Numerical Analysis On The Nearby Building Vibrations Induced By Roller

In the process of road construction,the vibratory compaction machine is used for vibratory compaction,which causes forced vibration of adjacent houses,and even civil conflicts caused by oblique cracking are common,and the research and quantitative analysis of such problems in the engineering field are rare.Therefore,from the "vibration source-earth vibration propagation-vibration response of adjacent buildings" full vibration transmission system,the vibratory compaction operation mechanism of vibration roller,the transmission law of vibration wave and the vibration response characteristics of adjacent brick and concrete buildings are deeply studied.Provide reference and basis for guiding road construction,scientific assessment and identification of the safety of vibration-damaged houses.The main research contents and results are as follows:(1)Through the analysis and research on the compaction mechanism of vibratory roller,the dynamic model of "vibrating roller-loose sand filler-compacting subgrade" was established,and the numerical simulation of MATLAB/SIMULINK software was used to obtain the vibratory roller.The vibration load transmitted to the compacted roadbed after the compacting and energy consumption of the loose-sand filler.(2)The finite element model of "subgrade-semi-infinite elastic foundation" is established.The forced vibration of semi-infinite elastic foundation under vibration loading is studied.The propagation and attenuation of vibration waves in different foundation soils are obtained.(3)Taking the ground floor widely used in China's township streets as the facade,the second floor with two-story brick-concrete structure for canopy for living,the finite element model of the house was established,and the constitutive relationship of the model house materials was carried out.Based on the comprehensive mechanical discussion,based on the similar mechanical properties and failure characteristics of brick and concrete,the concrete damage plasticity model of the software is selected as the constitutive model of the brick-concrete structure house material,and the model material parameters are reasonably set.(4)Calculate the vibration response of the model house when the working position of the roller is located at the front and side working distances of the model house respectively of 2 meters,3 meters,...,6 meters.The tensile damage cloud map,the average tensile damage parameters and the interlayer elastic-plastic displacement angle of the model house wall are obtained.The calculation results show that for the powder foundation,the damage of the wall of the house begins at the stress concentration of the door and window opening and the corner of the wall and develops rapidly.After the maximum time of about 1.2 seconds,the damage tends to be stable;when the vibratory roller is located on the side of the house When the construction safety distance is about 6 meters,when the vibratory roller is located on the front of the house,the construction safety distance is about 5 meters.