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时间:2020-05-03
《兰渝铁路两水隧道高地应力软岩大变形控制技术-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34卷第6期隧道建设Vo1.34No.62014年6月TunnelConstructionJune2014兰渝铁路两水隧道高地应力软岩大变形控制技术赵福善(中铁十六局集团有限公司,天津300162)摘要:兰渝铁路两水隧道地质条件极为复杂,洞身围岩为千枚岩及炭质千枚岩,属极软岩,受高地应力影响,施工时发生了挤压性大变形,变形和破坏极为严重。以现场测试和理论分析为手段,结合隧道变形特征,探索和研究了适合两水隧道的软岩变形控制技术,并得出以下结论:1)软岩隧道的变形特性及稳定性(塑性区)取决于地应力、围岩的力学特性、开挖断面等,且与围岩的支护条件密切相关;2)通过采用加大预留变形量、加大支
2、护刚度、多重支护,优化施工方法、适时施作二次衬砌等手段有效地控制了大变形,较好地解决了两水隧道高地应力软岩施工问题。在此基础上,提出了软岩隧道大变形分级标准及其对应的支护参数。关键词:兰渝铁路;两水隧道;软岩大变形;高地应力;变形控制DOI:10.3973/j.issn.1672—741X.2014.06.008中图分类号:U45文献标志码:B文章编号:1672—741X(2014)06—0546—08TechnologiestoControlSeriousDeformationofSoftRockswithHighGrounaStress:CaseStudyonLiangshuiTu
3、nnelonLanzhou-ChongqingRailwayZHA0Fushan(ChinaRailway16thBureauGroupCo.,Ltd.,Tianjin300162,China)Abstract:ThegeologicalconditionsofLiangshuitunnelonLanzhou-Chongqingrailwayareverycomplex.Thesurround-ingrocksofthetunnelarephylliteandcarbonaceousphyllite,whichbelongtosoftrocks.Serioussqueezingdefo
4、rmationandfailureinducedbyhighgroundstressoccurduringtheconstructionofthetunne1.Inthepaper,technologiestocon—troltheseriousdeformationofthesoftrockswithhighgroundstressinLiangshuitunnelisstudiedonbasisofthedeformationpropertiesofthetunnelandbymeansofsitetestingandtheoreticalanalysis.Conclusionsd
5、rawnareasfollows:1)Thedeformationpropertiesandstabilityofsoftrocktunnels(plasticizedzone)mainlydependonthegroundstress,themechanicalcharacteristicsofsurroundingrocksandthedimensionoftheexcavationcross—section,andarecloselyrelatedtothesupportingconditionsofthesurroundingrocks;2)Theseriousdeformat
6、ionofthetunelhasbeenbroughtundereffectivecontrolbyadoptingsuchtechnologiesasincreasingthedeformationallowance,increasingthesupportrigidity,adoptingmulti—plesupport,optimizingtheconstructionmethodandinstallingthesecondaryliningtimely.Finally,classificationstandardofseriousdeformationofsoftrocktun
7、elsandcorespondingsupportparametersareproposed.Keywords:Lanzhou—Chongqingrailway;Liangshuitunnel;softrockdeformation;highgroundstress;deformationcontro】0引言例,提出了软岩大变形的定义及现场判定和预测方法,随着我国铁路建设的不断发展,尤其是高速铁路并给出了设计与施工建议。李国良等结合乌鞘岭和客运
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