临近深基坑区域基坑支护设计方案选型分析

AnalysisofDesignProposalSelectionforaSupportSysteminaDeepandComplexFoundationPitProjectYuanChunhuiGuoDianta（TheArchitecturalDesignandResearchInstituteofGuangdongProvinceGuangzhou510010，China）Abstract：OnedeepfoundationpitsupportingprojectislocatedinJujiangnewtown，whereit'sthebustlingareainGuangzhou.Theexca-vationissodeepforthisproject，whichissurroundedwithmanypipelinesandveryclosetothesiteofanotherdeepexcavationonthenorthernsideoftheproject，alsotheenvironmentiscomplexaroundthispit.Accordingtothecomparativeanalysisfortheproposalsselec-tion，thecombinedsupportsystemisusedinthesectionwhereit'sneartothedeepexcavation，whichisthesystemofsoilnailingwallupperandpilesoftworowsofprestressedanchorstructrue.Theproposalnotonlycostless，butalsoshortenthetimeunderthepremiseofensur-ingprojectsafety.Themonitoringresultsshowsthatdeformationissmallerforthefoundationpitexcavation，andeffectislesstotheenvi-ronmentallaround.Thesupportingsystemissafe，reliable，economicalandreasonable，whichisareferenceforsimilarprojectdesign.Accord-ingtothecomparativeanalysis，thecalculationofthesupportingpilesdeepdisplacementarenearlyconsistentwiththemonitoring.Keywords：deepfoundationpit；supportsystemdesign；combinedsupportsystem；monitoring；deformationGUANGDONGARCHITECTURECIVILENGINEERING201422FEB2014No．21。［1～2］。。。24、223。。3075m2216m15.05m17.35m1。3617.0m16.0m2.0m26.0m3.5m23.5m17.6m3。、、、、袁春辉郭典塔（广东省建筑设计研究院广州510010）广州市珠江新城某一深基坑支护工程地处城市繁华地段，开挖深度大，周边管线多且基坑北面临近正在施工地下室结构的深基坑，周边环境复杂。通过方案选型对比分析，对临近深基坑区域采用“上部土钉墙+支护桩+2道预应力锚索”的组合支护体系，在保证基坑安全的前提下，既可节省造价又可缩短工期。监测结果表明基坑开挖变形小，对周边环境影响小，支护体系安全可靠，经济合理，为类似工程设计提供一定的参考作用，通过对比分析，支护桩深层位移计算结果与监测结果基本吻合。深基坑；支护设计；组合支护体系；监测；变形71rgcm3ckPa°qskPa〈1〉1.8101020～25〈2-1〉1.76820～22〈2-2〉1.95221835～40〈2-3〉1.9502340～45〈2-4〉1.9803260～70〈3〉2.0540～452670～80〈4〉2.150～602880～120〈5〉2.2150～20032150～200〈6〉2.3250～30032250～3002m0-208-164-1212-8ZK1-48.50ZK29.22ZK39.65ZK49.79〈1〉〈2-2〉〈2-3〉〈3〉〈4〉〈6〉〈5〉〈6〉FEB2014No．22014225.3m5.5m。。、。33.1〈1〉、〈2-1〉、〈2-2〉、〈2-3〉、〈2-4〉、〈3〉、〈4〉、〈5〉、〈6〉。2。3.2～。0.2～4.05m。44.1①②③、。,、、。4.214m。、。⑴1。⑵“++3”。。1f1000@12004、3f550@350-15.80-6.55f600@1200-18.10-8.85-17.90-8.55-0.758.500-0.758.500-0.75-0.752211f1200@1700f500@35013.4m10.1m56#32#2.7m15.8m29~363843訳訴±0.009.251000450050006450173504000-18.101760023500±0.009.25-5.25-10.05-14.90-17.20590035004000173503600-18.1039501000100020005000210035°40°-0.75f48L=6m@1.2m,Na=65kN-6.6515001200120012008001∶1.25×7f5L=21m@2.4mLf=6mYF=450kN680kN3×7f5L=15m@2.4mLf=5mYF=350kN500kN15°15°Na=55kNNa=70kNNa=45kN2200-4.502300176006300400050002000-19.80-2.2080300×300f1000@120030°30°30°235001-0.75100010001000-5.25-10.05-14.90-17.202200-2.20-4.50-19.80400630040005000230020003×7f5L=24m@1.5mLf=7mYF=200kN400kN4×7f5L=24m@2.4m,Lf=6mYF=250kN625kN4×7f5L=21m@2.4m,Lf=6mYF=250kN650kN23300×3003f550@350100140013300×300f1000@1200f550@350@2m×2m300×300315°15°FEB2014No．2201422“++3”3a。。。。“++2”“++2”1“+2”。2。12、。23b。。“++3”。1.362［3～4］。4.3、。。5。、、、、［5］。、。4。32#、56#15。32#8.2mm7.1mm56#9m5.8mm6.0mm1.3mm。。95訳32#訴56#mmm012345678901234141312111098765mmm012345670241416121086。6、。⑴“++2”。⑵。⑶。⑷、、。1.M.19972.M.20033GJB02-98S4JGJ120-2012S5GB50497-2009SFEB2014No．22014222222222222222222222222222222222222222222①、24h②、③④。4、、、、。、。9.8mm19.86mm14.7mm43mmIPS。5IPSIPS。、、30m、、。1210