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| Discrete element modeling of undrained triaxial tests for saturated soils based on flexible coupling boundary |
| Received:September 04, 2023 Revised:December 03, 2023 |
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| DOI：10.7511/jslx20230904002 |
| KeyWord:DEM simulation flexible coupling boundary undrained triaxial tests coupling fluid method saturated soil |
| Author | Institution |
| 张杰 |
中南大学 土木工程学院, 长沙 |
| 聂如松 |
中南大学 土木工程学院, 长沙 ;中南大学 重载铁路工程结构教育部重点实验室, 长沙 |
| 谭永长 |
中南大学 土木工程学院, 长沙 |
| 李列列 |
华北水利水电大学 土木与交通学院, 郑州 |
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| Abstract: |
| Given that the flexible coupling boundary is currently unable to simulate undrained triaxial tests in the discrete element method(DEM),the coupled fluid method(CFM) is integrated with a method for constructing a flexible coupled boundary,thereby extending the flexible coupling boundary to undrained triaxial simulations.Firstly,the CFM is used to simulate undrained triaxial tests of saturated soil with a rigid boundary,and the results are compared with the constant volume technique(CVM) to verify the reliability of the CFM.Secondly,the CU triaxial test simulation of saturated soil with a flexible coupling boundary is performed,and the simulation results are compared with those with a rigid boundary to demonstrate the advantages of a flexible boundary.Finally,the CFM-DEM model with a flexible coupled boundary is further used to simulate the CU triaxial tests of saturated soil with different initial porosity,and the undrained shear characteristics of specimens are investigated.The results reveal that the proposed method can reproduce the transformation of stress paths of specimens caused by porosity in laboratory triaxial tests,which proves the effectiveness of the proposed method.This method provides a foundation for future mesoscopic understanding of the undrained shear characteristics of saturated soils. |
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