基于加筋风积砂强度和变形特性的有限元分析

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1、分类号:学校代码:10128UDC:学号:S20041203硕士学位论文（题目：加筋风积砂强度和变形特性的有限元分析英文题目：StudiesonthePerformanceofAeoliansandReinforcedbyGeogridswithFEA研究生：许健学科专业：岩土工程指导教师：刘霖副教授二○○七年五月摘要我国西北部沙漠分布广泛，其地貌多为风积砂构成的固定、半固定及活动性沙丘。风积砂作为地基土，易发生剪切破坏，地基承载力较低。针对风积砂土的特点,采用土工格栅作为加筋材料对风积砂土进行加固。土工格栅作为加筋材料，与风积砂土产生摩擦作用，扩散土体的

2、应力，限制土体的侧向位移，从而提高土体的强度和稳定性。本文针对风积砂土特殊的物理力学性质，采用加筋技术提高风积砂土体的抗拔和抗压强度。详细整理风积砂的室外原型实验和室内模型实验数据，将加筋土与素土作比较，以探讨加筋风积砂的强度和变形特性，分析加筋机理。对实验成果进行更深入的分析从而得到加筋风积砂地基的应力分布、竖向沉降和变形规律。分别建立加筋和未加筋三维模型，利用有限元分析软件ABAQUS对加筋和未加筋风积砂在承压和上拔两种不同情况下分别进行有限元分析，研究加筋和未加筋风积砂在承压和上拔情况下变形和应力的发生、发展，并与室内模拟试验、现场实测结果进行对比。

3、结合相关资料及有限元数值模拟结果，对加筋风积砂的强度和变形特性进行分析研究。再次印证土工格栅作为加筋材料可以提高风积砂土体的抗拔和承压能力，限制扩展基础风积砂地基的变形。关键词：加筋土；风积砂；数值模拟；有限元；土工格栅AbstractThesandsdesertdistributeabroadinthenorthwestofourcountry.Thelandformisfixation,half-fixationandmovingsandsdune.Beasfoundation,theaeoliansandsoccurssheardestruction

4、easyandit’sbearingcapacitylow.Facewiththeaeoliansand’sfeature,theaeoliansandisreinforcedbyman-madewiththegeogridwhichasamaterialofreinforce.Frictionactionwillbeproduced,whengeosyntheticsasreinforcematerialcontactwithearthandcomeintomovementrelativetoearth,itcandiffusestressandlimi

5、tsidedisplacementoftheearth.Sogeosyntheticscanimprovestrengthandstabilityofthesoilmass.Accordingtothephysicalandmechanicalspecialityofreinforcedaeoliansand,authorusinggeogridtoimprovethestrengthofresistupliftbearingandresistcompressbearing.Authorgetsexactdatesfromtheaeoliansandsou

6、tdoorprototypetestandindoormodeltest.Bycomparingthedatewhichgotfromtheaeoliansandsoilstest,authorprobeintothecharacterofstrengthaddeformationofreinforcedAeoliansand,andthenanalyzethemechanismofreinforced.Atlast,Authorprofoundlyanalyzestheresultgetinthetests,anddrawingaconclusionwh

7、ichshowsstressdistributing,verticaldeformationrule.Aftersettingupthethree-dimensionalmodelwhicharereinforcedandunreinforced,AuthorapplyfiniteelementanalysissoftwareABAQUStoanalyzethereinforcedandunreinforcedAeoliansandundercompressandup-liftconditions.Thenauthorcomparesthedategotb

8、ynumbericalsimulationwiththedateg