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Influence of principal stress rotation of unequal tensile and compressive stress amplitudes on characteristics of soft clay

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Abstract

Soil behavior can reflect the characteristics of principal stress rotation under dynamic wave and traffic loads. Unequal amplitudes of tensile and compressive stresses applied to soils have complex effects on foundation soils in comparison with the pure principal stress rotation path. A series of undrained cyclic hollow torsional shear tests were performed on typical remolded soft clay from the Ilexi area of Nanjing, China. The main control parameters were the tensile and compressive stress amplitude ratio (α) and the cyclic dynamic stress ratio (η). It was found that the critical η tended to remain constant at 0.13, when the value of the compressive stress amplitude was higher than the tensile stress amplitude. However, the influence of the tensile stress was limited by the dynamic stress level when α= 1. For obvious structural change in the soil, the corresponding numbers of cyclic vibration cycles were found to be independent of α at low stress levels and were only related to η. Finally, a new method for evaluating the failure of remolded soft clay was presented. It considers the influence of the tensile and compressive stresses which caused by complex paths of the principal stress rotation. This criterion can distinguish stable, critical, and destructive states based on the pore-water-pressure-strain coupling curve while also providing a range of failure strain and vibration cycles. These results provide the theoretical support for systematic studies of principal stress rotation using constitu tive models.

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Acknowledgements

The authors would like to acknowledge the financial support of the National Natural Science Foundation of China (51420105013 and 51479060), Fundamental Research Funds for the Central Universities (2015B17114) and Science and Technology Project of Shandong Housing and Urban-Rural Development (2014QG009).

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Authors and Affiliations

  1. Key Laboratory of Geomechanics and Embankment Engineering of Ministry of Education, Hohai University, Nanjing, 210098, China

    Yang Shen, Xin Wang, Han-long Liu, Wen-han Du, Bao-guang Wang & Hai-dong Xu

  2. Jinan Rail Transit Group Co., Ltd, Jinan, 250100, China

    Xin Wang

  3. School of Civil Engineering, Chongqing University, Chongqing, 400044, China

    Han-long Liu

Authors
  1. Yang Shen
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  2. Xin Wang
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  3. Han-long Liu
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  4. Wen-han Du
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  5. Bao-guang Wang
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  6. Hai-dong Xu
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Correspondence to Yang Shen.

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http://orcid.org/0000-0003-2776-4169

http://orcid.org/0000-0002-6413-7394

http://orcid.org/0000-0001-9611-339X

http://orcid.org/0000-0003-4061-8430

http://orcid.org/0000-0002-7196-1920

http://orcid.org/0000-0003-4281-9500

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Shen, Y., Wang, X., Liu, Hl. et al. Influence of principal stress rotation of unequal tensile and compressive stress amplitudes on characteristics of soft clay. J. Mt. Sci. 14, 369–381 (2017). https://doi.org/10.1007/s11629-016-4000-9

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  • DOI: https://doi.org/10.1007/s11629-016-4000-9

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