| The full hydraulic single drum vibratory roller has become the most common operation equipment in pavement compaction equipment.At present,the full hydraulic single drum vibratory roller in the domestic market is mainly divided into two types: full hydraulic vertical vibratory roller and full hydraulic circumferential vibratory roller.Taking the full-hydraulic circular vibrating roller as the research object,this paper studies the dynamic characteristics of the compaction process and the influence of the rotation direction of the vibration axis on the compaction effect by means of theoretical analysis,experimental study and numerical simulation.Firstly,on the basis of soil triaxial compression test and combined with the previous research results,a nonlinear dynamic model of 4 degrees of freedom of full hydraulic single steel wheel vibrating roller is established by using segmented linearization method,and the velocity and acceleration of vibration wheel and frame vertical and horizontal direction of vibration compaction process are analyzed.The differences between the analysis results of the nonlinear model and the linear model are also discussed.The vibration performance parameters of the test prototype and the compaction soil stress data were obtained by using a certain type of test prototype for vibration performance test and soil compaction operation test.The consistency of the direction amplitude of the axis of the vibrating wheel is analyzed.On the basis of the experiment,the finite element simulation model of the compaction process of the full-hydraulic single steel wheel circumference vibration roller is established with the help of ABAQUS software,and the simulation results are consistent with the experimental results,which verifies the correctness of the finite element simulation model.Finally,the simulation model is used to analyze the stress distribution in the compacted soil and the influence law of the rotation direction of the vibrating shaft wheel on the compaction effect.The simulation results show that the internal stress of the soil is decreasing along the depth direction under the static pressure condition and under the vibration compaction condition,and evenly distributed along the axis direction of the vibration wheel.The stress in the cross section of the vibration wheel in the static pressure condition is approximately distributed symmetrically along the vertical direction,and under the vibration condition,the vibration wheel and the rotating direction of the vibrating shaft remain opposite,which can make more compressive stress act in the soil of the compacted region,and bring better compaction effect. |
PDF Full Text Request