Mechanical degradation characterization in remolded moraine soils and microstructure evolution under freeze?thaw cycles
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Tuo LU1,2,3,4, Yongbo TIE1,2,3, Sai K. VANAPALLI4, Zhaoyu LI1,2. Mechanical degradation characterization in remolded moraine soils and microstructure evolution under freeze?thaw cycles[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .
@article{title="Mechanical degradation characterization in remolded moraine soils and microstructure evolution under freeze?thaw cycles",
author="Tuo LU1,2,3,4, Yongbo TIE1,2,3, Sai K. VANAPALLI4, Zhaoyu LI1,2",
journal="Journal of Zhejiang University Science A",
volume="-1",
number="-1",
pages="",
year="1998",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2500676"
}
%0 Journal Article
%T Mechanical degradation characterization in remolded moraine soils and microstructure evolution under freeze?thaw cycles
%A Tuo LU1
%A 2
%A 3
%A 4
%A Yongbo TIE1
%A 2
%A 3
%A Sai K. VANAPALLI4
%A Zhaoyu LI1
%A 2
%J Journal of Zhejiang University SCIENCE A
%V -1
%N -1
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%@ 1673-565X
%D 1998
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2500676
TY - JOUR
T1 - Mechanical degradation characterization in remolded moraine soils and microstructure evolution under freeze?thaw cycles
A1 - Tuo LU1
A1 - 2
A1 - 3
A1 - 4
A1 - Yongbo TIE1
A1 - 2
A1 - 3
A1 - Sai K. VANAPALLI4
A1 - Zhaoyu LI1
A1 - 2
J0 - Journal of Zhejiang University Science A
VL - -1
IS - -1
SP -
EP - 0
%@ 1673-565X
Y1 - 1998
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2500676
Abstract: Remolded moraine soils are highly susceptible to degradation caused by freeze?thaw (F-T) cycles, posing significant risks to the stability of slopes in hilly regions. This study investigates the mechanical degradation and microstructural changes induced by F-T cycles through a comprehensive experimental program, including F-T cycle tests, triaxial shear tests (TSTs), unconfined compression tests (UCTs), and micro-CT scanning of moraine soil from southeast Xizang. The results reveal three stages of mechanical parameter degradation: rapid decline, moderate reduction, and plateau. Cohesion, initial average elastic modulus, and strength decrease significantly under low confining pressure (40~50% reduction), while the decrease is less pronounced under higher pressures (30~10%). micro-CT scanning shows a clear evolution in the microstructure, with the porosity increasing from 14.25% to 18.69% and the pore-crack size rising from 69.83 µm to 90.44 µm. These microstructural changes are identified as the primary mechanism behind macroscopic degradation. A novel gray model (LGM) was developed to predict mechanical parameter evolution, showing high accuracy for predicting the strength of moraine soils in later F-T cycles (e.g., 15th, 20th, and beyond). The LGM model provides valuable insights for the design of moraine slopes and infrastructure subjected to freeze-thaw conditions.
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