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时间:2018-01-02
《加筋土坡临界高度极限分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、维普资讯http://www.cqvip.com第2O卷第1期中国公路学报Vol_2ON0.12007年1月ChinaJournal0fHighwayandTransportJan.2007文章编号:1001-7372(2007)0卜0001O6加筋土坡临界高度的极限分析崔新壮,姚占勇,商庆森,冯洪波(1.山东大学土建与水利学院,山东济南250061;2.中国水利水电科学研究院岩土工程研究所,北京100044)摘要:为了解布筋形式与布筋密度等因素对土坡加筋效果的影响,用上限法对加筋土坡的临界高度进行了极限分析。使用刚
2、体旋转破坏机构,并假设筋材的失效模式为本身的拉伸破坏,研究了3种布筋形式(均匀布筋、上稀下密线性布筋及上密下稀线性布筋)对边坡临界高度及滑裂面形状与位置的影响。结果表明:在平均布筋密度相同的情况下,上稀下密线性布筋对应的临界高度最大,而上密下稀线性布筋对应的临界高度最小;对于3种布筋形式,边坡临界高度都随平均布筋密度增大而明显增大;不同的布筋形式对应的滑裂面的形状与相对位置有较大差别;对于均匀布筋土坡,上限解与试验结果及有限元解有较好的一致性。关键词:道路工程;加筋土坡;上限法;lI盏界高度中图分类号:U416.12
3、文献标志码:ALimitAnalysisofCriticalHeightsofReinforcedSoilSlopeCUIXin—zhuang’。,YAOZhan—yong,SHANGQing—sen.FENGHong—bo(1.SchoolofCivilandHydraulicEngineering,ShandongUniversity,Jinan250061,Shandong,China;2.InstituteofGeotechnicalEngineering,ChinaInstituteofWaterResou
4、rcesandHydropowerResearch,Beijing100044,China)Abstract:Forstudyingtheinfluenceofreinforcementdistributionmodesanddistributiondensityonreinforcementeffectsforsoilslope,theupper—boundmethodofthelimitanalysiswasemployedtocomputethecriticalheightsofthereinforcedsoi
5、lslope.Intheanalysis,therigidbodyrotationalfalluremechanismwasadoptedandthenvalidationmodeOfthereinforcementWasassumedtobeitsowntensilefailure.Influenceof3typesOfreinforcementdistributionmodes。ieuniformmode,downwardly—stronglinearmodeandupwardly-stronglinearmod
6、eoncriticalheightofreinforcedsoilslope,andshapeandpositionofslipsurfacewereconsidered.Withthesameaveragereinforcementdensity,thedownwardly—strongmodegavethemaximumcriticalheight,andtheupwardly—strongmodegavetheminimumone.Forthe3typesofreinforcementdistributionm
7、odes,thecriticalheightsallincreasedobviouslywiththeincreaseofaveragereinforcementdistributiondensity.However,fordifferentreinforcementdistributionmodes.theshapesandrelativelocationsofslippagecracksurfaceshadgreatdifference.Resultsshowthatthecriticalheightsgotfr
8、omupper-boundmethodarefoundtobeingoodagreementwiththeresultsoftestsandFEM.Keywords:roadengineering;reinforcedsoilslope;upper—boundmethod;criticalheight收稿日期:2006—06—18基金项目:国家
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