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Permeable asphalt pavement , is a general term for a class of asphalt pavement structure by the mix of larger porosity as the pavement structure layer , allowing water to enter the pavement ( or roadbed ) road surface . The structure of such a large gap so that rainwater penetration of the road , an effective complement to urban groundwater , improving the urban ecological environment ; In addition, to reduce water pollution, reduce road surface runoff , noise reduction and mitigation of urban heat island effect , and many other advantages . The article refers to research at home and abroad on the porous asphalt pavement , and focus on the design of porous asphalt pavement structure . Firstly, the porous asphalt pavement structural design process , including permeable Design and Bearing Capacity , and analyze the impact of permeable design and Bearing Capacity factors to be considered . Secondly, based on Darcy's law , rainwater penetration amount , water and temporary water storage capacity of quantitative formula , combined with research at home and abroad on the permeability coefficient and permeability tests , recommended structural layer coefficient of permeability range penetration test equipment . Then , permeable asphalt pavement structure layer research at home and abroad , summed up the main indicators of the need to control the design permeable surface layer , filter layer , grassroots , cushion , impermeable layer and geotextile . Finally , in the United States on the basis of studies of porous asphalt pavement structure , the combination of the characteristics of the asphalt pavement structure and corresponding regulatory requirements , permeable asphalt pavement structure type classification , and permeable asphalt pavement structure design method . In addition , the applicability of permeable asphalt pavement , including the social and economic benefits analysis and geographic sensitivity .
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