Design And Research Of Sunken Road Drainage System Based On Sponge City Concept

The sinking road is an important form of urban road rapid transformation.It has many advantages such as good landscape,saving land,convenient traffic,reducing pollution,blocking noise and so on.At the same time,the problem of sinking road drainage is difficult because of the long longitudinal slope and large water area.Road water damage to the road itself,but also has a great impact on people’s traffic and life.The idea of the sponge city is introduced into the design of the sinking road drainage system,which provides the method and thought for the solution of the drainage problem.First,the paper compares the sinking road with other fast ways,such as main and auxiliary roads,tunnels and viaducts,and introduces the characteristics of the sinking road in detail and leads to the drawback of the drainage difficulty of the sinking road.Through collecting literature and field investigation,the paper puts forward the principle of "high water,high discharge,low water and low drainage","storage and drainage","water pump pumping up and draining" and "attention to groundwater treatment".From the design point of view,the parameters design of the sinking Road,the selection and control of the pump,the layout of the pipeline and the layout of the section and the rainwater collection system are analyzed and some relevant suggestions are put forward.Secondly,the paper introduces the design principle of the road drainage system in detail,and analyses the calculation and value of the parameters of the rainwater design flow,the runoff coefficient,the intensity of the design rainstorm and the rainfall duration,and makes an example design of the Qingnian Road tunnel drainage system in Nantong.The drainage problem of the continuous section of the sinking section is more prominent.The paper considers a sinking section,two continuous subsidence sections,three continuous sinking segments and several continuous sinking segments,and puts forward the idea of the comprehensive design of the drainage system of the subsidence section.This paper analyzes the causes of water accumulation on sinking roads,and provides some suggestions for the design of sinking roads.This paper studies the purification system,the savings system and the reuse system of the sponge City,introduces several typical road LID facilities,and introduces the structure,applicability and advantages and disadvantages of various facilities.The SWMM software was used to simulate the drainage of the sinking road in the Changzhou section of G312,and the runoff performance of the scheme of no LID facilities,water storage module and biological retention scheme was obtained.The analysis shows that the LID facility can effectively reducethe total runoff and peak runoff of the sinking Road,reduce the scale of the drainage pumping station,reduce the cost of the project,and also realize the resource of the rainwater.Finally,the comprehensive evaluation model of the sinking road drainage system based on the concept of sponge city is established by using the multi-level fuzzy comprehensive evaluation method based on the analytic hierarchy process,and the weight of each index in the model is calculated by Yaahp software,which can provide reference for the selection and evaluation of the sinking road drainage system.