土石混合体碾压效果研究  

Study on Compaction Effect of Soil-Rock Mixture

作　　者：刘润[1] 韩林浩 孙若晗 Liu Run;Han Linhao;Sun Ruohan(State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University;Institute of Marine Energy and Intelligent Construction,Tianjin University of Technology)

机构地区：[1]天津大学水利工程智能建设与运维全国重点实验室,天津市300350 [2]天津理工大学海洋能源与智能建设研究院,天津市300393

出　　处：《勘察科学技术》2025年第1期1-8,74,共9页Site Investigation Science and Technology

摘　　要：土石混合体是常见的山区公路填筑材料,确定最优的土石混合体碾压方式是路基质量的重要保障。该文基于室内大型三轴剪切试验结果,结合颗粒流软件构建土石混合体离散元模型,提出最小孔隙率相等原则下的缩尺碾轮等效荷载确定方法,采用数值模拟并结合现场试验结果分析碾压过程中颗粒的运动规律及压实机理。研究结果表明:土石混合体的铺设厚度与沉降率非正相关,现场土石混合体在振动碾压遍数6~8遍、铺设厚度为50 cm时压实效果最佳。离散元模拟为土石混合体碾压过程中宏观参数的变化规律提供了可视化分析途径,为确定现场碾压施工参数提供依据。Soil-rock mixture is a common fill material for mountainous highways,and determining the optimal soil-rock mixture rolling method is an important guarantee for the quality of the roadbed.Based on the indoor large-scale triaxial shear test results,combined with particle flow software,a discrete element model of soil-rock mixture is constructed.A method for determining the equivalent load of a scaled roller under the principle of equal minimum porosity is proposed,and numerical simulation and on-site test results are used to analyze the movement law and compaction mechanism of particles during compaction.The research results indicate that there is a non-positive correlation between the laying thickness and settlement rate of soil rock mixtures.The best compaction effect of on-site soil rock mixtures is achieved when the vibration compaction passes 6-8 times and the laying thickness is 50 cm.Discrete element simulation provides a visual analysis approach for the changes in macroscopic parameters during the compaction process of soil rock mixtures,and provides a basis for determining on-site compaction construction parameters.

关 键 词：大型三轴试验 土石混合体 离散元模拟 路基碾压 现场试验 

分 类 号：U416.1[交通运输工程—道路与铁道工程]