Experimental Study On The Permeability Test And Maintenance Method Of Permeable Material In Sponge City

In the construction of sponge cities,permeable materials are widely used.Us ing permeable materials to pave the pavement can make the rainwater of the road seep quickly and reduce the hidden danger of urban waterlogging and reduce noise and adjust temperature,which will realize the "natural accumulation,natural penetration,and natural purification of urban rainwater".It is of great significance to play the role of sponge city.However,in the working environment,the permeable material has the problem of being clogged by sediment,which causes the permeable function to decrease or even disappear.Therefore,it is necessary to conduct regular permeability measurement and cleaning.In this paper,researches on field permeability measurement,clogging mechanism and cleaning methods of permeable materials are carried out.The main work is as follows:First,in view of the characteristics of the permeable pavement structure and the defects of the conventional infiltrometer,a new type of double-ring infiltrometer that can realize the simultaneous infiltration of water in the inner and outer rings was developed.On the basis of verifying the principle of the new double-ring infiltrometer and calculation method of permeability coefficient by using numerical simulation,the effectiveness of the double-ring infiltrometer is proved by field permeability measurement,and applied for the invention patent.Then,on the basis of analyzing the source o f clogging particles of permeable pavement,taking soil from different "sponge cities" pilot areas to conduct indoor simulation clogging tests on currently widely used permeable materials,and study the permeability and clogging laws of permeable materials under the clogging of soil particles of different properties.Combining the clogging test phenomenon and the clogging theory,the relationship between the particle types and the clogging mode is determined,and the site selection of the permeable material s is proposed.Finally,the influencing factors of different clogging modes were analyzed,and seven cleaning methods were carried out to find out the law of permeability recovery of permeable materials and the best cleaning method under different clogging modes.