Study on standardization method and application of vibration compaction test parameters of high-speed railway subgrade filler

被引：0
|
作者：
Xie K. [1 ]
Chen X. [1 ]
Yao J. [2 ]
Cai D. [2 ]
机构：
[1] School of Civil Engineering, Central South University, Hunan, Changsha
[2] Railway Engineering Research Institute, China Academy of Railway Sciences Co.，Ltd., Beijing
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷 / 07期
基金：
中国国家自然科学基金;
关键词：
compaction standards; high-speed railway subgrade; moisture content; size effect; soil mechanics; vibration compaction; vibration parameters;
D O I：
10.13722/j.cnki.jrme.2022.0945
中图分类号：
学科分类号：
摘要：
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 Rd to the maximum particle size of the filler dmax ) and 3.5 as the thickness-diameter ratio(the ratio of the paving thickness h0 to the maximum particle size of the filler dmax ) 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. © 2023 Academia Sinica. All rights reserved.
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页码：1799 / 1810
页数：11
相关论文
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