Zuo, Lu;
Xu, Ling;
Baudet, Béatrice Anne;
Gao, Chongyang;
Huang, Chuang;
(2022)
Small-strain shear stiffness anisotropy of a saturated clayey loess.
Géotechnique
10.1680/jgeot.21.00179.
(In press).
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Abstract
The mechanical behaviour of clayey loess is strongly affected by the soil structure, but although anisotropy has been identified in loess by some, the anisotropy of small-strain behaviour is rarely reported. This paper presents an experimental study on the inherent and stress-induced small-strain shear stiffness anisotropy of a clayey loess from China. Both undisturbed and reconstituted specimens were tested with bender elements under isotropic compression and shearing conditions. Under an isotropic stress state, an inherent anisotropy was found for undisturbed specimens, while the reconstituted specimens prepared by moist tamping behaved isotropically. During shearing, the ratio of horizontal to vertical shear moduli of the undisturbed specimens decreased due to both an increase of stress anisotropy and the destruction of the intact structure. In contrast, the stiffness ratio of the reconstituted specimens only decreased due to stress anisotropy and it became more anisotropic at the critical state. This study reveals the influence of intact structure and inherent anisotropy on the behaviour of loess soils, which cannot be reproduced by compaction, thus highlighting the importance of characterising the undisturbed loess.
| Type: | Article |
|---|---|
| Title: | Small-strain shear stiffness anisotropy of a saturated clayey loess |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1680/jgeot.21.00179 |
| Publisher version: | https://doi.org/10.1680/jgeot.21.00179 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Technology, Engineering, Geological, Engineering, anisotropy, laboratory testing, loess, small-strain stiffness, soil structure, BENDER ELEMENT TESTS, INHERENT ANISOTROPY, ELASTIC STIFFNESS, INITIAL STIFFNESS, BEHAVIOR, EVOLUTION, SOILS, STRENGTH, MODULUS, SAND |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10154324 |
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