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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2022, Vol. 56 Issue (12): 2471-2477    DOI: 10.3785/j.issn.1008-973X.2022.12.016
    
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
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Abstract  

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.

Key words： gyratory compaction      particle motion      compaction quality      locking point      smart compaction     
Received: 09 January 2022      Published: 03 January 2023
CLC:  U 416.1  
Fund:  辽宁省“兴辽英才计划”青年拔尖人才资助项目(XLYC2007146)
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Li-cai ZHAO
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Cite this article:

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.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.12.016     OR     https://www.zjujournals.com/eng/Y2022/V56/I12/2471


旋转压实中颗粒运动与压实特性的关联机制

为了从颗粒运动角度揭示级配碎石的压实机理，基于离散元数值模拟方法构建考虑骨料真实形状特征的多面体骨料试样. 通过虚拟旋转压实试验，研究级配碎石试样不同位置骨料在压实过程中的运动特征，从细观角度揭示级配碎石在旋转压实过程中的颗粒运动与压实特性的关联机制. 结果表明，压实试样各部分的颗粒运动响应均呈现相似的规律，中间位置的颗粒运动和压实特性可以评估试样的压实质量. 压实阶段可分成初始压实、过渡压实、锁固和压实4个阶段，颗粒运动的锁固点出现在锁固阶段结束时，锁固点的出现可以作为试样进入压密阶段的标志. 颗粒运动特征相较于试样内部孔隙率的变化，对评价压实质量更具优越性.


关键词： 旋转压实,  颗粒运动,  压实质量,  锁固点,  智能压实 
Fig.1 Different 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.1 Virtual polyhedral specimen particle grading
Fig.2 Polyhedral aggregate generation and virtual model construction
Fig.3 Polyhedral aggregates of different particle sizes
Fig.4 Linear contact model meso-scale components
Fig.5 Particle movement monitoring points and gyratory compaction flow chart
Fig.6 Variation 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.8 Variation curve of particles’ relative rotation angle with gyratory compaction times at each monitoring position
Fig.9 Division of compaction stages according to relative angle variation characteristics
Fig.10 Variation curve of particles ’ relative rotation angle with gyratory compaction times at central monitoring position
Fig.11 Schematic diagram of particle attitude adjustment during compaction of graded aggregates
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