Research On The Technology And Scheme Of The Rain And Flood Recharge In The Undercut Overpass Of Beijing

Combined with the three kinds of rainwater exclusion methods "Drain, Storage, Infiltration" which has been put forward in design scheme of the rainwater pumping station system upgrading and rebuilding project of the overpass in the urban area of Beijing, as well as solving the problem of groundwater infiltration recharge, the thesis carry on the survey of geology and hydrogeological conditions of undercut overpass area in Beijing. According to the feature of rainfall and flood, the thesis put forward the technology of rainwater and flood infiltration:Infiltration pool, tube wells, large wells, radiation wells, which suit for the undercut overpass area. Moreover, according to the requirement of groundwater protection, the thesis put forward the water quality standard in rainwater and flood infiltration, carry on the suitability evaluation and put forward the result of four standards:Suitable for recharge, Compared suitable for recharge, Not suitable for recharge and Prohibited for recharge in undercut overpass area. On the basis of the result, the scheme select the Mayu Undercut Overpass as an example for groundwater pumping and recharge, and then calculate the hydrogeological parameters and predict the recharge capacity on different recharge technology, finally put forward the plan of rainwater and flood recharge in Mayu Undercut Overpass which provide the technical support and basis for engineering design. Rainwater and flood recharge not only save out the space of reservoir and also improve the capacity of protection for rainwater and flood in undercut overpass area, as well as increase the groundwater resources. The results of the study will play a positive role in urban flood control and drainage, and produce positive social benefits.The thesis carry on the basic and applicable study on the key technology of rainwater and flood recharge in undercut overpass area, which can provide technical support for Beijing undercut overpass rainwater pumping station system upgrading and rainwater control and utilization project, moreover promote the effect of rainwater and flood recharge, provide positive effect for the prevention of waterlogging caused by rainstorm and the utilization of rainwater in the overpass area. Meanwhile, by the faster progress of urbanization in China, extreme weather occur frequently due to the urban heat island effect. Nowadays urban waterlogging due to the short-term heavy rainfall put heavy pressure on urban drainage capacity, the shortage of groundwater resources coexists with the flood disaster in form of rainwater floods in northern cities of China, the research results will reduce the rainwater flood disaster in large and medium cities in China and provide a new direction for increasing ground water resources.