基于InfoWorks ICM模型的地铁场站内涝积水防控研究

Prevention and control of waterlogging in metro stations:an InfoWorks ICM analysis

选择郭公庄和宋家庄地铁场站为研究对象,采用InfoWorks ICM模型软件构建洪涝模型并开展内涝积水模拟分析.模拟结果表明:100a一遇长历时(24h)暴雨情景下郭公庄地铁场站最大积水深度为0.922m,宋家庄为0.607m;在重现期达50a一遇时宋家庄所有管网即达到满流状态.分析结果表明:郭公庄内涝积水主要是由于下游水位顶托;而宋家庄主要是由于管网排水能力不足.本研究基于模拟结果提出了内涝积水防控措施,经海绵城市改造措施后,10a一遇短历时(1h)暴雨情景下宋家庄地铁场站出水口洪峰相对未改造情景削减了22.2%;经管网改造后,1a一遇长历时(24h)暴雨情景下宋家庄内涝积水削减率为100.0%;郭公庄3台排水泵全运行状态下,郭公庄总积水量相对无泵情景削减了29.5%.

As the frequency of urban extreme storm weather increases,infrastructure of urban rail transit is increasingly affected by waterlogging.Aiming to enhance waterlogging prevention and control capacity at Metro stations,an InfoWorks ICM model was established,waterloggings at Guogongzhuang and Songjiazhuang metro stations were simulated.Long duration(24 h)rainstorm waterlogging simulation showed maximum waterlogging depth of 0.922 m at Guogongzhuang and 0.607 m at Songjiazhuang on a 100-year rainstorm scenario.With a recurrence period of 50 a,all rainwater pipelines in Songjiazhuang would reach full flow state.Waterlogging at Guogongzhuang was found to be mainly due to top support of downstream water level,at Songjiazhuang mainly due to insufficient drainage capacity of rainwater pipelines.Waterlogging prevention and control measures were proposed based on these simulations.After sponge measures reform,flood peak at the outlet at Songjiazhuang Metro Station was reduced by 22.2%under short duration(1 h)on a 10-year rainstorm scenario.Waterlogging was reduced by 100.0% at Songjiazhuang under long duration(24 h)on a one-year rainstorm scenario after rainwater pipeline transformation.With full operation of three drainage pumps at Guogongzhuang Metro,total accumulated water volume was reduced by 29.5%compared with without pumps.