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时间:2020-05-20
《顺层挖方边坡松弛区及稳定性数值模拟分析-论文.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9卷第4期地下空间与工程学报V01.92013年8月ChineseJournalofUndergroundSpaceandEngineeringAug.2013顺层挖方边坡松弛区及稳定性数值模拟分析成永刚,王玉峰(西南交通大学地质工程系,成都610031;2.四川公路工程咨询监理公司,成都610041)摘要:为有效的研究砂泥地互层的顺层坡体在人类开挖工程影响下的失稳特征,本文以山西省长晋高速公路I(31+160一K31+460段顺层滑坡为例,通过Geo.slope软件数值模拟了该顺层坡体在边坡开挖后,防护工程没有及时对坡体损
2、失的稳定度进行补偿,造成坡体的自身锁固作用削弱,使坡体在自身势能作用下发生的松弛范围,及坡体沿处于塑性变形区的软弱层发生滑动变形的特征进行了数值模拟;并根据后续工程为有效的补偿或提高坡体的稳定性,根据施R-r-程对坡体的位移、应力等进行有效限制、防止坡体由于蠕变及松弛而导致坡体中塑性区出现直至贯通的情况进行了有效的数值模拟。依据8年来坡体的良好稳定性证明,通过数值模拟指导顺层挖方边坡的工程治理是有效的,对顺层挖方边坡松弛区及坡体在工程加固前后的稳定性数值模拟分析是合理的,可行的。关键词:顺层滑坡;数值模拟;松动区;加固工程中图
3、分类号:P642;U416.14文献标识码:A文章编号:1673—0836(2013)04—0848—06NumericalSimulationAnalysisonRelaxationandStabilityoftheCuttingBeddingSlopeChengYonggang,WangYufeng1.GeologyDepartmentofSouthwestJiaotongUniversity,Chengdu610031,China;2.SichuanHighwayEngineeringConsultingSuperevi
4、sionCompany,Chengdu610041,China)Abstract:Inordertostudytheinstabilitycharacteristicsofdipslopecomposedofsandstoneandmudstonealter—nationundertheinfluenceofhumanexcavation-onebedding—plane—controlledlandslide,locatedattheK31+160一K31+460sectionofChang—JinexpresswayinS
5、hanxiprovince-waspresentedinthispaper.Firstly,therelaxationregioncharacteristicsofthedipslopewithouttimelyreinforcementafterexcavationincludingrelaxationofslopeunderpotentialenergyduetoweakeningthelockingeffectandslidingoftheslopealongtheweaklayerinareaofplasticde—f
6、ormationwassimulatedwithGeo-slopesoftware.Andthen,thestabilityofthedipslopewassimulatedagainafteritsreinforcement.Accordingtothesimulatedresultsofthedipslopeafterreinforcement,itcanbeseenthatthesupportsystemcanredueethedisplacementandstressofslopeeffectivelytoavoidp
7、lasticareaformationinslopeduetocreepandrelaxation.Basedontheprovesinpracticesinrecent8years,itisconfirmedthatnumericalsimulationisaefi—cientwayinguidingdipslopeexcavationprojects,anditisreasonableandfeasiblethroughmakinguseofnumericalsimulationtoanalyzetherelaxation
8、regionofexcavatingbeddingslope,andstabilityofslopbeforeandafterreinforce—ment.Keywords:beddinglandslide;numericalsimulation;relaxationregi
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