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Ronghui Yan worked as a visiting researcher in the University of Idaho. She is now an associate professor of Suzhou City University. Her research interests focus on infrastructure health monitoring for transportation, signal processing and pattern recognition.
Outline
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.
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.
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.
The findings of this paper were significant for the quality control of HRGA compaction.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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