Bounding surface constitutive model for soft soils considering characteristics of small-strain stiffness and its application in engineering

LIANG Fayun; ZHENG Hanbo; LI Lin; WANG Rulu; YAN Jingya

doi:10.11779/CJGE20230187

Volume 46 Issue 5

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Chinese Journal of Geotechnical Engineering > 2024 > 46(5): 938-947. > DOI: 10.11779/CJGE20230187

LIANG Fayun, ZHENG Hanbo, LI Lin, WANG Rulu, YAN Jingya. Bounding surface constitutive model for soft soils considering characteristics of small-strain stiffness and its application in engineering[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(5): 938-947. DOI: 10.11779/CJGE20230187

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Bounding surface constitutive model for soft soils considering characteristics of small-strain stiffness and its application in engineering

1.
Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
2.
Highway College, Chang'an University, Xi'an 710064, China
3.
Shanghai Shentong Metro Group Co., Ltd., Shanghai 200070, China

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Received Date: March 02, 2023
Available Online: May 14, 2024

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Abstract

Abstract

The construction of an excavation pit induces complex loading-unloading stress paths in the surrounding soils, while the commonly used constitutive models are insufficient to reflect the over-consolidation and small-strain stiffness characteristics during excavation. In this study, a modified bounding surface model considering the over-consolidation and strain-stiffness relationship of soft soils is proposed by modifying the shear modulus under small-strain state. Based on the user defined material subroutine (UMAT), the modified bounding surface model is developed into the finite element software ABAQUS through an accurate and efficient semi-implicit stress update algorithm, and the numerical simulation is carried out for a deep excavation of underground station. The constitutive relationship of typical Shanghai soil under small-strain state is well predicted by the proposed model. The stress-strain curve results show that the proposed model reflects the relationship between soil strain and stiffness reasonably. Since the modified bounding surface model reasonably reflect the over-consolidation and small-strain stiffness characteristics of soil in the same time, the numerical simulation results by the proposed model satisfy the field data.
- bounding surface model,
- small-strain stiffness,
- semi-implicit stress update algorithm,
- deep excavation engineering

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References

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