Research On The Realization Of Sponge City Concept And Permeable Pavement Performance

With the acceleration of urbanization in China,China's economy has developed rapidly.However,in recent years,the ecological environment problems caused by urban rainwater runoff have affected the normal operation of the city.Rainwater,as one of the important water sources in the city,can be treated by scientific methods,which can not only solve the current urban rainwater runoff problem but also transform it into available resources,and also provide an important way to solve the problem of water shortage.Based on this background,China put forward the great idea of building sponge city.The research focus of urban rainwater resource recovery is still in the large-scale water conservancy planning,and there are few studies on how to make the sponge body of small modules fully combine and give full play to the regulation role of buildings in the city on rainwater.Permeable pavement is a measure to directly control rainwater from the source in the sponge city theory.This study uses the pervious pavement in low-impact development measures as the main technology to construct a conceptual sports field.Drainage method,make full use of rainwater,realize rainwater resource utilization,and guide the design principles of similar public buildings.This research focuses on the raw materials of drainage asphalt mixture(PAC-13)and modified asphalt mixture(SUP-25).Three test gradations were selected for each,and they passed the leak test,scattering test,and rotary compaction test.The analysis determined the optimal amount of asphalt.Performance tests were performed on the drainage asphalt mixture(PAC-13)and modified asphalt mixture(SUP-25),such as high temperature stability,water stability,and freeze-thaw split strength.The test results show that the materials selected in this study Reasonable and reliable,good grading.The two asphalt mixtures meet the requirements in terms of ensuring the water permeability and bearing capacity of the constructed sponge-type sports field.At the same time,the water-permeability mechanism of the drainage asphalt mixture and the permeability coefficients of each zone in the sponge-type sports field are analyzed.Based on the SWMM storm and flood management model,the sub-catchment division,parameter selection,and rainfall data are selected for the sports field in the study area to construct two hydrological models of sponge sports field and traditional sports field.Comparing the runoff of the two models,the results show that the sports field constructed by the permeable pavement technology in the sponge city theory has significant effects in reducing flood peak flow,shortening peaktime,and increasing rainwater infiltration in the sports field.