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http://dx.doi.org/10.12989/gae.2022.29.6.615

A simple creep constitutive model for soft clays based on volumetric strain characteristics  

Chen, G. (Minist Educ Geomech & Embankment Engn, Key Lab, Hohai Univ)
Zhu, J.G. (Minist Educ Geomech & Embankment Engn, Key Lab, Hohai Univ)
Chen, Z. (Minist Educ Geomech & Embankment Engn, Key Lab, Hohai Univ)
Guo, W.L. (Geotech Engn Dept, Nanjing Hydraul Res Inst)
Publication Information
Geomechanics and Engineering / v.29, no.6, 2022 , pp. 615-626 More about this Journal
Abstract
The soft clays are widely distributed, and one of the prominent engineering problems is the creep behavior. In order to predict the creep deformation of soft clays in an easier and more acceptable way, a simple creep constitutive model has been proposed in this paper. Firstly, the triaxial creep test data indicated that, the strain-time (𝜀-t) curve showing in the 𝜀-lgt space can be divided into two lines with different slopes, and the time referring to the demarcation point is named as tEOP. Thereafter, the strain increments occurred after the time tEOP are totally assumed to be the creep components, and the elastic and plastic strains had occurred before tEOP. A hyperbolic equation expressing the relationship between creep volumetric strain, stress and time is proposed, with several triaxial creep test data of soft clays verifying the applicability. Additionally, the creep flow law is suggested to be similar with the plastic flow law of the modified Cam-Clay model, and the proposed volumetric strain equation is used to deduced the scaling factor for creep strains. Therefore, a creep constitutive model is thereby established, and verified by successfully predicting the creep principal strains of triaxial specimens.
Keywords
clay; constitutive model; creep; flow rule; triaxial test;
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Times Cited By KSCI : 5  (Citation Analysis)
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1 Chen, X.P., Huang, G.Y. and Liang, Z.S. (2003), "Study on soft properties of the pearl river delta", Chinese J. Rock Mech. Eng., 1,137-141. https://doi.org/1000-6915(2003)01-0137-05. (in Chinese).
2 Cai, Z.Y. et al. (2019), Geotechnical Test Method Standard. China Planning Press, Beijing, China.
3 Hu, J.L. (2013), "The study of creep characteristics for soft clay and its application on calculation of long-term subgrade settlement", Ph.D. Dissertation, Hohai University, Nanjing, Jiangsu, China.
4 Lester, A.M., Kouretzis, G.P., Pineda, J.A. and Carter, J.P. (2021), "Finite element implementation of an isotach elastoplastic constitutive model for soft soils", Comput. Geotech., 136, 104248. https://doi.org/10.1016/j.compgeo.2021.10424.   DOI
5 Zhu, H.H., Chen, X.P. and Cheng, X.J. (2006), "Study on creep characteristics and model of soft soil considering drainage condition", Rock Soil Mech., 27(5), 694-698. https://doi.org/10.16285/j.rsm.2006.05.003. (in Chinese)   DOI
6 Yin, J.H. and Graham, J. (1994), "Equivalent times and one-dimensional elastic visco-piastic modelling of time-dependent stress-strain behavior of clays", Can. Geotech. J., 31, 42-52. https://doi.org/10.1016/0148-9062(94)90219-4.   DOI
7 Yin, J.H. and Graham, J. (1996), "Elastic visco-plastic modelling of one-dimensional consolidation", Geotechnique, 46(3), 515-527. https://doi.org/10.1680/geot.1996.46.3.515.   DOI
8 Perzyna, P. (1966), "Fundamental problems in viscoplasticity", Adv. Appl. Mech., 9(2), 243-377. https://doi.org/10.1016/S0065-2156(08)70009-7.   DOI
9 Thu, M.L., Behzad, F., Hadi, K. and Sun, W.J. (2017), "Numerical optimization applying trust-region reflective least squares algorithm with constraints to optimize the non-linear creep parameters of soft soil", Appl. Math. Model., 41, 236-256. https://doi.org/10.1016/j.apm.2016. 08.034.   DOI
10 Xu, X.B. and Cui, Z.D. (2020), "Investigation of a fractional derivative creep model of clay and its numerical implementation", Comput. Geotech., 119, 103387. https://doi.org/10.1016/j.compgeo.2019.103387.   DOI
11 Yin, J.H., Zhu, J.G. and Graham, J. (2002), "A new elastic visco-plastic model for time-dependent behavior of normally and overconsolidated clays-theory and verification", Can. Geotech. J., 39(1), 157-173. https://doi.org/10.1139/ 01-074.   DOI
12 Zhen, Y. Gang, L. Zhang, J. and Zhang, R. (2019), "Study on the creep behaviors of interactive marine-terrestrial deposit soils", Adv. Civil Eng., 1-14. https://doi.org/10.1155/2019/6042893.   DOI
13 Kim, D.K. (2005), "Comparisons of overstress theory with an empirical model in creep prediction for cohesive soils", KSCE J. Civil Eng., 9(6), 489-494. https://doi.org/10.1007/bf02831485.   DOI
14 Liu, Y.F. (2020), "Experimental study on consolidation rheological properties of Cangzhou coastal", Ph.D. Dissertation, North China University of Water Resources and Electric Power. Zhengzhou, Henan, China.
15 Chen, B., Xu, Q. and Sun, D.A. (2014), "An elastoplastic model for structured clays", Geomech. Eng., 7(2), 213-231. http://dx.doi.org/ 10.12989/gae.2014.7.2.213.   DOI
16 Chen, Z.J., Feng, W.Q. and Yin, J.H. (2021), "A new simplified method for calculating short-term and long-term consolidation settlements of multi-layered soils considering creep limit", Comput. Geotech., 138, 104324. https://doi.org/10.1016/j.compgeo.2021.104324.   DOI
17 Dong, W.J. (2007), "Study on the laboratory test of rheological characteristic of soft clay and long-term strength", Ph.D. Dissertation, Hohai University, Nanjing, Jiangsu, China.
18 Hawlader, B.C., Muhunthan, B. and Imai, G. (2003), "Viscosity effects on one-dimensional consolidation of clay", Int. J. Geomech., 3(1), 99-110. https://doi.org/10.1061/(ASCE)1532-3641(2003)3:1(99).   DOI
19 Krogsboll, A. (1998), "Constitutive model with time-dependent deformations", Eng. Geol., 49(3-4), 285-292. https://doi.org/10.1016/s0013-7952(97)00060-4.   DOI
20 Lin, H.D. and Wang, C.C. (1998), "Stress-strain-time function of clay", J. Geotech. Geoenviron. Eng., 124(4), 289-296. https://doi.org/10.1061/(ASCE) 1090-0241(1998)124:4(289).   DOI
21 Roscoe, K.H. and Burland, JB. (1968), Engineering Plasticity, Cambridge University Press, Cambridge, England.
22 Liu, W.Z., Shi, Z.G., Zhang, J.H. and Zhang, D.W. (2019), "One-dimensional nonlinear consolidation behavior of structured soft clay under time-dependent loading", Geomech. Eng., 18(3), 299-313. https://doi.org/ 10.12989/gae.2019.18.3.299.   DOI
23 Hessam, Y. and Mohammad, M.T. (2012), "Nonlinear consolidation of soft clays subjected to cyclic loading-part II: verification and application", Geomech. Eng., 4(4), 243-249. https://doi.org/ 10.12989/gae.2012.4.4.243.   DOI
24 Mataic, I., Wang, D. and Korkiala-Tanttu, L. (2016), "Effect of destructuration on the compressibility of Pernio clay in incremental loading oedometer tests", Int. J. Geomech., 16(1), 04015016. https://doi.org/10.1061/ (ASCE)GM.1943-5622.0000486.   DOI
25 Yin, J.H. and Zhu, J.G. (1999), "Measured and predicted time-dependent stress-strain behavior of Hong Kong marine deposits", Can. Geotech. J., 36, 760-766. https://doi.org/10.1139/t99-043.   DOI
26 Mesri, G. Eehres-Cordero, E. and Shields, D.R. (1981), "Shear stress-strain-time behaviour of clays", Geoechnique, 31(4), 537-552. https://doi.org/10.1680/geot.1981.31.4.537.   DOI
27 Singh, A. and Mitchell, J.K. (1968), "General stress-strain-time function for soils", J. Soil Mech. Found. Div., 94(1), 21-46. https://doi.org/10.1061/JSFEAQ. 0001084   DOI
28 Thu, M.L., Behzad, F., Mahdi, D. and Hadi, K. (2015), "Analyzing consolidation data to obtain elastic viscoplastic parameters of clay", Geomech. Eng., 8(4), 559-594. https://doi.org/10.12989/gae.2015.8.4.559.   DOI
29 Yin, J.H. and Graham, J. (1989), "Viscous-elastic-plastic modelling of one dimensional time-dependent behavior of clays", Can. Geotech. J., 26, 199-209. https://doi.org/10.1139/t89-029.   DOI
30 Vialov. (1987). Rheological principles of soil mechanics. Science Press, Beijing, China.
31 Yin, J.H. and Graham, J. (1999), "Elastic visco-plastic modelling of the time-dependent stress-strain behavior of soils", Can. Geotech. J., 36, 736-745. https://doi.org/10.1139/t99-042.   DOI
32 Yin, J.H. (2015), "Fundamental issues of elastic viscoplastic modeling of the time-dependent stress-strain behavior of geomaterials", Int. J. Geomech., 15(5), A4015002. https://doi.org/10.1061/(ASCE)gm.1943-5622.0000485.   DOI
33 Zhao, T.B., Zhang, Y.B., Zhang, Q.Q. and Tan, Y.L. (2018), "Analysis on the creep response of bolted rock using bolted burgers model", Geomech. Eng., 14(2), 141-149. https://10.12989/gae.2018.14.2.141.   DOI
34 Zhu, J.G. (2000), "Rheological behavior and elastic viscoplastic modelling of soil", Ph.D. Dissertation, The Hong Kong Polytechnic University, Hong Kong, China.