Three-dimensional discrete-continuous coupled numerical simulation of a single stone column in soft soils

TAN Xin; HU Zheng-bo; FENG Long-jian; ZHAO Ming-hua

doi:10.11779/CJGE202102015

Volume 43 Issue 2

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Chinese Journal of Geotechnical Engineering > 2021 > 43(2): 347-355. > DOI: 10.11779/CJGE202102015

TAN Xin, HU Zheng-bo, FENG Long-jian, ZHAO Ming-hua. Three-dimensional discrete-continuous coupled numerical simulation of a single stone column in soft soils[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(2): 347-355. DOI: 10.11779/CJGE202102015

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Three-dimensional discrete-continuous coupled numerical simulation of a single stone column in soft soils

1.
College of Civil Engineering, Hunan University, Changsha 410082, China
2.
Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, Hunan University, Changsha 410082, China

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Received Date: April 08, 2020
Available Online: December 04, 2022

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Abstract

Abstract

The discrete-continuous coupled numerical model is used to simulate the complete bearing and failure process of a single stone column in soft soils. The three-dimensional polyhedron considering the actual gravel shape is used to simulate the stone column, and the finite difference grid is used to model the soft soils. The load-settlement curve and bulging deformation curves obtained by the numerical simulation are in good agreement with the model test results. The stone column modeled by the discrete element method can effectively reflect its deformation and failure characteristics, without using complex constitutive model. The column-soil interactions can be well revealed by the coupled simulation scheme. The bearing and failure process is summarized through the analysis on the load-settlement curve, the stress and strain field of the surrounding soils, and the contact force chains of the stone column. The relationship between the macroscopic deformation and failure behaviors of the stone column and the microscopic grain movement is summarized. The bearing mechanism of the stone column can be well explained according to the structure and shape of the force chain networks inside the column body.
- stone column,
- force chain,
- grain,
- discrete element method,
- numerical simulation

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References (20)

References

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