Study On Seepage Simulation Of Pavement Structure In Sponge City

With the rapid urbanization of China,various provinces and cities are measured by the urbanization construction level if developed city.While enhancing people's quality of life,natural systems is damaged and occupied by human also approaching a certain limits.Urban natural systems can't rely on their ability to restore.Nature properties is weakening are common problems of the current urban environment,which can cause the urban water resources shortage and seriously damage.Sponge city is the new concept for urban flooding disasters,can gradually improve the serious pollution of water environment and improve the utilization of water resources.Under low-impact development strategy,you need to solve the first problem that is the impermeable payment construction and hard-road,concrete pavement is airtight just like to stick a layer of tape on the urban surface so that can't breathe,and sponge city's main concept is refers to under the natural conditions,through natural means,rain infiltrate into groundwater or natural collecting basin,then the rain processing as domestic water,make the urban environment has a elastic ability to self-restore in development.The core content of this article:(1)On the basis of the existing permeable concrete research,reference permeable concrete section characteristics and particle size to establish sponge city's the finite element geometric model of permeable pavement,and on this basis,reference to the indoor experiment and the actual permeable pavement structure configuration,set up permeable brick,permeable concrete pavement typical,atypical models of concrete pavement,the pavement concrete pavement,and permeable brick pavement seepage model,also gives the analyses to the result.(2)On the basis of the established finite element seepage model,for permeable pavement type(permeable brick pavement,typical and atypical concrete pavement,pedestrians' road),particle size and other factors that affect the waterproof effect analysis,the following main conclusions are drawn: under the condition of the same ratio of aggregate particle size,the permeability of porous concrete is superior to the permeability of permeable brick,and in the same boundary conditions,the particle size,the greater the average speed of fluid is,the greater the permeable concrete particle size between 5 mm and 15 mm there is a more appropriate point,satisfy the waterproof effect,at the same time guarantee the porosity of material not too big,make it has enough mechanical strength.(3)According to different rainfall intensity,the permeable pavement are analyzed and calculated by the corresponding precipitation border,to simulate the different precipitation conditions of permeable pavement seepage process and waterproof effect.On the basis of the finite element model is analyzed under the condition of same rainfall of waterproof concrete and common waterproof effect of permeable brick on the market,get the following conclusion: the typical permeable concrete pavement for moderate rain and heavy rain conditions with good effect,sponge sponge city demand.Under the heavy rain rain conditions,typical of permeable concrete pavement has a more general effect,sponge are difficult to meet the demand of sponge city.Rain in the heavy rain and rainstorm cases,typical permeable concrete pavement conditions of heavy rain and rainstorm rain basic does not have a sponge effect,don't meet the demand of sponge city.