| In recent years,the rapid development of urbanization and climate change have caused serious rainstorm waterlogging disasters and urban water environment pollution.Based on this,General Secretary Xi Jinping proposed the idea of building a "sponge city" with natural accumulation,natural infiltration and natural purification at the Central Urbanization Work Conference in December 2013.At present,with the rapid development and expansion of the city and the continuous improvement of supporting infrastructure construction,the hardened road area has accounted for 15-20% of the urban construction land area.Traditional road design under the premise of satisfying the road function,the drainage design idea is mostly "drainage-oriented,lagging utilization",ignoring the protection of the ecological environment,which leads to high pressure on road drainage,difficulty in effective control of runoff pollution,and serious waste of rainwater resources.Under the new situation of advocating "sponge city" design,traditional road design concepts cannot meet the road’s index requirements for rainwater runoff control and rainwater pollutant control.It is urgent to seek new methods and new ideas for road engineering design based on sponge design concepts,analyze and study the impact of various low-impact development engineering measures on stormwater runoff control and stormwater pollutant control.Firstly,the difference between sponge city road engineering design and traditional road engineering design is compared and analyzed from the three aspects of design goals,design concepts and road layout,combined with a detailed introduction of the research status of sponge city road engineering at home and abroad,the research method and technical route of this article are put forward,and it is clear that the construction of sponge city road engineering is of great significance for reducing the pressure on the municipal rainwater pipe network,reducing the risk of urban waterlogging,and improving the water quality of the urban water system.Secondly,analyze the actual construction needs of sponge city roads in different regions and construction conditions,and carry out specific analysis based on the project location,road grade,regional climate,hydrological conditions,local supervision policies,drainage and waterlogging prevention planning and other factors affecting sponge city road construction,and based on this,combed out the sponge city road system planning and design system,revealing the importance of a perfect sponge city road system planning and design system to promote the development of sponge road projects.Thirdly,in view of the specific technical measures of sponge city road engineering,the selection principles of different road types of sponge technical measures are discussed,and how to combine the actual situation of the project in the design process of sponge city road engineering,select reasonable means to achieve the sponge design goals,Combined with the case of the completed sponge city road project,comprehensive analysis is made from the aspects of alleviating urban waterlogging,improving water quality,replenishing groundwater resources and mitigating urban heat island effect,and evaluating the environmental benefits and durability of the sponge city road construction project.The practical significance and role of sponge city road engineering construction.Finally,combined with the specific case of the sponge city design of Quanrun Avenue in the Sponge City Construction Demonstration Zone of Xuzhou City,the design content of the sponge road project is analyzed,such as the division of catchment areas,overall plan layout,runoff control process summary,partition calculation,and indicators Check and design of facility nodes,etc.,summarize the specific steps and design methods of sponge city road engineering project design,in order to provide reference for the same type of sponge road engineering design.The research results of this paper can be used for reference to the design of sponge city roads in the future. |
