Study on the optimal test parameters for vibration compaction based on the control of physical-mechanical indicators
Year: 2025
Type: article
Abstract: Purpose The indoor vibration compaction test (IVCT) was a key step in controlling the compaction quality for high-speed railway graded aggregate (HRGA), which currently had a research gap on the assessment indicators and compaction parameters. Design/methodology/approach To address these issues, a novel multi-indicator IVCT method was proposed, including physical indicator dry density (ρd) and mechanical indicators dynamic stiffness (Krb) and bearing capacity coefficient (K20). Then, a series of IVCTs on HRGA under different compaction parameters were conducted with an improved vibration compactor, which could monitor the physical-mechanical indicators in real-time. Finally, the optimal vibration compaction parameters, including the moisture content (ω), the diameter-to-maximum particle size ratio (Rd), the thickness-to-maximum particle size ratio (Rh), the vibration frequency (f), the vibration mass (Mc) and the eccentric distance (re), were determined based on the evolution characteristics for the physical-mechanical indicators during compaction. Findings All results indicated that the ρd gradually increased and then stabilized, and the Krb initially increased and then decreased. Moreover, the inflection time of the Krb was present as the optimal compaction time (Tlp) during compaction. Additionally, optimal compaction was achieved when ω was the water-holding content after mud pumping, Rd was 3.4, Rh was 3.5, f was the resonance frequency, and the ratio between the excitation force and the Mc was 1.8. Originality/value The findings of this paper were significant for the quality control of HRGA compaction.
Source: Railway Sciences
Authors: Zhongrui Chen, Yanxi Xiong, Ronghui Yan, Zhibo Cheng, Taifeng Li, Hongfu Tan
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4411457604