Numerical investigation of the plastic deformation behaviour of graded crushed stone

A numerical model of the dynamic triaxial test of graded crushed stone was established based on DEM (Discrete Element Method) to study its dynamic characteristics. The influence of test conditions on simulation results was analysed through numerical simulation. A method for determining the test cond...

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Bibliographic Details
Published in:PloS one 2021-09, Vol.16 (9), p.e0258113-e0258113
Main Authors: Jiang, Ying-jun, Ni, Chen-yang, Zhang, Yu, Yi, Yong
Format: Article
Language:English
Subjects:
Aggregates
Asphalt pavements
Axial strain
Computer and Information Sciences
Crushed stone
Deformation
Diameters
Discrete element method
Dynamic characteristics
Dynamic loads
Dynamic stability
Education
Engineering
Engineering and Technology
Evaluation
Failure
Laboratories
Mathematical models
Mechanical loading
Mechanical properties
Numerical analysis
Numerical models
Numerical simulations
Physical Sciences
Plastic deformation
Plastics
Prediction models
Properties
Reliability aspects
Research and Analysis Methods
Roads & highways
Shear strength
Simulation
Stone
Test methods
Triaxial tests
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Summary:A numerical model of the dynamic triaxial test of graded crushed stone was established based on DEM (Discrete Element Method) to study its dynamic characteristics. The influence of test conditions on simulation results was analysed through numerical simulation. A method for determining the test conditions was proposed, and the reliability of the simulation was verified. We studied the accumulation rule and failure standard of permanent deformation. We then determined the critical failure stress level. The prediction model of permanent deformation cumulative failure was then established. When the calculation time step is greater than 1E-4 s per step, the stability of the dynamic triaxial numerical test of graded crushed stone is good. The plastic deformation of the simulated specimen tends to be stable under 10,000 dynamic loading cycles. When the specimen height and diameter are greater than 20 and 10 cm, respectively, the specimen size has little influence on the simulated axial strain. The recommended specimen size is 10 cm ([PHI]) x 20 cm (h). The action time curve results are consistent with indoor measurement results, which proves the simulation's reliability. The critical failure stress is approximately linearly correlated with the confining pressure, and the cumulative failure equation of plastic deformation is established.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0258113