Research On Load-bearing And Permeability Of Reinforced Pervious Pavement

In recent years,heavy rain has brought great difficulties and losses to people's life and economy.The waterlogging caused by heavy rain has become a major disaster in the city.Therefore,the state proposes a new urban management system,namely “Sponge City”.Constructing “Sponge City” requires “Sponge Body”.The“Sponge Body” includes not only river,lake,pond and other water systems,but also green space,garden,pervious pavement and other urban supporting facilities.At present,there are many researches on pervious pavement.Pervious concrete pavement is a kind of layered structure,but it can only be used for light pavement because of its low strength.Therefore,in this paper,through the arrangement of geotextile in the structural layer of pervious concrete pavement to improve the bearing capacity of the pavement,but not significantly reduce its permeability.The main research work of this paper is as follows:(1)According to the surface structure of pervious concrete pavement,the pervious concrete test blocks with water cement ratio of 0.27,0.30 and 0.33,single particle size of 5-10 mm,single particle size of 10-15 mm and mixed particle size of5-15 mm are made,and the compression test and penetration test are carried out to analyze the influence law of water cement ratio and bone material particle size on its mechanical properties,and to reveal the linear relationship between compression performance and permeability performance.(2)Through large-scale direct shear test,the interface relationship between different fillers in pavement structure layer is studied.Under the condition of normal stress of 50 k Pa,100 k Pa,150 k Pa and shear velocity of 0.05 mm/s,0.5 mm/s,5 mm/s,the interface characteristics between gravel,sandstone,clay and geotextile are studied.The parameters of interface shear strength,cohesion,friction angle and similar friction coefficient are analyzed to reveal the reinforcement mechanism of geotextile.(3)The numerical calculation models of geotextile reinforced pervious pavement and ordinary pervious pavement are established to simulate and analyze the distribution and evolution laws of seepage pressure and velocity in the structure of ordinary pervious pavement and reinforced pervious pavement under the moderate rain,heavy rain and rainstorm,and to reveal the regular of geotextile reinforced pervious pavement on the permeability performance.(4)Based on the numerical calculation model,the shear stress,vertical stress,horizontal slip and deflection of the pavement structure layer under the action ofdriving load are studied.The bearing performance and mechanical characteristics of geotextile reinforced pervious pavement and ordinary pervious pavement are comprehensively compared and analyzed,and the regular of geotextile reinforced pervious pavement on the improvement of the bearing performance is revealed.There are 57 figures,26 tables and 94 references.