红枫连拱隧道开挖稳定性分析(5)

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446河海大学学报(自然科学版)第33卷3　结　　论

红枫隧道地质条件较好.从计算断面K214+725的结果可知,围岩位移较小,最大为6181mm,小于1cm,说明围岩应变率较低.围岩衬砌后位移变化很小,说明按衬砌类型,围岩变形基本满足要求.从应力情况看,围岩拉应力随着隧道开挖范围的扩大而逐渐变大.除局部位置外,衬砌基本满足抗拉要求.

参考文献:

[1]寇晓东,周维垣,杨若琼,等.FLAC23D进行三峡船闸高边坡稳定分析[J].岩石力学与工程学报,2001,20(1):6—10.

[2]龚纪文,席先武,王岳军,等.应力与变形的数值模型方法[J].华东地质学院学报,2002,25(3):220—227.

[3]许强,严明,黄润秋.某水电站左岸深裂缝对工程荷载下边坡稳定性影响的FLAC3D分析[J].地质灾害与环境保护,2002,13

(1):81—84.

[4]丁秀美,黄润秋,臧亚君.预应力锚索框架作用下附加应力的FLAC3D模拟[J].成都理工大学学报(自然科学版),2003,30

(4):339—345.

[5]陈祥军,汤劲松.用FLAC3D进行马崖高边坡稳定性分析[J].3)—79.

[6]邓昌铁,魏庭光.),1999,27(5):68—

72.

[7]张兴来,钟云健.,2003,22(1):5—8.

[8]王胜辉,杜小平,袁勇,.[J].重庆交通学院学报,2004,23(3):10—12.

[9]刘小兵,彭立敏,[J].中国公路学报,2001,14(4):80—84.

[10]吴继敏,高正夏,岩体圆形洞室锚杆前后应力位移分析[J].河海大学学报(自然科学版),1999,27(4):107—110.

[11]吴继敏,魏继红,孙少锐.某电站勘探平洞超挖块体评价[J].河海大学学报(自然科学版),2001,29(2):57—60.

StabilityanalysisofexcavationofHongfengmultiplearchtunnel

CHENYong2hui1,PENGJian2zhong2,LIWen2qi3,CHENXian2chun2

(1.GeotechnicalResearchInstituteofHohaiUniversity,Nanjing210098,China;

2.JinliwenHighwayYongjia2LuchengSectionEngineeringConstructionBureau,Wenzhou325106,China;

3.WenzhouLongjianRoadandBridgeEngineeringCompany,Wenzhou325000,China)

Abstract:BasedonfieldinvestigationandtheoreticalanalysisofgeologicalcharacteristicsoftheHongfengmultiplearchtunneloftheJinliwenHighway,thecurrentsituationandvariationcharacteristicsofthestressfield,deformationfieldandplasticfailurezoneofsurroundingrockduringtheexcavationandstrengtheningofthetunnelwereanalyzed.Theresultsshowthatthestrainrateandthedisplacementofsurroundingrockarelowduringexcavation,andthatthedeformationofsurroundingrockwiththelinercurrentlyusedmeetstherequirementofstability.Itisalsoindicatedthatthetensilestressinsurroundingrockincreaseswiththeextensionoftheexcavatedarea,andthetensilestrengthofthelinerissatisfactoryexceptatsomepositions.

Keywords:JinliwenHighway;Hongfengmultiplearchtunnel;excavation;stability;numericalsimulation