Mechanism of correlation between particle motion and compaction characteristics in gyratory compaction
Li-cai ZHAO1,2(),Yu-xin BIAN3
1. Department of Civil and Construction Engineering, Taiwan University of Science and Technology, Taipei 106335, China 2. China Railway 19th Bureau Group Third Engineering Company Limited, Shenyang 110136, China 3. College of Architecture and Urban-Rural Planning, Sichuan Agricultural University, Chengdu 611830, China
To reveal the compaction mechanism of graded aggregates from the perspective of particle motion, polyhedral aggregate specimens were constructed considering the real shape characteristics of aggregates based on the discrete element numerical simulation method. Through the virtual gyratory compaction test, the motion characteristics of the aggregates at different positions of the graded aggregate specimens during the compaction process were investigated. And the correlation mechanism between the particle motion and the compaction characteristics of the graded aggregates were revealed during the gyratory compaction process from a fine viewpoint. Results show that the particle motion responses of all parts of the compacted specimens show similar patterns, and the particle motion and compaction characteristics at intermediate positions can assess the compaction quality of the specimens. The compaction stage can be divided into four stages: initial compaction, transition compaction, locking and compaction. The locking point of particle motion appears at the end of the locking stage, and the appearance of the locking point can be used as a sign that the specimen enters the compacting stage. The particle motion characteristics are superior to the change in porosity inside the specimen to evaluate the compaction quality.
Li-cai ZHAO,Yu-xin BIAN. Mechanism of correlation between particle motion and compaction characteristics in gyratory compaction. Journal of ZheJiang University (Engineering Science), 2022, 56(12): 2471-2477.
Fig.1Different aggregate shapes for graded aggregates
d/mm
P/%
d/mm
P/%
d/mm
P/%
d/mm
P/%
22.40
100
16.00
83.0
9.50
50.0
2.36
0.5
19.00
92.0
13.20
75.0
4.75
12.0
1.60
0
Tab.1Virtual polyhedral specimen particle grading
Fig.2Polyhedral aggregate generation and virtual model construction
Fig.3Polyhedral aggregates of different particle sizes
Fig.4Linear contact model meso-scale components
Fig.5Particle movement monitoring points and gyratory compaction flow chart
Fig.6Variation curve of compaction height and porosity with gyratory compaction times
Fig.7 Variation curve of euler angle with gyratory compaction times at monitoring point 2
Fig.8Variation curve of particles’ relative rotation angle with gyratory compaction times at each monitoring position
Fig.9Division of compaction stages according to relative angle variation characteristics
Fig.10Variation curve of particles ’ relative rotation angle with gyratory compaction times at central monitoring position
Fig.11Schematic diagram of particle attitude adjustment during compaction of graded aggregates
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