基坑开挖数值模拟中土体本构模型的选取

《基坑开挖数值模拟中土体本构模型的选取》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、Seediscussions,stats,andauthorprofilesforthispublicationat:https://www.researchgate.net/publication/283598430SelectionofsoilconstitutivemodelsfornumericalsimulationoffoundationpitexcavationArticle·May2014DOI:10.6052/j.issn.1000-4750.2012.08.0583CITATIONSREADS2832authors,includi

2、ng:E.X.SongTsinghuaUniversity137PUBLICATIONS856CITATIONSSEEPROFILEAllcontentfollowingthispagewasuploadedbyE.X.Songon07July2016.Theuserhasrequestedenhancementofthedownloadedfile.第31卷第5期Vol.31No.5工程力学2014年5月May2014ENGINEERINGMECHANICS86文章编号：1000-4750(2014)05-0086-09基坑开挖数值模拟中土体本构模

3、型的选取宋广，宋二祥(清华大学土木工程系，北京100084)摘要：基坑开挖数值分析中的一个关键问题是选取一个合适的土体本构模型。该文通过对基坑开挖过程中土体的主要应力变化路径进行分析，指出开挖条件下的土体本构模型应能合理考虑土体变形特性的应力路径相关性和压硬性。在介绍与分析几种常用土体本构模型特点的基础之上，通过模拟应力路径三轴试验、基坑工程算例与工程实例的对比分析，探讨了常见土体本构模型的适用性。分析表明，HardeningSoilModel采用了不同的加荷与卸荷模量，能够反映土体应力路径的影响，且考虑了土体模量的应力水平相关性，能预测得到较合理的

4、坑壁侧移、地表沉降以及支护结构的内力，因而建议采用HardeningSoilModel进行基坑开挖数值模拟分析。关键词：基坑开挖；应力路径；压硬性；本构模型；数值模拟中图分类号：TU476文献标志码：Adoi:10.6052/j.issn.1000-4750.2012.08.0583SELECTIONOFSOILCONSTITUTIVEMODELSFORNUMERICALSIMULATIONOFFOUNDATIONPITEXCAVATIONSONGGuang,SONGEr-xiang(DepartmentofCivilEngineering,Tsin

5、ghuaUniversity,Beijing100084,China)Abstract:Oneofthekeypointsinnumericalsimulationoffoundationpitexcavationistoselectapropersoilcostitutivemodel.Themainstress-pathinsoilaffectedbydeepexcavationhasbeenanalyzed.Anditisnotedthatapropersoilconstitutivemodelshouldbeabletoconsiderthe

6、deformationcharacteristicsofunloadingstress-pathandstress-dependentstiffnessreasonably.Severalsoilconstitutivemodelscommonlyusedingeotechnicalnumericalanalysisarediscussed.Thesuitabilityoftheseconstitutivemodelsusedinnumericalanalysisofdeepexcavationisexaminedthroughsimulatings

7、omestresspathtriaxialtestsandanalyzingsometypicalexcavationprojects.TheHardeningSoilModelusesastress-dependentstiffness,differentforloadingandun-/reloading.Bothdeformationofthefoundationpitsupportstructuresandthesettlementofgroundcanbepredictedwellbyusingthismodel,thusitisrecom

8、mendedforuseinnumericalanalysesofdeepexcavations.Keywo