基于实验与数值模拟的碎石振动压实影响因素探究

An experimental and numerical investigation of influencing factors of gravel vibratory compaction

Abstract: Vibration compaction is an effective method for improving sand foundations. To investigate the influence of vibration parameters and gravel gradation on vibratory compaction, a series of vibratory compaction tests with different vibration parameters and gravel gradations were carried out. A three-dimensional vibratory compaction simulator based on the discrete element software MatDEM was established. The effects of vibration frequency, nominal amplitude, and friction coefficient on final porosity were investigated. The results indicate that the vibration compaction effect is mainly determined by static pressure and excitation force, with the excitation force being the primary factor. The wider the gradation of the specimen, the lower the porosity. The lowest porosity is achieved at the vibration frequencies between 20 and 30 Hz, close to the resonance frequency. The porosity decreases with increasing amplitude in the range of 0.6–2 mm, associated with an increase in the compaction work. The vibration compaction effect is influenced by both friction coefficient and static pressure. When the friction coefficient is low, the porosity decreases with increasing static pressure. However, when the friction coefficient is great, a high static pressure produces large friction forces between particles, resulting in a greater porosity.

Keywords: Discrete element method; Gravel; Vibratory compaction; MatDEM; Influence factor

Fig.6 (a) Discrete element model for vibration compaction; (b) Position of the receivers in the model

Fig.7 Porosity variation during vibration compactions: (a) numerical simulations;(b) experimental tests.

Fig.9 Porosity comparison of tests and simulations before and after vibratory compactions.

Fig.10  Porosity of compacted models at different frequencies and times.

Zhenxing Liu, Chengzhou Fan, Yintong Min, Chun Liu, Shiguo Li, Yanxia Li, Xiaodong Liang, An experimental and numerical investigation of influencing factors of gravel vibratory compaction, Construction and Building Materials, Volume 473, 2025, 141084, ISSN 0950-0618, https://doi.org/10.1016/j.conbuildmat.2025.141084.