根式沉井抗压承载特性的试验与数值模拟研究

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1、根式沉井抗压承载特性的试验与数值模拟研究朱小军王先勇李文帅龚维明扬州大学建筑科学与工程学院南京南大岩土工程技术有限公司东南大学土木工程学院摘要：为了研究根式沉井基础根键对提高抗压承载力的作用，设计了2组沉井抗压模型试验，对比分析了根式沉井与普通沉井荷载-位移关系，结合图像处理技术得到沉井基础周围土体位移场等成果。通过ABAQUS有限元软件对试验过程进行数值模拟，并与模型试验结果进行了对比分析。结果表明：根式沉井抗压承载性能明显优于普通沉井基础，与普通沉井相比设置根键后，根式沉井抗压承载力提高了100%;与普通沉井相比，根式沉井根键区

2、域内土体竖向位移较为明显，可见根键能调动更大范围的土层发挥抗压作用，故在井壁合理地设置根键可使根式沉井基础抗压承载力大幅提高。根式沉井基础抗压承载机理的揭示对于优化其最大限度发挥基础与土体相互作用效应的设计具有重要的参考价值。关键词：根式沉井基础;抗压承载力;模型试验;数值模拟;作者简介：朱小军(1987—),男，江苏东台人，博士，讲师，硕士生导师，主要从事深基础、复合地基研究。E-mail:zhuxiaojun@yzu.edu.cn收稿日期：2017-06-17基金：国家重点基础研究发展计划“973”项目(2013CB036304

3、)ExperimentandnumericalSimulationoncompressivebearingcapacityofrooted-caissonfoundationZHUXiao-junWANGXian-yongLIWen-shuaiGONGWei-mingSchoolofCivilScienceandEngineering,YangzhouUniversity;NanjingNandaGeotechnicalEngineeringCo.，Ltd・;SchoolofCivilScienceandEngineering,So

4、utheastUniversity;Abstract：Inordertostudytheeffectofrootstubsofcaissontoimprovethecompressivebearingcapacity,wearrangcd2groupsofcomprcssiontestoncaissonmodelinlaboratory,analyzedthecompressiveload-displacementrelationshipsofordinarycaissonwithrooted-caissonincomparison

5、,andobtainedthesoildisplacementfieldaroundthecaissonwithDigitalTmeigeCorrelation(DTC)technology.WeanalyzednumericalsimulationofmodeltestprocessbyABAQUSincomparisonwiththemodeltestresults.Theresultsshowthatthecompressivebearingcapacityofrooted-caissonisbetterthantheordi

6、narycaissonfoundation,andthecompressivebearingcapacityofrooted-caissonincreasedby100%comparedwiththeordinarycaisson.Comparingwithordinarycaisson,theverticaldisplacementofsoilinrootstubsareaismoreobvious,thatmeansawiderrangeofsoilcanplayaroleofcompressivestrengthcluetot

7、herootstubs.Thecompressivebearingcapacityoftherootedcaissoncanbegreatlyincreasedwhentherootstubsaresetreasonablyinthewallofcaisson.Revealingtherooted-caissonfoundationcompressivebearingmechanismhasanimportantreferencevalueforoptimizingthedesignofthecaissonandsoilintera

8、ction.Keyword：rooted-caissonfoundation;compressivebearingcapacity;modeltest;numericalsimulation;Received：2017-06-170引