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翠湖新城人防工程地下车库基坑支护工程及CFG桩复合地基工程设计姓名：陈道松专业：勘查技术与工程班级：勘工0041指导教师：阮文军副教授潘殿琦副教授2004年6月13日长春工程学院岩土与道桥工程系2004届毕业设计（论文）翠湖新城人防工程地下车库基坑支护工程及CFG桩复合地基工程设计陈道松长春工程学院毕业设计（论文）成绩评定表学生姓名陈道松所学专业勘查技术与工程设计题目翠湖新城人防工程地下车库基坑支护工程及CFG桩复合地基工程设计指导教师评阅成绩及评语开题报告（10分）平时成绩（10分）成果质量（20分）创新性与实用性（4分）评语：总成绩：指导教师签字：评阅教师评阅成绩及评语工作量（4分）难易程度（4分）设计内容（10分）文献及译文（2分）创新与实用（4分）评语：总成绩：评阅教师签字：答辩成绩及评语工作量（4分）难易程度（4分）成果质量（8分）口头陈述（12分）回答问题（12分）评语：总成绩：答辩委员会主任签字：总成绩指导教师成绩：；评阅人成绩：；答辩成绩：总成绩得分：总成绩等级：上分教师签字：中文摘要南宁市国凯房地产有限责任公司拟建翠湖新城人防工程地下车库，场地位于南宁市五一西路南侧的原南宁五一砖瓦厂生产区内。基坑长约80m，宽约65m，基坑周长约290m，基坑开挖深6.0m，基坑面积为5200m2，基底压力为200kpa，基坑北侧场地空旷无建筑物，故基坑北侧采用天然放坡开挖。基坑西侧距基坑边10m处有一堆碎砖，为了基坑西侧的安全，拟采用土钉支护措施。基坑东侧为小区主要道路且有管线通过，管线距离坑边约4.0m，埋深约2.0m，为保证道路及管线正常使用，拟采用土钉支护、钻孔桩+冠梁和重力式水泥土墙等措施。另外基坑南侧距已建成住宅楼约6.0m,但住宅楼进出道路紧贴基坑边，为保证住宅楼道路安全及住宅楼正常使用，南侧用土钉支护、钻孔桩+冠梁和重力式水泥土墙等措施。经方案对比，本工程基坑东侧、南侧采用机械钻孔桩进行支护，桩顶设冠梁；基坑西侧采用土钉支护；基坑北侧采用放坡开挖。由于土层承载力不足，拟采用振冲碎石桩、强夯碎石墩、CFG桩复合地基和深层搅拌桩等方法进行地基加固处理。建筑场地地质条件不太复杂，从地表往下依次为：第一层为3.4m的杂填土层；第二层为0.5m厚的淤泥层；第三层为1.2m厚的粉质粘土层，渗透系数k=0.2m/d；第四层为2.1m厚的粘土层，渗透系数k=0.15m/d；第五层为3.3m厚的粉质粘土层，渗透系数k=0.3m/d；第六层为大于5m厚的圆砾石层，渗透系数k=20m/d。地下水埋深为-4m，为了在开挖过程中，施工安全和便利，拟采用降水措施，根据地层情况，采用轻型井点降水。过方案对比论证后，最终支护方案采用混合式支护方案即基坑北侧采用放坡开挖，坡度为1：1；基坑西侧采用土钉支护，基坑开挖坡度角85º，土钉孔采用机械施工，孔径dh=120mm，土钉方向下倾斜角13度，布置土钉5层，每层布置66根，土钉采用φ22的二级螺纹钢筋，第一层土钉孔深4500mm，第二层土钉孔深5000mm，第三层土钉孔深5400mm，第四层土钉孔深5400mm，第五层土钉孔深5000mm；基坑南侧和东侧采用排桩+冠梁的支护方式，布置钻孔灌注桩103个，孔径为φ800mm，中心间距为1.5m，桩长为10.8m。降水采用坑外轻型井点降水，井点管间距在四周中间部分d1=4m，角部适当加密至d2=2m，共布置降水井66根，观察井1根。CFG桩复合地基处理共布置1791根，桩长为3.6m，桩径为φ600mm桩间距为1.75m。英文摘要AbstractGUOKAIrealestatelimitedcorporationofNanningcitydrawnupabuildingthatinthesecretgarageofgreenlakeXinchengcivilairdefenseengineering,andtheplaceislocatedinsideMayfirstbrickandtilefactoryproductionarea,onsouthofMayfirstroad.Thelengthoffoundationpitis80meter,widthis65meterandtheperimeterisabout290meter,theexcavateddepthis6meter,theexcavatedareais5200squaremeter,thepressureatthebottomofthefoundationpitis200kilopascal.Northsiteofthefoundationpithasnothingbuilding,sothenorthsideofpitcouldadoptnaturalslopeexcavates.Attheplacefarfromwestedge10meterhassomebrickrubbleandtilerubble,forthesafetyofthesideofpit,needadoptsuitablemeasuretoretainingthepieedge,inthisschemeadoptsoilnailingasretainingstructure.Theeastside,havingsecretdrainingpipesandachiefroadofresidenceareabywayofthepitedge,thedistancebetweentheedgeandtheedgeoftheroadis4meterandthedepthofthesecretpipeunderthesurfaceis2meter,inordertotheroadandpipescanusenormally,mustadoptretainingmeasureswhichhavesoilnailingretainingstructure,groutingpileswithcontinuousbeam,gravitytypecementsoilwalletc.Thenorthofthepithasabuildingwiththedistance6meterbetweenitandthebuildinghavingroadtopassinandoutalongsidetheedge,andinordertoresidenceroadsafetyandresidencebuildingnormallyuse,mustadoptsomemeasuresuchassoilnailingretainingstructure,groutingpileswithcontinuousbeam,gravitytypecementsoilwalltoretainthefoundationpitside.Contrastingthroughthescheme,thisengineeringadopteddifferentretainingmeasureatdifferentposition.Themeasure,atthesouthandeastsideisboredcast-in-placepilewithcontinuousbeam,atthenorthsideisnaturalslopeexcavates,atthewestissoilnailingretainingmeasure.Thecapacityofthesoilofthefoundationcouldn’tmeettheneedcapacity,sodrawupadoptsomereinforcingmeasuresuchasvibro-replacement,dynamic-replacement,cementdeepmixingandCFG(cement-fly-ash-gravelpile)toimprovethesub-gradebearingcapacity.Thebuildingplacegeologyconditionisnottoocomplicated,fromtheearth'ssurfaceinproperorder,Firstlayerismiscellaneousfillslayerwith3.4meterthickness.Secondlayerismucklayerwitho.5meterthickness.Thirdlayerissilty-claylayerwith1.2meterthickness,andpermeatingcoefficientk=0.2m/d.Forthlayerisclaylayerwith2.1meterthickness,andpermeatingcoefficientk=0.15m/d.Fifthlayerissilty-claylayerwith3.3meterthickness,andpermeatingcoefficientk=0.3m/d.Sixthlayerisroundgravellayerwithover5meterthickness,andpermeatingcoefficientk=20m/d.Groundwaterlevelis–4.00meter,inordertoexcavateandconstructionsafetyandconvenient,drawupdewateringmeasure,accordingtogeologyandgroundwaterconditions,coulduse“light-dutywell”todewaterthegroundwater.Bywayoftheschemecontrastingafterthepreliminarydesign,finalschemeadoptmixingretainingmeasurethatthesideinpitnorthusestheslopeexcavates,andtheslopeinclinegradientisthe1:1,thesideinwestusesoilnailingretainingmeasure,thesoilholeusemechanicconstructionandthediameteris120millimeter,theangleexcavatingslopeis85degree.soilnailinginklingunderangleis13degree,andfixingupfivelayersthatlengthoffirstlayersoilnailingholeis4500millimeter,lengthofsecondlayersoilnailingholeis5000millimeter,lengthofthirdlayersoilnailingholeis5400millimeter,lengthofforthlayersoilnailingholeis5400millimeter,lengthoffifthlayersoilnailingholeis5000millimeter,perlayerhas66columns,andsoilnailingbardiameteris22millimeter.Thesouthandeastsidesuserowpileswithcontinuousbeamstructuretoretain,fixingup103pileswhichdiameteris800millimeter,pilespacingis1.5meter,thelengthofpileis10.8meter.Dewateringmeasuremakeupof“light-dutywell”todewaterthegroundwater.wellspacingis4meterbutattheangleis2meter.Thewell