抗滑桩加固斜坡软弱地基路堤的数值模拟.pdf

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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