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http://hdl.handle.net/10397/89502
Title: | Effects of soil structure on thermal softening of yield stress | Authors: | Cheng, Q Zhou, C Ng, CWW Tang, CS |
Issue Date: | May-2020 | Source: | Engineering geology, May 2020, v. 269, 105544 | Abstract: | Thermal softening is generally referred as the reduction of yield stress with increasing temperature. Previous experimental studies of thermal softening focus on a single type of specimen (either intact or recompacted). In this study, thermal softening of saturated intact, recompacted and reconstituted loess specimens was investigated through temperature-controlled isotropic compression tests. Scanning electron microscope (SEM) measurements were also carried out to evaluate the microstructures of these specimens. It is found when soil temperature increases from 5 to 50 °C, the yield stresses of the intact, recompacted and reconstituted specimens decreased by about 33%, 46% and 51%, respectively. The most resistant structure of intact specimen to thermal softening is mainly because its inter-particle contacts are stabilized by clay aggregates, as evident by SEM results. Reconstituted specimen has the least resistant structure to thermal softening, mainly because clay particles in reconstituted specimen float on the surface of silt particles rather than at inter-particle contacts. | Keywords: | Loess Structure Temperature Yielding |
Publisher: | Elsevier | Journal: | Engineering geology | ISSN: | 0013-7952 | EISSN: | 1872-6917 | DOI: | 10.1016/j.enggeo.2020.105544 | Rights: | © 2020 Elsevier B.V. All rights reserved. © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Cheng, Q., Zhou, C., Ng, C. W. W., & Tang, C. S. (2020). Effects of soil structure on thermal softening of yield stress. Engineering Geology, 269, 105544 is available at https://dx.doi.org/10.1016/j.enggeo.2020.105544. |
Appears in Collections: | Journal/Magazine Article |
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