True triaxial tests on frozen sandy soil under different intermediate principal stress coefficients and negative temperatures

MA Qin-yong; HUANG Kun; MA Dong-dong; YAO Zhao-ming; ZHOU Zhao-xi

doi:10.11779/CJGE202205010

Volume 44 Issue 5

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Chinese Journal of Geotechnical Engineering > 2022 > 44(5): 870-878. > DOI: 10.11779/CJGE202205010

MA Qin-yong, HUANG Kun, MA Dong-dong, YAO Zhao-ming, ZHOU Zhao-xi. True triaxial tests on frozen sandy soil under different intermediate principal stress coefficients and negative temperatures[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(5): 870-878. DOI: 10.11779/CJGE202205010

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True triaxial tests on frozen sandy soil under different intermediate principal stress coefficients and negative temperatures

MA Qin-yong^{1, 2, 3,},
HUANG Kun^{1, 2, 3, ,},
MA Dong-dong^{1, 2, 3},
YAO Zhao-ming^{1, 2, 3},
ZHOU Zhao-xi^{1, 2, 3}

1.
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology, Huainan 232001, China
2.
Engineering Research Center of Underground Mine Construction, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China
3.
School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China

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Received Date: June 21, 2021
Available Online: September 22, 2022

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Abstract

Abstract

To study the mechanical properties of frozen soil under complex stress paths, the effects of negative temperature and intermediate principal stress coefficient (b_f) on the strength and deformation characteristics of frozen sandy soil are studied by using the self-developed true triaxial apparatus. The test results show that the stress-strain relationship under different b_f values exhibits strain hardening characteristics under three dimensional stress states. The failure strength increases with b_f increasing from 0 to 0.5 and then decreases when b is in the range of 0.5~1. However, the values are still greater than those under the axial-symmetric stress state (b_f = 0). The strength increases linearly with the decline of the negative temperature. With the increase in b_f, the deformation in the direction of the intermediate principal stress changes from dilative to compressive and that in the direction of the minor principal stress remains dilative throughout. All the volumetric strain curves demonstrate the characteristics of shear shrinkage first and then dilatancy. The test points in the range of 30%~95% stress level are suitable for calculating the Duncan-Chang model parameters.
- true triaxial test,
- frozen sandy soil,
- intermediate principal stress coefficient,
- mechanical property,
- Duncan-Chang model

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