Experimental Study on Spatio-temporal Distribution of Excess-infiltration Behavior of Permeable Asphalt Pavement
In order to explore the actual excess-infiltration behavior of permeable asphalt pavement under different rainfall intensities,and to make up for the deficiency of the existing infiltration test to characterize the drainage capacity,the permeable asphalt concrete with nominal maximum particle size of 13.2 mm(PAC-13)is taken as the study object.Based on the self-developed rainfall drainage test device,the indoor rainfall test and data analysis are carried out on PAC-13 with target void ratio of 20%and 22%by using Chicago rain pattern in Guangzhou with rainfall peak ratio of 0.4 and rainfall duration of 30 min.The spatio-temporal distribution of excess-infiltration behavior of porous asphalt pavement with synthetic slope of 2.5%under rainfall intensity with return periods of 0.5,1,2,10,50,100 a is investigated.It is proposed to comprehensively evaluate the drainage performance of permeable asphalt pavement with the parameters of excess-infiltration water level curve,runoff time parameter and ultimate rainfall intensity.The result shows that(1)the self-developed rainfall drainage device can obtain the spatio-temporal distribution rule of the excess-infiltration behavior of the permeable asphalt pavement;(2)the ultimate rainfall intensity of 20%and 22%porosity test groups are 1.6 mm/min and 2.0 mm/min respectively,the maximum runoff of the test appears in the peak rainfall stage,and the location is generally between 0.7 m and 1.5 m from the center line of the road;(3)increasing the porosity can reduce the size of runoff to a certain extent;(4)the more smooth-out the excess-infiltration water level curve is,the smoother the surface seepage is,and the better the drainage capacity is;(5)the more concentrated the excess-infiltration water level curve is,the closer the drainage capacity is to the limit;(6)increasing the void ratio of porous asphalt pavement has limited influence on the water level height of road surface runoff,but has a good reduction effect on the duration of road surface runoff.The greater the return period,the stronger the reduction effect.At the same time,it can reduce the rate at which the runoff duration increases with the increase of the return period.
road engineeringspatio-temporal distribution of excess-infiltrationrainfall experimentpermeable asphalt pavementdrainage performance
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