盾构尾刷冻结法更换的温度场数值分析

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1、第28卷增2岩石力学与工程学报Vol.28Supp.22009年9月ChineseJournalofRockMechanicsandEngineeringSept.，2009盾构尾刷冻结法更换的温度场数值分析1，21，2胡向东，程烨尔(1.同济大学地下建筑与工程系，上海200092；2.同济大学岩土及地下工程教育部重点实验室，上海200092)摘要：对上海长江隧道长距离盾构掘进中盾尾刷更换预案的冻结法施工温度场进行三维有限元数值分析，对此特殊冻结法的可行性和可靠性进行论证。根据冻结法盾尾刷更换方案，依照实际工程的地质条件、盾

2、构和管片结构以及密封油脂等相关介质的热物理性质，考虑盾尾刷更换的具体工艺，采用ANSYS软件对盾尾刷更换施工过程进行温度场数值计算，在此基础上对冻土帷幕的发展、厚度变化和封闭性进行分析。结果表明，开始冻结后在盾尾可以很快形成封闭的环形冻土帷幕并稳定发展，拆卸临时管片进行盾尾刷更换过程中，冻土帷幕略有弱化但很快转入继续增长并进入稳定的安全状态，论证设计的冻结法盾尾刷更换方法的可行性和可靠性。关键词：隧道工程；上海长江隧道；盾构尾刷；更换；冻结法；温度场；数值模拟中图分类号：U45文献标识码：A文章编号：1000–6915(20

3、09)增2–3516–10NUMERICALANALYSISOFTEMPERATUREFIELDDURINGREPLACEMENTOFSHIELDTAILBRUSHBYFREEZINGMETHOD1，21，2HUXiangdong，CHENGYeer(1.DepartmentofGeotechnicalEngineering，TongjiUniversity，Shanghai200092，China；2.KeyLaboratoryofGeotechnicalandUndergroundEngineeringofMinistr

4、yofEducation，TongjiUniversity，Shanghai200092，China)Abstract：A3Dfiniteelementanalysisofthetemperaturefieldbyfreezingmethodadoptedinthepreparatoryplanfortheshieldtailbrushreplacementafterlong-distanceexcavationintheShanghaiYangtzeRiverTunnelisgiventoshowthefeasibilit

5、yandreliabilityofthespecialprogramofthefreezingmethod.Accordingtotheshieldtailbrushreplacementplanbyfreezingmethod，inconformitytothegeologicalconditions，structureoftheshieldmachineandthesegmentsandthethermo-dynamicalpropertiesofthesealant-greaseandotherrelatedmedia

6、，withthereplacementtechnologytakenintoaccount，thetemperaturefieldduringthetailbrushreplacementprocessiscomputedbythesoftwareANSYSforanalysisofthegrowthratio，thethicknessdevelopmentandthewatertightnessofthefrozensoilzone.Theresultsdemonstratethatthefrozensoilringcan

7、comeintoaclosurestateinashorttimeafterthefreezingprocessstartsandthendevelopsteadily.Itisalsoshownthatthefrozenbodywillbeweakenedwhenthesegmentsofthetemporaryringareremovedbutitcansoongoongrowingandturnintoasafestate.Theconclusionisthatthetailbrushreplacementplanby

8、freezingmethodisfeasibleandreliable.Keywords：tunnelingengineering；ShanghaiYantzeRiverTunnel；shieldtailbrush；replacement；freezingmethod；temperatur