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Experimental investigation on strength behavior of reconstituted Zhenjiang clay under different consolidation stress paths

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Abstract

Soils subjected to the loading or unloading in geotechnical engineering applications like foundation excavation, embankment, and tunnel construction will reconsolidate under different stress paths. This paper presents an experimental investigation on the effect of stress path on shear strength characteristic of reconstituted Zhenjiang clay. Specimens were isotropically or anisotropically consolidated and sheared without drainage in triaxial shear tests. Test results showed that undrained shear strength (Su) under various stress paths is markedly influenced by the stress ratio (η), which is defined as the ratio of the deviator stress to the mean effective stress (p′). Su almost linearly increases with p′ or η at a given η or p′. The value of Su for specimens consolidated under different stress paths can be predicted as a function of p′ and η, i.e., Su = (0.13η + 0.37)p′. It is concluded that Su of specimen under anisotropic consolidation is higher than that under isotropic consolidation at a certain p′. Moreover, specimen anisotropically consolidated to the same p′ at higher η results in an increase in Su compared with that at lower η. Duncan-Chang model can be employed to characterize the strength behavior of reconstituted clays under various consolidation stress paths. The variation of c or c′ is insignificant under different η, indicating that the effect of η on cohesion is negligible. φ increases linearly with η while φ′ shows an insignificant change.

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Abbreviations

c :

Total cohesion

c′:

Effective cohesion

E i :

Initial modulus

ε a :

Aial strain

φ :

Total internal friction angle

φ′:

Effective internal friction angle

G s :

Specific gravity

η :

Stress ratio (=q/p′)

K 0 :

Coefficient of earth pressure at rest

K :

Modulus number

LL:

Liquid limit

n :

Modulus exponent

\( {\sigma}_1^{\prime } \) :

Major effective principal stress

\( {\sigma}_3^{\prime } \) :

Minor effective principal stress

PL:

Plastic limit

p′:

Mean effective stress [=(\( {\sigma}_1^{\prime } \)+2\( {\sigma}_3^{\prime } \))/3]

q :

Deviator stress (=\( {\sigma}_1^{\prime }-{\sigma}_3^{\prime } \))

R f :

Failure ratio

S u :

undrained shear strength

w 0 :

Initial water content

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Funding

We gratefully appreciate the financial supports from the National Natural Science Foundation of China (No. 51978315 and No. 41402251). The first author also acknowledges the support from China Scholarship Council (No. 201908320213) for visiting the University of Wisconsin-Madison as a Research Scholar.

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Authors and Affiliations

  1. Department of Civil Engineering, Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, 212013, China

    Jie Yin, A-long Zhao & Yong-hong Miao

  2. Department of Civil and Environmental Engineering, University of Wisconsin–Madison, Madison, WI, 53706, USA

    Jie Yin

  3. Department of Civil Engineering, Jiangsu Urban and Rural Construction College, Changzhou, 213147, China

    Wen-xia Han & Jian **ao

  4. Department of Bridge Engineering, College of Civil Engineering, Tongji University, Shanghai, 200092, China

    Shoaib Ahmed

Authors
  1. Jie Yin
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  2. A-long Zhao
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  3. Wen-xia Han
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  4. Jian **ao
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  5. Shoaib Ahmed
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  6. Yong-hong Miao
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Corresponding author

Correspondence to Jie Yin.

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Responsible Editor: Zeynal Abiddin Erguler

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Yin, J., Zhao, Al., Han, Wx. et al. Experimental investigation on strength behavior of reconstituted Zhenjiang clay under different consolidation stress paths. Arab J Geosci 14, 109 (2021). https://doi.org/10.1007/s12517-020-06424-1

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  • DOI: https://doi.org/10.1007/s12517-020-06424-1

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