Mechanical Response Characteristics Of Low Embankment And Influence Analysis On Surrounding Structures Under The Action Of Vibration Rolling

Vibratory rolling is an important technical method in embankment construction,however,the interaction mechanism between vibratory rolling machinery and embankment fill is still not well established,while the assessment of the impact of vibratory rolling construction on the surrounding low-rise structures of rural roads needs to be given more attention.Based on the above considerations,an integrated approach combining indoor model tests,numerical simulations and theoretical derivations was adopted to investigate the above key technical issues.Small-scale indoor model tests and scanning electron microscope tests were carried out to reveal the interaction mechanism between vibratory rolling and embankment filling from both macro and detailed perspectives.Different wheel weights and number of compaction passes were taken as the key factors,and the settlement of embankment soil and vibration acceleration values were used as the evaluation indicators of compaction effect.The test shows that: the quality of the vibrating wheel has a significant effect on the compaction effect,while the number of passes is only obvious in the first few passes;the amplitude of vibration acceleration is closely related to the compaction degree of the soil,with the compaction degree increasing the vibration acceleration shows an increase first and then a gentle change law;during the vibration compaction process,the soil pore space evolves continuously,which is characterised by the conversion of the proportion between large and small pore space,and when the number of passes is higher,the soil body will produce new small The pore space of the soil is constantly evolving.A three-dimensional numerical calculation model of the embankment vibratory rolling process was constructed with the aid of ABAQUS finite element software to compensate for the inadequacy of the indoor model test;the vertical displacement and compressive stress distribution of the embankment fill were calculated using the driving speed,number of passes and compaction wheel mass as working variables.The calculation results show that:the decay rate of the vibratory rolling stress is decreasing with the burial depth,and has a certain effective compaction range;wheel weight and number of compaction passes have a greater influence on the compaction effect,while the relative influence of driving speed is not significant.The model of vibrating wheel-fill mechanics and the kinetic characterisation equations are obtained through theoretical derivation,and the relationship between the stiffness and damping of the embankment fill and the force of the vibrating roller on the soil is established.The evaluation model and the ranking of the influencing factors are analysed using numerical simulations,expert scoring and hierarchical analysis to investigate the adverse effects of vibration induced by vibratory rolling loads on low brick structures in rural areas.The results show that the impact factors are,in order of magnitude,vehicle weight,total height of the building,existing damage to the building,distance of the building from the road,number of vibratory crushing loads,vehicle speed and type of foundation soil.