviron- mental Engineering, 2008,134(4):437-444
[18]	WROTH C P. In-situ measurement of initial stress and deformation characteristics[J]. In-situ Measurement of Soil Properties, ASCE,North Crolina State University, Rateigh, N.C. , 1975, 2:181-230
[19]	屈智炯. 土的塑性力学[M]. 成都: 成都科技大学出版社, 1987:43-54 QU Zhi-jiong. Plastic mechanics of soil[M]. Chengdu Science and Technology University Press, 1987:43-54. (in Chinese))
[20]	MESRI G, CASTRO A. The Cα/Cc concept and K0 during secondary compression[J]. Geotechnical Engineering, ASCE,1987, 113(3):230-247
[21]	MESRI G, FENG T W. Surcharge reduce secondary settlement[C]// Proc of the Int Conf on Geotechnical Engineering for Coastal Development. Yokohama, 1991(1):359-364
[22]	MESRI G, STARK T D, AJLOUNI M A and CHEN C. S. Secondary compression of peat with or without surcharging [J]. Geotechnical Engineering, ASCE,1997, 123(5):411-421
[23]	MESRI G, GODLEWSKI, P M. Time- and stress- compressibility interrelationship[J]. Geotechnical Engineering, ASCE,1977, 103(5):417-430
[24]	MESRI G, AJLOUNI M A. Viscous behaviour of soil under oedometric conditions: Discussion[J]. Canadian Geotechnical Journal, 1997,34(1):159-161
[25]	MESRI G, VARDHANABHUTI B. Secondary Compression[J]. Journal of Geotechnical and Geoenviromental Engineering, 2005,131(3):398-401

One-dimensional secondary consolidation coefficient and lateral pressure coefficient of overconsolidated soft clay

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