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1、本科生毕业论文(设计)题目:广场A-1J段基坑支护设计姓名:康正波学号:200903334院(系):土木工程学院专业:工程力学指导教师:职称:评阅人:职称:二0一三年六月摘要随着城市化过程中不断涌现的中高层和超高层建筑,以及对地下空I'可的开发,就产生了人量的深棊坑。在基坑开挖过程屮必然会涉及到基坑的支护,而基坑支护不仅会影响工程的进度,也会影响到工程安全,本论文主要对武汉万达广场A-IJ段基坑支护结构进行设计及稳定性验算。广场基坑分为A、B基坑两块,呈“吕”字型分布,总占地面积约57000B1
2、2,基坑开挖深度都在10m左右,属于深皋坑,A-IJ段基坑处地层主要有杂填土,粘土,淤泥质粉质粘土,粉土夹粉砂,粉砂,粉细砂,地下水类型主要为上层滞水和第四系空隙承压水,基坑支护主要采川钻孔灌注工艺的支护桩进行支护,同时在基坑上部减载放坡,坑壁设置粉喷桩止水帷幕。在进行支护桩设计计算时,土压力计算采用郎肯土压力理论,水土合算,被动土压力折减系数取1.0,支护桩的长度和入土深度采川极限土压力平衡理论和等值梁法计算确定,支护桩桩长为14.5m,求取支护桩的最大弯矩后可以按《混凝土结构设计规范》(GB
3、50010-2002)中有关公式求支护桩的配筋,此段棊坑支护桩配筋为32中28,在通过配筋验算斤还要对此段基坑的稳定性进行验算,采用里正软件分析基坑的整体稳定性,基坑底的隆起和基坑的管涌及冲溃,通过验算可知A-IJ段基坑支护设讣满足基坑的稳定性要求。关键词:深基坑深基坑维护支护设计稳定性ABSTRACTWiththeurbanizationprocess,high-risebuildingsandsupertailbuildingsarecontinuouslyemerging,andunder
4、groundspacedevelopmentprojectbecomemoreandmore.Asaresult,itgeneratedalotofdeepexcavationprojects.IntheprocessofexcavationJtinevitablyinvolvesthesupportofexcavationpit.Andtheexcavationwillnotonlyaffecttheprogressoftheproject,itwillalsoaffectengineerin
5、gsafety.Thispapermainlystudysthedesignofsupport!ngstructureandstabilitycomputationsoftheA-IJsectioninWandaPlazapit,Wuhan.WandaPlazaFoundationpitisdividedintoA,Bsections.Ontheplane,itsdistributionlikesthefigureof”吕”type.ThetotalareaofWandaPlazaFoundat
6、ionpitisabout57000m2,excavationdepthisabout10m,belongingtodeepfoundationpit.TheA-IJSectionofFoundationpitismainlyfillwithclay,siltyclay,siltysoilclipsiltysand,siltandfinesand;groundwatertypesaremainlyperchedwaterandQuaternaryconfinedporewater;pitsupp
7、ortmainlytakeboredpilessupportingtechnology,loadsheddingontheupperfoundation,pitwallsetDJMwaterproofcurtain.Duringthedesigncalculationsofsupportingpiles,earthpressurecalculatedusingthetheoryofKing,soilandwatercost-effectiveandpassiveearthpressureredu
8、ctionfactorof1.0.Thelengthandembeddeddepthofpilearedesignedwithlimitequilibriumtheoryandtheearthpressureequivalentbeammethod・Throughcalculation,pilelengthis14.5m,solvingthepilemaximummomentcanseethecode”designofconcretestructures11(GB50010-2002).Inth