Principal stress rotation and cyclic shear strength for an elliptical rotation stress path |
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| Authors: | Zhongtao Wang Andrew Chan Dan Jin |
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| Affiliation: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China;2. School of Engineering and ICT, University of Tasmania, Tasmania, Australia;3. School of Civil Engineering, Shenyang Agricultural University, Shenyang, China |
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| Abstract: | Based on the analytical solutions for wave-induced soil response in an unsaturated anisotropic seabed of finite thickness, an elliptical, i.e., noncircular rotation stress path is proven to be a more common state in a soil element with the cyclic shear stresses due to the traveling linear wave. The influence of an elliptical stress path on the characterization of failure strength is analyzed using three new parameters representing the shape, size, and the orientation of the ellipse. A series of cyclic rotational shear tests on the reconstituted specimens of Chinese Fujian Standard Sand have been performed to investigate the effect of elliptical stress path. A strength function in term of failure cycles is derived to quantify the failure strength of a given sand within a seabed subjected to regular wave loading. The results provide a basis for the evaluation of liquefaction potential of seabed but also point to a unique backbone cycle shear strength curve for soil under principal stress rotation. |
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| Keywords: | Elliptical rotation stress path failure strength principal stress rotation wave loading |
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