Study on standardization method and application of vibration compaction test parameters of high-speed railway subgrade filler
XIE Kang1，CHEN Xiaobin1，YAO Junkai2，CAI Degou2
(1. School of Civil Engineering，Central South University，Changsha，Hunan 410075，China；
2. Railway Engineering Research Institute，China Academy of Railway Sciences Co.，Ltd.，Beijing 100081，China)
Abstract：As a method to determine the maximum dry density of coarse-grained soil filler on high-speed railway subgrade，vibration compaction test lacked the standardized research on test parameters. In order to put forward the vibration compaction standard and test method of high-speed railway coarse-grained soil filler，the vibration compaction test was carried out by self-developed large intelligent vibration compaction instrument. The influence of test parameters(water content，size and vibration parameters) on dry density was further analyzed，the standardization mechanism of vibration compaction test parameters was revealed，and the determination method of vibration compaction test parameters under resonance was further proposed. Finally，the rationality of the method was verified according to the field rolling compaction test. The research results show that：(1) With the increase of water content，the dry density of vibration compaction method decreases first and then increases. However，when the water content is too high，the phenomenon of "mud pumping" appears in the vibration compaction test. With the critical water content after drying，there is no phenomenon of "mud pumping " in the compaction，and the dry density meets the on-site rolling compaction standards.(2) Taking 3.9 as the diameter-diameter ratio(the ratio of the inner diameter of the compaction cylinder to the maximum particle size of the filler ) and 3.5 as the thickness-diameter ratio(the ratio of the paving thickness to the maximum particle size of the filler ) of the vibration compaction test can eliminate the influence of the boundary size effect of the compaction cylinder on the dry density. (3) The mathematical model of the relationship between filler gradation and natural frequency is established. In the test，the vibration frequency is set as the natural frequency of filler，and the vibratory quality is set as 600 kg. Moreover，when the ratio of excitation force to vibratory quality is controlled to 1.8 by adjusting the eccentricity，the maximum dry density of filler can meet the compaction standard of high-speed railway subgrade. The research results can be used to popularize the vibration compaction method，and also help to deepen the understanding of the mechanism of vibration compaction.
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2023, Vol. 42 
