隧道盾构-毕设论文外文翻译（翻译-原文

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1、毕业设计（论文）外文文献翻译院系：土木工程与建筑系年级专业：土木工程姓名：学号：附件：盾构SHIELDS指导老师评语：指导教师签名：年月日SHIELDS【Abstract】Atunnelshieldisastructuralsystem,usedduringthefaceexcavationprocess.Thepapermainlydiscussestheformandthestructureoftheshield.Propulsionfortheshieldisprovidedbyaseriesofhydraulicjacksinstalledinth

2、etailoftheshieldandtheshieldiswidespreadusedintheundergroundenvironmentwherecannotbeinlongtimestable.Themainenemyoftheshieldisgroundpressure.Non-uniformgroundpressurecausedbythesteeringmayactontheskintendstoforcetheshieldofflineandgrade.Andworkingdecksinsidetheshieldenabletheminer

3、stoexcavatetheface,drillandloadholes.【Keywords】shieldhydraulicjacksgroundpressuresteeringworkingdecksAtunnelshieldisastructuralsystem,normallyconstructedofsteel,usedduringthefaceexcavationprocess.Theshieldhasanoutsideconfigurationwhichmatchesthetunnel.Theshieldprovidesprotectionfo

4、rthemenandequipmentandalsofurnishedinitialgroundsupportuntilstructuralsupportscanbeinstalledwithinthetailsectionoftheshield.Theshieldalsoprovidesareactionbaseforthebreast-boardsystemusedtocontrolfacemovement.Theshieldmayhaveeitheranopenorclosedbottom.Inaclosed-bottomshield,theshie

5、ldstructureandskinprovide360-degreegroundcontactandtheweightoftheshieldrestsupontheinvertsectionoftheshieldskin.Theopenshieldhasnobottomsectionandrequiressomeadditionalprovisionisapairofsidedriftsdriveninadvanceofshieldexcavation.Railsorskidtracksareinstalledwithinthesesidedriftst

6、oprovidebearingsupportfortheshield.Shieldlengthgenerallyvariesfrom1/2to3/4ofthetunneldiameter.Thefrontoftheshieldisgenerallyhoodedtosothatthetopoftheshieldprotrudesforwardfurtherthantheinvertportionwhichprovidesadditionalprotectionforthemenworkingatthefaceandalsoeasepressureontheb

7、reast-boards.Thesteelskinoftheshieldmayvaryfrom1.3to10cminthickness,dependingontheexpectedgroundpressures.Thetypeofsteelusedintheshieldisthesubjectofmanyargumentswithinthetunnelingfraternity.SomeprefermildsteelintheA36categorybecauseofitsductilityandcaseofweldingintheundergrounden

8、vironmentwhereprecisionworkisdiff