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A Disturbed State Concept-Based Stress-Relaxation Model for Expansive Soil Exposed to Freeze-Thaw Cycling.
- Source :
- KSCE Journal of Civil Engineering; Sep2020, Vol. 24 Issue 9, p2621-2630, 10p
- Publication Year :
- 2020
-
Abstract
- The impact of periodic freezing-thawing cycling on the stress-relaxation behavior of expansive soil, which was discovered during the construction of the Harbin-Jiamusi high-speed railway, was investigated in this paper. The laboratory tests associated with this study involved X-ray diffraction (XRD), thermal analysis, and direct shear testing. Test results indicate that shear stress decreases gradually in line with the number of freeze-thaw (F-T) cycling (N<subscript>FT</subscript>). When the N<subscript>FT</subscript> exceeds 7, F-T cycling no longer has any observably significant influence on the shear stress. The relaxation rate decreases during the first F-T cycle, after which almost no appreciable effect from F-T cycling is visible. It is concluded that, during the relaxation process, the shear stress decreases gradually and tends towards a stable value. A three stage process for the stress relaxation of soil samples affected by F-T cycling was observed: instantaneous relaxation; attenuated relaxation; and steady relaxation. Based on the experimental results, a disturbed state concept (DSC)-based stress-relaxation model for expansive soil exposed to freeze-thaw cycling was proposed. Close agreement between the experimental data and results predicted according to the model confirms the model's validity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 12267988
- Volume :
- 24
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- KSCE Journal of Civil Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 147250574
- Full Text :
- https://doi.org/10.1007/s12205-020-2000-3