钉形搅拌桩复合地基承载力特性

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1、第31卷第9期2010年9月016建筑结构学报JournalofBuildingStructuresVol.31No.9Sep.2010文章编号:1000-6869(2010)09-0119-07钉形搅拌桩复合地基承载力特性1，211易耀林，刘松玉，朱志铎(1．东南大学岩土工程研究所，江苏南京210096;2．CambridgeUniversity，UKCambridgeCB21PZ)摘要:为了研究钉形搅拌桩复合地基的承载特性，通过现场复合地基荷载试验对比分析了钉形搅拌桩和常规搅拌桩复合地基的承载力与桩土应力比，以三维数值模拟分析了设计参数对钉形搅拌桩复合地基承

2、载力的影响，并探讨了钉形搅拌桩复合地基承载力计算方法。现场试验结果表明:钉形搅拌桩在节省水泥用量和施工时间的同时，取得了比常规搅拌桩更高的复合地基承载力，显示出很好的加固效果和经济效益。数值模拟结果表明:钉形搅拌桩复合地基承载力随着扩大头高度增加或桩间距减小而增大，随扩大头直径或桩长先增大后不变，即从复合地基承载力角度存在最优扩大头直径和桩长。钉形搅拌桩单桩承载力包括了扩大头下部土体的贡献，故可以将钉形搅拌桩等效为直径为扩大头直径的常规截面搅拌桩，按照桩、土复合的方法进行复合地基承载力计算，计算实例表明该方法计算的钉形搅拌桩复合地基承载力与现场荷载试验的结果比较

3、接近。关键词:钉形搅拌桩;复合地基;荷载试验;数值模拟;承载力;计算方法中图分类号:TU472.36文献标志码:ABearingcapacityofT-shapedsoil-cementdeepmixedcolumncompositefoundation1，211YIYaolin，LIUSongyu，ZHUZhiduo(1．InstituteofGeotechnicalEngineering，SoutheastUniversity，Nanjing210096，China;2．UniversityofCambridge，CambridgeCB21PZ，UK)Abs

4、tract:InordertoinvestigatethebearingbehaviorofT-shapeddeepmixedcolumncompositefoundation，comparisonbetweenT-shapedandconventionaldeepmixedcolumncompositefoundationwereconductedonbearingcapacityandcolumn-soilstressratiothroughfieldloadtests．Threedimensionalnumericalsimulationwereusedt

5、oanalyzetheinfluenceofdesignparametersonbearingcapacityofT-shapeddeepmixedcolumncompositefoundation，thenthebearingcapacitycalculationmethodwasdiscussed．FieldtestresultsindicatethatthebearingcapacityofT-shapeddeepmixedcolumncompositefoundationismuchhigherthanthatofconventionaldeepmixe

6、dcolumncompositefoundationwhilecostlesscementandconstructiontime，thustheT-shapeddeepmixedcolumncanimprovesoftgroundmoreefficientlyandeconomicallythanconventionaldeepmixedcolumn．ThesimulationresultsindicatethatthebearingcapacityofT-shapeddeepmixedcolumncompositefoundationincreasesasin

7、creasingenlargedcolumncapheightordecreasingcolumnspacing．Thebearingcapacityincreaseswithincreasingenlargedcolumncapdiameterorcolumnlengthatfirst，andthenstaysthesame，whichindicatethattherearecriticalenlargedcolumncapdiameterandcolumnlengthonbearingcapacity．ThebearingcapacityofsingleT-

8、shapeddeepmi