主应力轴旋转条件下软黏土的非共轴研究

doi:10.13722/j.cnki.jrme.2014.0964

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Abstract A series of undrained tests were carried out on Hangzhou soft clay with a hollow cylinder apparatu，and the elastic parameters were obtained at first，on the basis of which the non-coaxial development behavior of soft clay was studied as well as the influence of intermediate principal stress parameter，elastic strains，intermediate principal stress parameter，deviatoric stress and induced anisotropy on non-coaxiality. The results show that the non-coaxiality of soft clay is similar to that of sand，but they are far from identical. Regardless of intact soft clay or remodeled soft clay，the non-coaxial angle fluctuates with the increase of angle of principal stress，of which the cycle period is 90°. The non-coaxial angle basically decreases with the increase of intermediate principal stress parameter. The elastic strains have a significant effect on the angle of non-coaxiality at the beginning of loading，and it will overestimate the non-coaxiality of soft clay if not considering the elastic strains. The deviatoric stress has certain effect on the angle of non-coaxial as well as its development trend，and the larger the deviatoric stress is，the smaller the angle of non-coaxiality is. As to the test of remodeled soft clay，it shows that the non-coaxiality is not only entirely determined by the inherent anisotropy，the induced anisotropy also has a great impact.

Key words： soft clay non-coaxiality elastic parameter principal stress rotation

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0964 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/I6/21

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