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Indexed by:期刊论文

Date of Publication:2022-06-29

Journal:岩土力学

Issue:7

Page Number:1931-1938

ISSN No.:1000-7598

Abstract:Through a series of stress-controlled bi-directional cyclic shear tests under different three-dimensional anisotropic consolidation stress conditions on the undisturbed saturated marine soft clay from the yellow river delta area, the effects of the initial orientation angle of the maximum principal stress α0, the ratio of the two stress components R and the cyclic stress level (expressed by cyclic stress ratio Rc) on the characteristics of residual deformation of the saturated marine clay are examined. The test results show that the α0 has remarkable effect on the residual axial strain Εr caused by cyclic loading, Εr at failure and the relation between ratio of residual axial strain Εr/Εrmax and ratio of number of cycles N/Nf. Both Εr caused by cyclic loading and Εr at failure decrease with a decrease of R. At the same N/Nf, Εr/Εrmax increases at first then decreases with a decrease of R. The relation curves of Εr/Εrmax-N/Nf with different R concentrate in a narrow strip and can be expressed by a unified expression by normalizing the test data. At α0 = 0° and 90°, the differences of relation curves between residual shear strain γr and cycle number N with different values of R are not remarkable. While at α0 = 30° and 60°, the R has significant influence on the relation curves between γr and N. The differences of the variation regularities of Εr and γr under low stress level and high stress level with an increase of N are obvious. The relational expressions between Εr/Εrmax and N/Nf are proposed.

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