透水砖铺装地面垫层结构对城市雨水入渗过程的影响精选.docVIP

透水砖铺装地面垫层结构对城市雨水入渗过程的影响 中国农业大学2006,11(4):83—88 JournalofChinaAgricultura1University 透水砖铺装地面垫层结构对城市雨水人渗过程的影响 侯立柱冯绍元韩志文张书函丁跃元 (1.中国农业大学水利与土木工程学院,北京100083;2.北京市大兴区水务局,北京102600; 3.北京市水利科学研究所,北京100044) 摘要为了给透水砖铺装系统综合排水设计提供依据,建立了透水砖铺装地面物理模型,采用4种透水砖铺装 结构形式(垫层由不同厚度的无砂混凝土,中砂,砂砾料组合而成),进行了模拟降雨条件下雨水入渗过程试验研 究.结果表明:降雨过程中超渗的水流形成表层流.其水分延续入渗使地基土壤水分继续增加;4种处理在模拟降 雨1h,强度59.36mm/h的情况下产流量均为O,下渗率的大小与垫层透水性程度呈正比,与土壤初始含水率呈反 比;在模拟降雨2h,强度59.36mm/h的情况下(相当100年一遇2h降雨量),透水砖铺装地面处理1(垫层结构自 上而下为中砂10cm,砂砾料2Ocm),入渗效果最优,此时无地面产流.对于新建居民小区,道路,园林绿化等领域 布置综合排水系统,以及那些现有排水系统超载严重.难以进行管网改建或改建代价过高的区域.用透水砖铺装地 面取代不透水铺面是减少城市地面淹水频次和涝灾程度的良好途径之一. 关键词透水砖铺装路(地)面;垫层;路基;人工降雨;水分入渗 中图分类号Tv12;S273.1;TU991.114文章编号1007-4333(2006)04-0083-06文献标识码A Experimentalstudyonimpactsofinfiltrationtreated withporouspavement HouLizhu,FengShaoyuan,HanZhiwen,ZhangShuhan., DingYueyuan. (1.CollegeofWaterConservancyandCivilEngineering,ChinaAgriculturalUniversity.Belling100083,China; 2.BellingDaxlngWaterResourcesBureau,Belling102600,China;3.BellingHydraulicResearchInstitute,Belling100044,China) AbstractFouravailableporouspavementsystemswerestudiedtoevaluatetheirinfiltrationcapabilitiesofprecipita- tion.Theexperimentswereconductedtosimulatedifferentkindsofporouspavementswithdifferentsub-basematerials ineachOfcatchments.andthedischargevolumesfromeachcellweremonitored.Therelationshipbetweenrainfallin?tensity,outflowandoutflowdurationwasanalyzed.Physicalmodelswereestablishedinthelaboratory.Becauseof storageofsub-base,theinfiltrationformssubsurfaceflowintheporousconcreteblockpavingandsub-base,whichin?creaseinfiltrationintosubgradeafterrainfal1.Theresultsshowedthattherunoffcoefficientsofalltreatmentswere0un- derarainfallrateof59.36mm/h,andtheinfiltrationcoefficientofporouspavementwasindirectproportionwithporosi- tyandinverseproportionwithsoilmoisture.Inalltreatments,theoptimumthicknessoftheporouspavementis36-cm thatconsistesofa6-cmporoussurfacecourseanda30-cmsub-base(10一cmsandsand20一cmgrave1).Whenrainfall rateis59.36mm/h,andthelastingtimeis2hours,therun