Research On The Application Of Municipal Road Engineering Under The Sponge City Theory

With the rapid development of urban construction,the scope of cities continues to expand,and the number of municipal roads continues to increase,resulting in changes in the ecological environment,leading to increasingly serious problems of urban waterlogging and stormwater flood control and utilization.In the traditional municipal road construction planning and design scheme,urban rainwater is mainly discharged through the municipal pipe network.This concept has been unable to meet the rapid development of municipal road construction.Therefore,China proposes the concept of "sponge city",focusing on the construction of sponge cities,applying low-impact development(LID)facilities to the construction of municipal roads,so that the city can be like a sponge,"elastic",so that municipal roads have water storage and resistance The ability of waterlogging enriches the street landscape.This article takes the Kunming street road project in Changchun as an example,and studies the application of municipal road engineering based on the sponge city theory.The main research contents of this article are as follows:First,the sponge city and low-impact development theory are analyzed.By drawing on typical cases at home and abroad,combined with the case of Kunming Street Road,permeable pavement and sunken green spaces are used for sidewalks,non-motorized vehicle lanes and green belts within the red line of municipal roads.Wait for the design of low-impact development facilities,and calculate the construction scale of low-impact development facilities in Kunming Street Road;then use SWMM model software to build a road model under the three modes of primitive ecology,traditional development and sponge city development,and simulate 50 The surface runoff of rainwater during the recurrence of annual heavy rains.By comparing and analyzing the surface runoff curves under the three modes,it shows that the LID facility has a certain reduction effect on surface runoff and can store part of the rainwater resources to meet the needs of the sponge city concept.Effectively control the probability of urban waterlogging;Finally,according to the quality and technical indicators of PAC-20 type permeable asphalt concrete mineral mixture,the mix ratio design is carried out to determine the optimal oil-rock ratio of 3.1%,and then use the Marshall test and freeze-thaw split test To verify the road performance of water-permeable asphalt used in non-motor vehicle lanes,the test shows that the designed water-permeable asphalt concrete has good water permeability and meets its road performance and meets the needs of sponge cities.