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Undrained response of reconstituted clay to cyclic pure principal stress rotation

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Abstract

A series of monotonic and rotational shearing tests are carried out on reconstituted clay using a hollow cylinder apparatus under undrained condition. In the rotational shearing tests, the principal stress axes rotate cyclically with the magnitudes of the principal stresses keeping constant. The anisotropy of the reconstituted clay is analyzed from the monotonic shearing tests. Obvious pore pressure is induced by the principal stress rotation alone even with shear stress q 0=5 kPa. Strain components also accumulate with increasing the number of cycles and increases suddenly at the onset of failure. The deviatoric shear strain of 7.5% can be taken as the failure criterion for clay subjected to the pure cyclic principal stress rotation. The intermediate principal stress parameter b plays a significant role in the development of pore pressure and strain. Specimens are weakened by cyclic rotational shearing as the shear modulus decreases with increasing the number of cycles, and the shear modulus reduces more quickly with larger b. Clear deviation between the directions of the principal plastic strain increment and the principal stress is observed during pure principal stress rotation. Both the coaxial and non-coaxial plastic mechanisms should be taken into consideration to simulate the deformation behavior of clay under pure principal stress rotation. The mechanism of the soil response to the pure principal stress rotation is discussed based on the experimental observations.

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Authors and Affiliations

  1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, 310058, China

    Jia-jia Yan  (严佳佳), Jian Zhou  (周建), Xiao-nan Gong  (龚晓南) & Yang Cao  (曹洋)

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  1. Jia-jia Yan  (严佳佳)
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  2. Jian Zhou  (周建)
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  3. Xiao-nan Gong  (龚晓南)
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  4. Yang Cao  (曹洋)
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Correspondence to Jian Zhou  (周建).

Additional information

Foundation item: Projects(51338009, 51178422) supported by the National Natural Science Foundation of China

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Yan, Jj., Zhou, J., Gong, Xn. et al. Undrained response of reconstituted clay to cyclic pure principal stress rotation. J. Cent. South Univ. 22, 280–289 (2015). https://doi.org/10.1007/s11771-015-2519-5

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  • DOI: https://doi.org/10.1007/s11771-015-2519-5

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