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1、第28卷增2巖石力學(xué)與工程學(xué)報(bào)Vol.28Supp.22009年9月ChineseJournalofRockMechanicsandEngineeringSept.，2009盾構(gòu)尾刷凍結(jié)法更換的溫度場數(shù)值分析1，21，2胡向東，程燁爾(1.同濟(jì)大學(xué)地下建筑與工程系，上海200092；2.同濟(jì)大學(xué)巖土及地下工程教育部重點(diǎn)實(shí)驗(yàn)室，上海200092)摘要：對(duì)上海長江隧道長距離盾構(gòu)掘進(jìn)中盾尾刷更換預(yù)案的凍結(jié)法施工溫度場進(jìn)行三維有限元數(shù)值分析，對(duì)此特殊凍結(jié)法的可行性和可靠性進(jìn)行論證。根據(jù)凍結(jié)法盾尾刷更換方案，依照實(shí)際工程的地質(zhì)條件、盾
2、構(gòu)和管片結(jié)構(gòu)以及密封油脂等相關(guān)介質(zhì)的熱物理性質(zhì)，考慮盾尾刷更換的具體工藝，采用ANSYS軟件對(duì)盾尾刷更換施工過程進(jìn)行溫度場數(shù)值計(jì)算，在此基礎(chǔ)上對(duì)凍土帷幕的發(fā)展、厚度變化和封閉性進(jìn)行分析。結(jié)果表明，開始凍結(jié)后在盾尾可以很快形成封閉的環(huán)形凍土帷幕并穩(wěn)定發(fā)展，拆卸臨時(shí)管片進(jìn)行盾尾刷更換過程中，凍土帷幕略有弱化但很快轉(zhuǎn)入繼續(xù)增長并進(jìn)入穩(wěn)定的安全狀態(tài)，論證設(shè)計(jì)的凍結(jié)法盾尾刷更換方法的可行性和可靠性。關(guān)鍵詞：隧道工程；上海長江隧道；盾構(gòu)尾刷；更換；凍結(jié)法；溫度場；數(shù)值模擬中圖分類號(hào)：U45文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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
