基于加筋土强度理论及加筋路堤有限元分析

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1、y826727长安大学硕士学位论文加筋土强度理论及加筋路堤有限元分析陈辉指导教师姓名益塞盘堂置然塞墼蕉申请学位级别瑟．圭专业名称羞圭：三壅论文提交日期2il篮。Q5．论文答辩日期2盟监。Q亘：曼互学位授予单位一益塞盘鲎答辩委员会主席夏盎担叁撞．一学位论文评阅人夏壅担丝撞望垒壶高三二00五年六月摘要本文通过直剪试验和三轴剪切试验，对土与加筋材料间的界面特性以及加筋土的强度进行了研究。试验表明，土筋间的剪切关系服从莫尔一库伦理论：其摩擦系数随着压实度的增大而增大。加筋土的强度随着压实度、加筋层数及加筋材料弹性模量的增大而增大；加筋材料沿周向布鼍的加筋土强度比加筋

2、材料沿径向布置的加筋土强度要大。在加筋路堤有限元分析中，针对某加筋路堤按不同高度、不同加筋间距、不同边坡坡度、不同加筋位置的土工布加筋路堤及不加筋路堤进行了计算和分析。结果表明，加筋路堤边坡的水平位移随着路堤高度的增加、加筋间距的变小及加筋位置的上移而增大，边坡的变化对加筋路堤边坡的水平位移影响较小。路堤内部的大主应力以路堤中线为对称轴，从路堤边坡左侧到路堤中线依次增大。地基表面垂直位移及侧向位移随路堤高度的增加而增加，随边坡的增大而增大，加筋间距及加筋位置的变化对地基表面沉降及侧向位移影响不大。关键词：直剪试验三轴剪切试验摩擦系数强度加筋路堤有限元分析Ab

3、stractThestrengthofreinforcedsoilandthecharacteristicofinterfacebetweensoilandreinforcementareresearchedbythesheartestsandthetriaxialtests．TheresultshaveshownthattheshearrelationshipbetweensoilandreinforcementobeystoMohr—Coulombtheory．Themorethedegreeofcompactionis，themorethecoeffi

4、cientoffrictionbetweensoilandreinforcementis．Withtheincreaseofthedegreeofcompaction，theelasticmodulusandtheamountofreinforcement，thestrengthofreinforcedsoilincreases。Thestrengthofreinforcedsoilaroundcircumferenceisbiggerthanthatarounddiameter．Infiniteelementanalysis，accordingtothet

5、estroad，differentreinforcedembankments，whichareofdifferentheights，slopes，spacinganddistributions，areanalyzed．Itisshownthatwhentheheightoftheembankmentincreasesorthespacingfromonereinforcementtoanotherdecreases，thehorizontaldisplacementofthereinforcedembankment’sslopeincreases．Thepo

6、sitionofthereinforcementmovingupwards，thehorizontaldisplacementofthereinforcedembankment’sslopeincreases．Thechangeoftheslopehasalittleinfluenceinthehorizontaldisplacementofthereinforcedembankment’sslope．Theembankmentmidlineisthesymmetricaxleofmajorprincipalstressandmajorprincipalst

7、ressdecreasesfromthemidlineoftheembankmenttotwosidesoftheembankment．Iftheembankment’sheightandslopeareincreased，thefailuresurfaceandlateraldisplacementoftheembankmentwillalsoincrease．Thedistancefromonereinforcementtoanotherandthepositionwherereinforcementslocateinhavealittleinfluen

8、ceinthefailuresurfaceandla