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时间:2020-03-25
《风化料包边填砂路堤边坡稳定性分析.pdf》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、第30卷第7期2013年7月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentVoL30No.7Jul.2013doi:10.3969/j.issn.1002—0268.2013.07.005风化料包边填砂路堤边坡稳定性分析李英勇1,刘树堂2,曹卫(1.山东省交通运输厅公路局,山东济南250002;2.山东大学东2土建与水利学院,山东济南250061)摘要:为研究风化料包边河砂填筑路堤的边坡稳定性,基于强度折减法计算分析了填料压实度、含水率、路堤高度
2、、边坡坡度及风化料包边宽度等诸多因素对边坡安全系数的影响规律。结果表明,路堤高度确定时,随着边坡坡度的增大,路堤的边坡稳定性显著下降;随着砂含水率的减小,安全系数呈增大趋势。在文中涉及的工程条件下,风化料包边宽度不对安全系数起决定性作用,其宽度可依据施工压实要求和料源的丰足程度确定。方差分析表明,边坡坡度、风化料包边宽度及填料含水率3个因素对边坡稳定性影响的程度依次为:边坡坡度>含水率>风化料包边宽度。关键词:道路工程;边坡稳定性;强度折减法;填砂路堤;风化料包边中图分类号:U416.1+4文献标识码:A文章编号:100
3、2。0268(2013)07—0025—05AnalysisofStabilityofSand-filledEmbankmentSlopeCoveredwithWeatheredRockMaterialLIYing—yon91,LIUShu—tan92,CAOWei—don92HighwayBureauofShandongProvincialDepartmentofCommunications,JinanShandong250002,China;2.SchoolofCivilEngineering,ShandongUni
4、versity,JinanShandong250061,China)Abstract:Tostudytheslopestabilityofriversandembankmentcoveredwithweatheredrockmaterial,basedonstrengthreductionmethod,theeffectofmanyfactorsincludingcompactiondegreeoffiller,watercontent,heightofembankment,slopegradientandthickne
5、ssofweatheredrockmaterialeoverlayerontheembankmentslopesafetycoefficientisanalyzed.Theresultsindicatethat(1)whentheembankmentheightisdetermined,theslopestabilityofembankmentsignificantlydecreaseswiththeincreaseofslopegradient;(2)thesafetycoefficientincreaseswitht
6、hedecreaseofwatercontentofsand.Thethicknessofweatheredmaterialcoverlayerdoesnotplayadecisiveroleonthesafetycoefficientundertheengineeringconditioninvolvedinthepaper,andthethicknesscanbedeterminedaccordingtotherequirementofcompactionandfullnessofmaterialsources.Th
7、eresultofvarianceanalysisshowsthatthesequenceofthreeinfluencingfactorsintermsoftheinfluencingdegreeontheslopestabilityisslopegradient>watercontentoffiller>thicknessofweatheredmaterialcoverlayer.Keywords:roadengineering;slopestability;strengthreductionmethod;sand—
8、filledembankment;weatheredrockmaterialcoverlayer0引言与土地资源节约化使用具有重要的现实意义。本文依托的青(州)一临(沭)高速公路途经临沂市的高速公路建设不仅占用大量土地,而且因路堤某段稻田区,当地筑路用粘土资源匮乏,但河砂与一般较高还消耗大量诸如粘土类的筑路材料,充分
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