A structural bounding surface constitutive model for unsaturated soils and its verification

WANG Chun-ying; CAI Guo-qing; HAN Bo-wen; SU Yan-lin; LI Meng-zi; LI Jian

doi:10.11779/CJGE2022S1027

Volume 44 Issue S1

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Chinese Journal of Geotechnical Engineering > 2022 > 44(S1): 148-153. > DOI: 10.11779/CJGE2022S1027

WANG Chun-ying, CAI Guo-qing, HAN Bo-wen, SU Yan-lin, LI Meng-zi, LI Jian. A structural bounding surface constitutive model for unsaturated soils and its verification[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(S1): 148-153. DOI: 10.11779/CJGE2022S1027

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A structural bounding surface constitutive model for unsaturated soils and its verification

WANG Chun-ying^{1, 2, 3,},
CAI Guo-qing^{1, 2, ,},
HAN Bo-wen^{1, 2},
SU Yan-lin^{1, 2},
LI Meng-zi^{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
3.
Tangshan Vocational & Technical College, Tangshan 063300, China

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Received Date: September 30, 2022
Available Online: February 06, 2023

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Abstract

Abstract

Most soils have both unsaturated and structural properties. The establishment of a constitutive model of unsaturated soils considering the structure is of great significance for analyzing the mechanical properties of unsaturated soils. On the basis of the volume variation equation of saturated structural soil, the influence of matrix suction is considered for the structural parameters, combined with the LC yield curve of BBM model, a new volume variation equation of unsaturated structural soil is established, and the deconstruction law is introduced to consider the structure disturbance during isotropic compression under constant suction. The structural strength and its decay law are introduced to consider the influence of the structure on the shear strength, and the deformation characteristics of the unsaturated soil in the three-dimensional state are described based on the bounding surface plasticity theory framework. Parameter calibration and model verification were carried out using the experimental data of unsaturated intact loess in Gorgan area and Xi'an Q₂ unsaturated intact loess. The results show that the established model can effectively predict the deformation characteristics of unsaturated structural soil.
- soil structure,
- unsaturated soils,
- matrix suction,
- structural parameters,
- bounding surface theory,
- constitutive model

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References (21)

References

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