Numerical Analysis Of Anti-skid And Noise-reducing Asphalt Pavement Structure

The anti-skid and noise-reduced asphalt pavement completed in the actual construction process has the special basic characteristics of large porosity,and has ideal functions of anti-skid,drainage and noise reduction.During the analysis of the thesis,based on the specific project of the 1km test section of Changsha S103(Liuyang section),with the help of the optimized overload load diagram,combined with the common damage mode of asphalt pavement,the anti-slip noise reduction asphalt was established by ABAQUS finite element software Finite element model of road surface under static load and vehicle-water coupling,analysis of stress and strain changes of pavement structure under different loads and saturated pore water pressure under different loads,different driving speeds and different void ratios under vehicle-water coupling Change;and comparatively analyze the mechanical properties of the anti-slip noise-reducing asphalt pavement structure and the ordinary dense graded asphalt pavement structure.The results show that:1.The anti-skid and noise-reducing asphalt pavement structure does not affect its load-bearing capacity and pavement performance while satisfying the road drainage;by gradually increasing the axial load,the tensile stress and strain at the bottom of the asphalt surface layer,the shear stress at the bottom of the surface layer,Road surface deflection,compressive strain at the top of the soil foundation and top compressive stress of the asphalt pavement layer are gradually increasing,excessive load is easy to cause damage to the pavement structure,affecting the performance of the road;increasing the thickness of the asphalt surface layer can effectively reduce the road road Surface deflection and compressive strain at the top of the soil foundation,improve the road bearing capacity,reduce the possibility of rutting;the compression of the asphalt surface mainly occurs in the area closer to the road surface,the greater the depth of the road surface,the compression of the asphalt surface The smaller the amount;increasing the base layer and soil base modulus can play a role in improving the carrying capacity of the road and reducing the damage of heavy-duty vehicles to the pavement,but after the modulus is too large,the performance of the pavement is not obvious.Consider comprehensively with economic aspects to determine the best structural combination;the compression deformation of the asphalt surface layer is not greatly affected by the type of structural layer and the modulus of the subbase and soil foundation.2.The effect of saturated water anti-slip noise-reducing asphalt pavement pore water pressure on the surface layer is especially obvious.With the continuous increase of the depth of the pavement structure,the pore water pressure continues to decrease;the saturated asphalt pavement is under the coupling effect of water and driving load The water in the void generates a large pore water pressure.Under the combined influence of excessive pressure,such as scouring,squeezing and suction,under the repeated influence of multiple forces such as driving load,the nearby asphalt mortar and The cohesiveness of the aggregates faces a significant destructive effect,which also makes the aggregates increasingly peeling,the voidage in the pavement structure continues to increase,and the final structural strength also decreases significantly.And it caused the problem of water damage;compared with the ordinary dense graded asphalt pavement structure,the anti-skid noise reduction asphalt pavement structure was significantly reduced by the effect of the load effect of displacement and stress.