Application of the Modified Mohr–Coulomb Yield Criterion in Seismic Numerical Simulation of Tunnels

To solve the classical problem that the Mohr–Coulomb yield criterion overestimates the tensile properties of geotechnical materials, a modified Mohr–Coulomb yield criterion that includes both maximum tensile stress theory and smooth processing was established herein. The modified Mohr–Coulomb consti...

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Bibliographic Details
Published in:Shock and vibration 2021, Vol.2021 (1)
Main Authors: Sui, Chuan-Yi, Shen, Yu-Sheng, Wen, Yu-Min, Gao, Bo
Format: Article
Language:English
Subjects:
Algorithms
Axial forces
Comparative analysis
Computer simulation
Constitutive models
Earthquakes
Finite element method
Mathematical models
Mechanical properties
Model testing
Mohr-Coulomb theory
Numerical analysis
Shake table tests
Simulation
Simulation methods
Stress state
Tensile properties
Tensile strength
Tensile stress
Yield criteria
Yield stress
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Summary:To solve the classical problem that the Mohr–Coulomb yield criterion overestimates the tensile properties of geotechnical materials, a modified Mohr–Coulomb yield criterion that includes both maximum tensile stress theory and smooth processing was established herein. The modified Mohr–Coulomb constitutive model is developed using the user-defined material subroutine (UMAT) available in finite element software ABAQUS, and the modified Mohr–Coulomb yield criterion is applied to construct a numerical simulation of a shaking table model test. Compared with the measured data from the shaking table test, the accuracies of the classical Mohr–Coulomb yield criterion and the modified Mohr–Coulomb yield criterion are assessed. Compared to the shaking table test, the classical Mohr–Coulomb model has a relatively large average error (−6.98% in peak acceleration values, −8.47% in displacement values, −23.93% in axial forces), while the modified Mohr–Coulomb model has a smaller average error (+2.71% in peak accelerations value, +3.19% in displacements value, +7.56% in axial forces). The results of numerical simulation using the modified Mohr–Coulomb yield criterion are closer to the measured data.
ISSN:1070-9622
1875-9203
DOI:10.1155/2021/9968935