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时间:2020-06-06
《抗滑桩加固斜坡软弱地基路堤的数值模拟.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第33卷第4期岩土力学Vl0l_33NO.42012年4月RockandSoilMechanicsApr.2O12文章稿号l1000-7598(2012)04—1261-07抗滑桩加固斜坡软弱地基路堤的数值模拟蒋鑫,刘晋南,黄明星,邱延峻(西南交通大学高速铁路线路工程教育部重点实验室,成都610031)摘要:在路堤荷载作用下,斜坡软弱地基易产生侧向变形过大、滑塌失稳等病害。路堤下坡脚处采用钢筋混凝土抗滑桩,以有效限制地基侧向变形,是斜坡软弱地基路堤的核心设计原则。采用三维快速拉格朗日有限差分法,经与室内土工离心模型试验成果对比、校核,建立抗滑桩加固斜坡软弱地基路堤的精细化数值分析模型,研
2、究抗滑桩桩距、桩长、桩身弹性模量、桩身横截面尺寸及桩位等设计参数对其内力、变位的影响。研究表明:下坡脚处实施抗滑桩可显著约束斜坡软弱地基侧向变形;需综合考虑桩身受力、经济性、施工等因素确定合理的桩距;桩长应深入滑移面以下,但随着桩长的增长,加固效果增长不明显;随着桩身弹性模量、桩身横截面尺寸的增加,抗滑桩的加固效果得到一定提高;抗滑桩宜设置在下坡侧路堤边坡的中部。关键词:道路工程;斜坡软弱地基;路堤;抗滑桩;有限差分法中图分类号:Tu751.4文献标识码:ANumericalsimulationofembankmentonslopedweakgroundreinforcedbyanti-
3、slidepilesJIANGXin,LIUJin-nan,HUANGMing-xing,QIUYan-jun(MOEKeyLaboratoryofHigh-speedRailwayEngineering,SouthwestJiaotongUniversity,Chengdu610031,China)Abstract:Slopedweakgroundundertheloadoftheembankmenteasilytriggersmajorengineeringaccidentssuchaslargelateraldeformationandslump.Itisthecoredesign
4、principlesofembankmentonslopedweakgroundthatapplicationofreinforcedbyconcreteanti—slidepileatthecornerofembankmentcanefectivelylimitlateraldeformationofthefoundation.Thispaperstudiestheinfluenceofthepiledesignparameterssuchaspilespacing,pilelength,elasticmodulus,cross—sectiondimensionandthepositi
5、onofpilesonitsinternalforcesanddeformationbyusing3DfastLagrangiananalysisofcontinua,comparingwiththeresultsofindoorgeotechnicalcentrifugalmodeltests,andbuildingprecisenumericalanalysismodelofembankmentonslopedweakgroundreinforcedbyanti—slidepiles.Researchresultsshowthat,usinganti—slidepilesatthed
6、ownhilltoeofembankmentcouldsignificantlyrestrictthelateraldeformationofslopedweakground.Itwillcomprehensivelyconsiderthefactorssuchasforce,economy,constructionetc.inordertoconfirmthereasonablepilespacing;anti-slidepilesmustpenetratepotentialslipsurface,butwiththeincreaseofthelengthofpile,thereinf
7、orcementefectdoesnotsignificantlyincrease;withtheincreaseofelasticmodulus,cross—sectiondimensionofpile,thereinforcementefectisimprovedinsomeextent;anti—slidepileissuitabletosetatthemiddleofbypassdownhillslopeoftheemban
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