某地铁站深基坑坍塌事故原因分析与建议

56CONSTRUCTIONTECHNOLOGY20103393121.3100162.200120。、。、。。。TU753.6A1002-8498201003-0056-03CausesandSuggestiononDeepFoundationExcavationAccidentinSomeMetroStationLiHongwei1WangGuoxin21.ZhejiangChangchengConstructionGroupCo.Ltd.HangzhouZhejiang310016China2.ChinaConstructionEighthEngineeringDivisionShanghai200120ChinaAbstractTakingthecollapseaccidentofsomemetrostationdeepfoundationexcavationasexampletheconstructionschemeofdiaphragmwallwithsteelpipesupportisintroduced.Theeffectsonsafetyoffoundationexcavationarediscussedincludingsoiloverbreakdefectsofsteelsupportandfoundationexcavationmonitoringbyinvestigationofaccidentsite.Theresultsshowthatsupportsareinstalledintimecushionandfloorarepouredinsegmentation.Besidestheoverbreakisforbidden.Duetotheuncertaintyofdeepfoundationexcavationconstructioninformatizationconstructionisimplementedbesideslayoutofmonitoringpointsaccordswithcurrentcodesanddesign.Thenstructuralmeasuresofjointsbetweensteelsupportconnectionsarestrengthened.Keywordsmetrodeepfoundationexcavati[e-mail]。、、、、。。1107.8m21.05m15.7～16.3m。、、、、、。。800mm31.5、33.0、34.5m4609mm2.0～3.5m。。1。①2②2④2⑥1⑧2。0.5m。5～21m④2、、40%～67%1.10～1.85、。21～33m⑥1、、～34%～52%0.95～1.50。④22010No.3571Fig.1Crosssectionoffoundationexcavation⑥1。26。12343、45、63、5。1、34、5、625。75m7.5m3.5m。6.5m。、。、、2。2Fig.2Accidentsite3。3Fig.3Soilslidingsurfaceoffoundationexcavation。。。34。、。34343%～47%37%～51%38%～40%3。、、。4。14。、、、。3000kN。24583933000kN。、3。、。3、。5479kN3541kN35%。4、。。531、1。5。。。5.11、、、1。1、3。2。2。2。、3。37.5m1～2。1Table1Comparisonofmonitoringitems√√√√√×××√×××√√√√√√√√√√√√√√√√√×××△×××△√√√△×××△√××√△×2Table2Comparisonofmonitoringpoints1288888888224420m/520m/51108845005.2。1⑥1。。2。3116mm12mm25%1。5.3。6626239。55.115m20～25m5～10、。22BB4/d≥2B5B2/d≥5B10B1/d≥10B20B2/≥20B1/。3、、。5.230m68。、、。5.3、、、、、、、。、10m。5.42006721820068268。8SYA1。200682825241.20m33.15mm0.14mm/d816148.80m6.40mm8256.26mm0.014mm/d。。6、、。。1。2。3、。58、3m。。。1、、、、。。、。2。。。、、、。3。。4。、、、、、、。