Permanent deformation characteristics of saturated sand under cyclic loading

Author:

Cai Yuanqiang1,Sun Qi2,Guo Lin3,Juang C. Hsein4,Wang Jun3

Affiliation:

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, P.R. China; College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, P.R. China.

2. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, P.R. China.

3. College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, P.R. China.

4. Glenn Department of Civil Engineering, Clemson University, Clemson, SC 29634, USA.

Abstract

The loading path involving principal stress rotation (PSR) during shear is an important phenomenon encountered in many field conditions. Typically for traffic loading, both the magnitude and direction of principal stresses may vary with time due to the motion of vehicles, and the stress path can be mimicked by a heart shape in the deviatoric stress space. Conventional triaxial tests are not suitable to recreate this type of stress path in that no torsional shear stress can be applied on the test samples. To overcome this limitation, a series of tests using a hollow cylinder apparatus were conducted on sand to investigate the permanent deformation characteristics under drained conditions with different levels of confining pressure (σc), cyclic vertical stress ratio (CVSR), and cyclic torsional stress ratio (η). The results clearly show an increase in the permanent deformation with η, indicating that the PSR effect on permanent deformation cannot be ignored. Both σc and CVSR were found to also affect permanent deformation, which was more pronounced when PSR was coupled into the test. A five-parameter formulation that accounted for the effect of confining pressure, deviatoric stress, torsional shear stress, and number of loading cycles was subsequently established to analyze the permanent strain. The formulation coefficients were first determined and then used to explain the effects of stress variables on the permanent deformation. Validation studies were performed to address the adequacy of the formulation to predict permanent deformation.

Publisher

Canadian Science Publishing

Subject

Civil and Structural Engineering,Geotechnical Engineering and Engineering Geology

Reference30 articles.

1. Cai, Y.Y. 2010. An experimental study of non-coaxial soil behavior using hollow cylinder testing. Ph.D. thesis, University of Nottingham.

2. Traffic-Load-Induced Permanent Deformation of Road on Soft Subsoil

3. Effects of initial static shear on liquefaction and large deformation properties of loose saturated Toyoura sand in undrained cyclic torsional shear tests

4. Strain localization characteristics of loose saturated Toyoura sand in undrained cyclic torsional shear tests with initial static shear

5. Gräbe, P.J. 2002. Resilient and permanent deformation of railway foundations under principal stress rotation. Ph.D. thesis, University of Southampton.

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