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时间:2019-06-01
《围岩流变特性对隧道二衬支护时机的影响》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13卷第2期解放军理工大学学报(自然科学版)Vol.13No.22012年4月JournalofPLAUniversityofScienceandTechnology(NaturalScienceEdition)Apr.2012围岩流变特性对隧道二衬支护时机的影响周勇1,2,柳建新1,方建勤3,柳群义1(1.中南大学地球科学与信息物理学院,湖南长沙410083;2.湖南文理学院资源环境与旅游学院,湖南常德415000;3.同济大学土木工程学院,上海200092)摘要:为了研究岩体流变特性情况下隧道二衬的支护时机,首先推导了在考虑围岩流
2、变特性时,衬砌抗力、位移及围岩的位移表达式;然后以广梧高速公路茶林顶隧道岩体为工程背景,探讨了考虑岩体流变情况下,隧道二衬支护时机的确定方法,并对比了围岩拱顶下沉实测值和理论计算值。结果表明:(1)理论分析所建立的衬砌抗力、位移及围岩的位移表达式中均包含了时间参数,可确定达到不同衬砌抗力、位移及围岩位移所需要的时间;(2)围岩拱顶下沉实测值和理论计算值表现出相同的发展规律,验证了所建立方法的正确性。关键词:岩体流变特性;隧道;二衬支护时机中图分类号:TU457文献标识码:A文章编号:1009-3443(2012)02-0178-05In
3、fluenceofrockmassrheologicalcharacteristicontunnelsecondliningtime1,2,LIUJian-xin1,FANGJian-qin3,LIUQun-yi1ZHOUYong(1.SchoolofGeosciencesandInfo-Physics,CentralSouthUniversity,Changsha410083,China;2.CollegeofResourceandEnvironmentandTourism,HunanUniversityofArtsandScienc
4、e,Changde415000,China;3.CivilEngineeringDepartment,TongjiUniversity,Shanghai200092,China)Abstract:Tofigureoutthesecondliningtimeofthetunnelundertheconsiderationofrockmassrheologicalcharacteristic,firstly,theequationsoftheliningresistantpressure,displacementandsurrounding
5、rockmassdisplacementwerededucedwhentakingintoconsiderationtherockmassrheologicalcharacteristic;secondly,theChalindingtunnelengineeringoftheGuangdongYunwuHighwaywaschosenasthestudybackground,thedeterminationmethodforthesecondliningtimeofthetunnelundertheconsiderationofroc
6、kmassrheologicalcharacteristicwasproposed,andtheresultsofthemonitoringvalueandanalyticalsolutionvalueforthearchsettlementwerecompared.Theanalysisresultsshowthattheequationsoftheliningresistantpressure,displacementandsurroundingrockmassdisplacementallconsistofthefactoroft
7、ime,thatthetimeneededtoreachecertainvalueoftheliningresistantpressure,displacementandsur-roundingrockmassdisplacementcanbedetermined,andthatthedisciplinesofthearchsettlementobtainedfromtheproposedmethodarethesamewiththatfromthemonitoringdata,whichvalidatesthecorrect-ness
8、oftheproposedmethod.Keywords:rockmassrheologicalcharacteristic;tunnel;secondliningtime[3,4]准确地确定隧道二衬的合理
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