岩土工程学报2024，Vol.46Issue(4)：803-813,11.DOI:10.11779/CJGE20230030
基于粗颗粒动态演化过程的高铁填料振动压实机理研究
Vibration compaction mechanism of high-speed railway fillers based on dynamic evolution of coarse particles
摘要
Abstract
In order to reveal the mechanism of vibration compaction for high-speed railway fillers,a series of typical graded gravel fillers which belong to the surface layer of the subgrade are used to the investigation object.Firstly,an evaluation system for the compaction quality assessment indices of continuous dry density ρ rd,dynamic stiffness K rb and modified foundation coefficient K 20 is established based on the self-developed vibration compaction apparatus.Secondly,the graded gravel was scanned by X-CT during the vibratory compaction.The compaction mechanism of graded gravel was revelad based on the the dynamic evolution of coarse particles.The results show that ρ rd of the graded gravel fillers exhibits a rapid rise-slow rise tendency.However,K rb and K20 present a rapid rise-slow downward tendency.Moreover,the compaction locking point T lp is proposed to quantify the inflection point of graded gravel fillers during the vibration compaction.During the vibration compaction process,the stability of vibration compaction occurs when 60%of the coarse particles tend to be horizontally arranged in the long axis(Tlp state).And then further compaction results in the occurrence of surface grinding-based crushing phenomenon of coarse particles to destroy the skeleton stability.Finally,the validity of the mechanism is verified through the discrete element simulation.The research results can reveal the vibration compaction mechanism from the fine view level and provide a new method for the intelligent rolling quality assessment of high-speed railways.关键词
高铁路基/级配碎石/压实机理/X-CT/动态演化/量化表征Key words
high-speed railway subgrade/graded gravel/compaction mechanism/X-CT/dynamic evolution/quantitative characteristic分类
建筑与水利引用本文复制引用
谢康,陈晓斌,尧俊凯,李泰灃,王业顺,邓志兴,吕鑫龙..基于粗颗粒动态演化过程的高铁填料振动压实机理研究[J].岩土工程学报,2024,46(4):803-813,11.基金项目
国家自然科学基金项目(51978674) （51978674）
中国国家铁路集团有限公司科技研究开发计划项目(P2021G053) （P2021G053）
中国铁道科学研究院集团有限公司基金项目(2021YJ071) （2021YJ071）
中南大学研究生创业计划项目(2022ZZTS0622) （2022ZZTS0622）
