Compaction characteristics of slag subgrade with different rock content
HU Peng
CHI Lianyang
WANG Kun
SHAN Yanyong
SONG Zhichao
DU Hailun
GUAN Qingyong
Abstract：To study the optimal compaction vibration frequency and dynamic response of different stone content in tailings slag,multiple compaction models for tailings roadbed are established using the contact model in the discrete element software EDEM.The vibration frequencies are set at 28,30,34,and 40 Hz,with stone contents of 60％,70％,and 80％.The analysis focuses on particle trajectories,total stress,and velocity variations.The results indicate that:l)The optimal vibration frequencies for tailings slag with stone contents of 60％,70％,and 80％are 34,30,and 40 Hz,respectively.2)The crushing rate increases with the rise of stone content and vibration frequency;for the same stone content,the porosity of the compacted mixtures containing crushable particles is generally lower than that of the mixtures containing non-crushable particles.3)The activity of particles with sizes of 3,30,and 70 mm is 0.098,0.716,and 29.372,respectively;the activity of larger particles(70 mm)is lower,while the activity of medium-sized particles(30 mm)is higher,and the smallest particles(3 mm)have the highest activity.4)During the compaction process,based on the changes in average total stress and average particle velocity,the process is mainly divided into three stages:plastic compaction,working condition transition,and completion of compaction.5)In the plastic compaction stage,the average total stress of tailings particles is low,predominantly undergoing plastic deformation,with small contact forces between the vibration plate and the tailings;during the working condition transition stage,there is a sudden change in contact forces between the vibration plate and tailings,as well as in the average total stress of the particles;in the completion stage,tailings particles underwent primarily elastic deformation,forming a well-structured dense skeleton with a higher average total stress.6)In the plastic compaction stage,the particle velocity is unstable and low,while in the completion stage,a dense skeletal structure is formed,with little variation in the relative positions of large and small particles;large particles carry small particles and vibrate together with the vibration plate,resulting in minor changes in average velocity.7)The phases of average particle velocity and average total stress are consistent,and for the same stone content at the same vibration frequency,the duration of the phases is the same;when the impact frequency approached the inherent frequency of the slag,the particles quickly reach a stable state,resulting in the best compaction effect.
Keywords：slagsubgradediscrete elementcompaction testvibration frequencystone content
Publication Date：2025-03-29
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：10( 43-52 )