Rate-dependent experimental study on unsaturated coarse-grained soil controlled by matrix suction

YIN Fengjie; CAI Guoqing; SU Yanlin; SHAN Yepeng; LI Jian

doi:10.11779/CJGE2023S10013

Volume 45 Issue S1

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Chinese Journal of Geotechnical Engineering > 2023 > 45(S1): 24-28. > DOI: 10.11779/CJGE2023S10013

YIN Fengjie, CAI Guoqing, SU Yanlin, SHAN Yepeng, LI Jian. Rate-dependent experimental study on unsaturated coarse-grained soil controlled by matrix suction[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(S1): 24-28. DOI: 10.11779/CJGE2023S10013

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Rate-dependent experimental study on unsaturated coarse-grained soil controlled by matrix suction

YIN Fengjie^{1, 2,},
CAI Guoqing^{1, 2, ,},
SU Yanlin^{1, 2},
SHAN Yepeng^{1, 2},
LI Jian^{1, 2}

1.
Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
2.
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China

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Received Date: July 10, 2023
Available Online: November 23, 2023

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Abstract

Abstract

To study the time-dependent deformation characteristics of high-fill subgrade in mountainous areas, the water-retention characteristics of coarse filler and a series of rate-dependent mechanical properties tests under constant suction are carried out for the coarse filler of subgrade. Three different shear rates are used to shear the samples, and the effects of confining pressure, matrix suction and shear rate on the strength and deformation characteristics of soil are analyzed. The test results show that there is no residual suction value in the soil-water characteristic curve of coarse filler. The peak strength of coarse-grained fill under different confining pressures can be expressed as a function of matrix suction. The greater the matrix suction, the higher the shear strength of unsaturated coarse-grained soil, and the smaller the volume shear deformation. The strength and volume deformation of unsaturated coarse-grained soil are affected by the shear rate, and the change trend shows high consistency. The higher the shear rate, the higher the sample strength, and the smaller the corresponding volume deformation.
- high-fill subgrade,
- unsaturated coarse-grained soil,
- rate correlation,
- matrix suction,
- shear strength

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