回灌技术在天津市海绵城市建设中的应用研究

Application of recharge technology in the construction of sponge city in Tianjin

针对天津市城区浅部地层透水性较差,常规海绵城市建设措施难以快速将雨水自然消纳的问题,结合天津市水资源不足、地面沉降突出的现状,创造性的提出将回灌技术应用于海绵城市建设中,通过雨水回灌提高天津市区降雨的就地消纳和利用率,使原本进入咸水层的雨水转化为地下资源。以天津海绵城市建设某示范片区为例,建立了研究区雨水回灌的数值模拟模型,应用数值模型分别对回灌井加压和不加压条件下的可回灌量进行计算,分析了在天津市开展雨水回灌的可行性,并依据雨水回灌可注水量的计算结果,反推回灌井的井径,为工程施工提供依据。

In view of the poor permeability of the shallow stratum in Tianjin urban area and the difficulty of natural absorption of rainwater by conventional construction measures,combined with the present situation of insufficient water resources and prominent land subsidence in Tianjin,this paper creatively puts forward the application of recharge technology in the construction of sponge cities,then improves the rainfall of Tianjin urban area and transform the rainwater into underground water resources by rainwater recharge.Taking a demonstration area of Tianjin Sponge City as an example,this paper establishes a numerical simulation model of rainwater recharge in the study area,calculates the rechargeable quantity of the rechargeable well under the conditions of pressure and non-pressure by using the numerical model,analyzes the feasibility of developing rainwater recharge in Tianjin,and backstepping the caliper of recharge well based on the calculation results of water injection rate of rainwater recharge,this result can provide basis for engineering construction.