Analysis of cement-treated clay behavior by micromechanical approach

doi:10.1007/s11709-013-0204-z

Front Struc Civil Eng

2013, Vol. 7

Issue (2) : 137-153 https://doi.org/10.1007/s11709-013-0204-z

RESEARCH ARTICLE

Analysis of cement-treated clay behavior by micromechanical approach

Dong-Mei ZHANG¹, Zhen-Yu YIN², Pierre-Yves HICHER^1,3(

), Hong-Wei HUANG¹

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 3. Research Institute in Civil and Mechanical Engineering, UMR CNRS 6183, Ecole Centrale de Nantes, BP 92101, Nantes 44321, France

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Abstract

Experimental results show the significant influence of cement content on the mechanical properties of cement-treated clays. Cementation is produced by mixing a certain amount of cement with the saturated clay. The purpose of this paper is to model the cementation effect on the mechanical behavior of cement-treated clay. A micromechanical stress-strain model is developed considering explicitly the cementation at inter-cluster contacts. The inter-cluster bonding and debonding during mechanical loading are introduced in two ways: an additional cohesion in the shear sliding and a higher yield stress in normal compression. The model is used to simulate isotropic compression and undrained triaxial tests under various confining stresses on cement-treated Ariake clay and Singapore clay with various cement contents. The applicability of the present model is evaluated through comparisons between numerical and experimental results. The evolution of local stresses and local strains in inter-cluster planes are discussed in order to explain the induced anisotropy due to debonding at contact level under the applied loads. The numerical simulations demonstrate that the proposed micromechanical approach is well adapted for taking into account the main physical properties of cement-treated clay, including damage and induced anisotropy under mechanical loading.

Keywords microstructure cementation clay micromechanics anisotropy debonding

Corresponding Author(s): HICHER Pierre-Yves,Email:pierre-yves.hicher@ec-nantes.fr

Issue Date: 05 June 2013

Cite this article:

Dong-Mei ZHANG,Zhen-Yu YIN,Pierre-Yves HICHER, et al. Analysis of cement-treated clay behavior by micromechanical approach[J]. Front Struc Civil Eng, 2013, 7(2): 137-153.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-013-0204-z
https://academic.hep.com.cn/fsce/EN/Y2013/V7/I2/137

Fig.1 (a) Microfabric of uncemented clay and structure of induced cemented clay (after Horpibulsuk et al. []); (b) SEM images of 10% and 50% cement-treated clay at 28-day curing (after Kamruzzaman et al. [])

Tab.1 Index properties of Ariake clay and Singapore clay

Fig.2 Effect of cement content on properties of cement treated clays. (a) Swelling index; (b) bonding pressure; (c) friction angle at failure, and (d) apparent bonding cohesion

Fig.3 Effect of cement content on the location of critical state line. (a) For cement treated Ariake clay; (b) for cement treated Singapore clay; (c) reference critical void ratio versus cement content

Fig.4 Effect of cement content on the location of critical state line. (a) For cement treated Ariake clay; (b) for cement treated Singapore clay; (c) reference critical void ratio versus cement content

Fig.5 Local coordinate at inter-particle contact

Tab.2 Values of model parameters for cement-treated clays

Fig.6 Compression behavior. (a) Effect of on destructuration; (b) cement-treated Ariake clay; (c) cement-treated Singapore clay

Fig.7 Parametric study for undrained shearing behavior. (a)-(b) effect of ; (c)-(d) effect of ; (e)-(f) coupling effect for and

Fig.8 Comparisons between experiments and simulations for undrained shearing tests on cement treated Ariake clay with cement content of (1) 0%; (2) 6%; (3) 9%, (4) 12%, (5)18%. (a) Effective stress path; (b) deviatoric stress versus axial strain; (c) excess pore pressure versus axial strain

Fig.9 Comparisons between experiments and simulations for undrained shearing tests on cement treated Singapore clay with cement content of (1) 10%; (2) 30%; (3) 50%. (a) Effective stress path; (b) deviatoric stress versus axial strain; (c) excess pore pressure versus axial strain

Fig.10 Effect of cement content on undrained shearing behavior of cement treated Ariake clay for tests under confining pressure of 200 kPa. (a)-(c) Experimental results, (d)-(f) calculated results

Fig.11 Effect of cement content on undrained shearing behavior of cement treated Singapore clay for tests under confining pressure of 500 kPa: comparisons of (a) effective stress path; (b) deviatoric stress versus axial strain; (c) excess pore pressure versus axial strain

Fig.12 Local stress-strain behavior for selected tests. (a) Stress path in shear stress versus normal stress; (b) shear stress versus shear strain; (c) normal strain versus normal stress

Fig.13 Local bond degradation for selected test. (a)-(b) shear bond cohesion versus global axial strain, and (c) normal bonding ratio versus global axial strain

Fig.14 Local stresses, strains and bonds distributions in rose diagram. (a) For normal stress; (b) for shear stress; (c) for shear strain; (d) for shear bond cohesion

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