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时间:2020-03-25
《基于监测数据的加筋高填路堤分层填筑变形特性分析.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31卷第2期土木工程与管理学报Vo1.31No.22014年6月JournalofCivilEngineeringandManagementJun.2014基于监测数据的加筋高填路堤分层填筑变形特性分析雷鸣,汪华斌,李纪伟,徐一鸣,丘旭富,郑必灿(1.广东省长大公路工程有限公司,广东广州51o620;2.华中科技大学土木工程与力学学院,湖北武汉430074)摘要:在高填路堤建设中,铺设土工格栅对沉降的影响一直是关注热点之一。结合云罗高速公路高填路堤建设,本文采用数值方法模拟了分层填筑路堤施工过程的沉降规律,并结合监测数据,探讨了高填路堤加筋土在沉降控制方面的基本规律。结果表明:高
2、填路堤填土过程中,土工格栅使土体位移重新分布。水平位移和垂直位移均减小了,这在一定程度上防止了不均匀沉降,且土工格栅对水平位移的影响随着填土厚度的增加而加大。同时,在典型路堤加筋土分层填筑过程中,单向土工格栅降低水平位移幅度为8.74%,而降低沉降幅度为3.82%。在分层填筑过程中,筋材有效地控制了路堤的不均匀沉降,使路堤最大沉降值降低,且监测点的水平位移最大降幅分别为8.62%、8.38%和4.16%。关键词:加筋土:高填路堤;监测数据;分层填筑;路堤变形;沉降规律中图分类号:U416.12文献标识码:A文章编号:2095-0985I2014)02-0016-07Analysis
3、ofDeformationCharacteristicsinStratifiedFillingofReinforcedHighEmbankmentBasedonMonitoringDataLEIMing,WANGHua.bin。,LIJi.wei,XUYi-ming,QIUXu-fi,,ZHENGBi—can(1.GuangdongProvincialChangdaHighwayEngineeringCoLtd,Guangzhou510620,China;2.SchoolofCivilEngineeringandMechanics,HuazhongUniversityofScien
4、ceandTechnology,Wuhan430074,China)Abstract:Thereinforcedembankmentwaspopularintheconstructionofmountainousexpressways.Inhighreinforcedembankments,thestrengthofreinforcedsoilscanbeincreased,andthustheembankmentbecomesmorestableafterthegeogridsareutilized.However,thekeyissuewashowthereinforcedso
5、ilseffectthesettlementofhighembankment.Thepresentstudyaimstoanalyzethefunctionofgeogridsinthecontrollingofdeformationinthereinforcedhighembankment.TakingaongoingembankmentasaexampleintheYunfu—Luodingexpressway,numericalsimulationsusingFLAC3Dwerecarriedoutintheprocessofeachtwo—metersfillingofre
6、inforcedsoils.Meanwhile,monitoringdatawereanalyzedafterdetailedinvestigationsinthehighembankment.Resultsshowedthatdisplacementofreinforcedsoilswasredistributedduetotheutilizationofgeogrids,inwhichverticalandhorizontaldisplacementdecreased.Itcanbeidentifiedthatthedifferentialsettlementcanbeeffe
7、ctivelycontrolledifthegeogridswereusedinthehighembankment.Itcanalsobenotedthatthehorizontaldisplacementincreasedwiththeheightofreinforcedsoils.Duringtheprocessoflayeredfilling,itwasshownthatthedegreeofdecreasinginhorizontaldisplacementw
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