Simulation Study On The Compaction Process Of Large Size Stone Under The Action Of Vibration Compaction Machine

In road construction,roadbed filling materials generally according to local conditions.Mountains and more stone,so the rock-filled roadbed has become one of the basic forms of structure commonly used in mountain roadbed.In the compaction process of the rockfill roadbed,the quality of the compaction effect is related to the type of compaction machinery and filler.Simulation analysis of the compaction process can be carried out for the largediameter stone filled roadbed in the compaction process of construction parameter optimization and construction equipment selection.This paper analyzes the compaction process and establishes a discrete element simulation model of the large-size rockfill roadbed and different vibration compaction mechanical working devices simulation model.The coupled simulation of the large-diameter rockfill roadbed model and the vibratory compaction machinery working device model is used to study the largediameter rockfill roadbed under the action of vibratory compaction machinery.The analytical results show that the coupled model can effectively simulate the changes in roadbed settling rate and porosity during compaction.In this paper,a vibratory working device model including different vibration parameters,vibratory wheel shape and vibration type is established,and coupled with the established roadbed model for simulation.First,the effect of vibration operating parameters related to the excitation force on compaction effect and crushing is analyzed.For the same tonnage,a larger vibration frequency does not improve the compaction effect and crushing rate.In this paper,the inherent frequency of sandstone pavement should be between 29 Hz and 32 Hz,and the vibration frequency is more effective in this range.The improvement of the tonnage has a more obvious effect on the compaction effect and the crushing rate.The improvement of the compaction effect is limited only by the increase of vibration amplitude,which must be reasonably matched with the vibration frequency to have more obvious improvement.Afterwards,the compaction and crushing results of circumferential vibration,bump vibration and vertical vibration compaction machines were compared.Vertical vibration under the pavement compaction efficiency is better,the settlement rate decreases the most,the porosity decreases faster,and the crushing rate is the largest;bump vibration Good compaction performance in the early stage,relatively insensitive to changes in vibration frequency,which can accelerate the imbalance of the upper structure of the pavement;in the entire compaction During the process,the compaction effect of the pavement layer under circular vibration is more balanced,and the crushing rate is the lowest.Finally,the change of particle movement state was analyzed,and it was concluded that the main mode of particle movement in compaction was flat movement.