Research On Dynamic Response Of Road Surface And Database Evaluation System Under Impact Load

The increasingly sound transportation network provides convenient conditions for all walks of life,and also provides convenient access conditions for national security.For roads,the main load is the car load during daily use.In addition,the road will also be subjected to special impact loads,which often reach dozens of times the design load.Therefore,it is necessary to study the dynamic response of the road surface when the impact load acts on the road to ensure the normal use of some special equipment on the road.The main contents of this thesis are as follows:(1)A comprehensive survey of the traffic road network of Meizhou City and the statistics of the road structure are made.Finally,the typical pavement structure of Meizhou City is obtained.According to the particularity of the impact load,the weight of the test index for the impact load is proposed.(2)Selecting the typical pavement structure of Meizhou City,using the finite element simulation software Abaqus to study the variation law of pavement deformation under impact load;(3)According to the full-scale loading test of three-dimensional test trough,the data obtained by setting the sensor on the impact load and The relationship between the road surface deflection and the FWD load is studied.(4)According to the response law of the road under the impact load and the relationship between the deflection,the road load capacity evaluation criterion and the road damage standard under the impact load are proposed.(5)Based on Baidu map The API and the proposed evaluation criteria use the JAVA programming language to develop a road carrying capacity database management system.Through the above research,this paper obtains the typical pavement structure of Meizhou City and the weighting criteria of the detection index based on impact load.The variation law of the maximum deformation,permanent deformation and springback deformation of the road surface and the deformation of the road surface are established under the condition of modulus attenuation.The relationship model between modulus and modulus;based on the results of three-dimensional test slot test and pavement failure state,the correlation between the drop-type deflection device and the deflection under impact load is established;the evaluation criteria of road bearing capacity under impact load are proposed.Based on this,a road carrying capacity evaluation system was developed.