Research On Causes And Treatment Technology Of Pavement Destruction Around Road Inspection Well

As China’s economy soars,traffic becomes increasingly busy and congested,and urban road construction has developed rapidly.However,as the inspection well for repairing the underground "large artery" in the city,it is often neglected,and the destruction of asphalt concrete pavement around the inspection well has become a common problem in the city.Cracks,depressions,and settlements often appear on the asphalt concrete pavement around the inspection well,which not only affects the beauty of the city,but also brings an uncomfortable experience to passing vehicles.The service life of the inspection well and the surrounding asphalt pavement has been greatly shortened.Therefore,dealing with the destruction of the road surface around the inspection well has become an urgent problem.In order to analyze the causes of pavement damage around the inspection wells and fundamentally solve the criticisms on the side of the wells,this paper will classify the current status of pavement damage around the inspection wells,and study the damage composition of different types combined with finite elements.1.Field investigation,statistics,and analysis of the damage situation of the road surface around the inspection well,the main types of damage and the frequency from high to bottom are: cracks around the well surface,road surface settlement around the well,and inspection well depression;causes of damage to the road surface around the well According to preliminary analysis,the failure of the mortar cushion under the well circle is the main reason for the depression of the inspection well;there is a large difference in rigidity between the inspection well and the surrounding asphalt concrete pavement,and the effective compaction of the backfill soil during construction is caused by the periphery of the inspection well.The main reason for asphalt concrete pavement subsidence;the height difference between the inspection well and the road surface and the coupling effect of dynamic and static vehicle loads under repeated action are the main reasons for the cracks around the inspection well.2.Adopt ABAQUS finite element software to simulate the three-dimensional solid structure of the inspection well and the surrounding asphalt concrete pavement,and analyze the stress and deformation of the corresponding components under the load of the vehicle under different conditions.For the dynamic load of the vehicle,the actual wheel trajectory is used and the three-dimensional truck is finite element analysis.The dynamic load analysis of asphalt concrete around the inspection well found that: the vehicle dynamic load is the main reason for the roadside damage around the inspection well;the dynamic load impact coefficient is positively correlated with the speed and height difference;the mortar layer and the backfill around the well are weak links.It is easy to induce damage to the road surface around the well.3.From the aspects of design,construction,and optimization,discuss measures to prevent damage to the road surface.For traditional inspection wells,the design should strengthen the restriction on the well circle;increase the strength of the mortar cushion;use high-strength materials such as fluid fly ash Wait for the backfilling of the well periphery;standardize the construction process and process.Introducing bridgehead slabs to optimize traditional inspection wells,slabs can effectively transition uneven settlement between inspection wells and pavement due to height difference,improve pavement stress and strain,and have good engineering application for repairing damaged pavement surrounding well prospect...