About the authors: The four authors work in various areas of tunneling.Bernhard Maidl has been Professor for Civil Engineering, Tunneling and Construction at the Ruhr-Universität in Bochum since 1974. In 1979 he founded the engineering firm Maidl und Maidl in Bochum, which is involved in many large and complex tunnel projects in Germany and abroad.Dr. Herrenknecht is the Founder and Chairman of the world's leading mechanized shield tunneling company.Leonhard Schmid is a planner of tunneling projects and manager of a Swiss engineering firm.Willy Ritz was formerly manager of a tunneling company in Switzerland and has a great deal of experience in the construction sector.

• HISTORICAL DEVELOPMENT AND FUTURE DEMANDSBASIC PRINCIPLES AND DEFINITIONSBasic Principle and ProcedureDefinitions and TermsTUNNELINGTunneling ProcedureThe CutterheadCutting ToolsDrive UnitThrust CapacitySpecial DesignsTHRUSTGeneral InformationThrust with Gripper SystemThrust with Shield-TBMMATERIAL TRANSPORTMaterial Transport in Machine AreaMaterial Transport through the TunnelEQUIPMENT OF THE BACKUP SYSTEMSBackup System DesignConstruction ReferencesVENTILATION, DUST CONTROL, WORK SAFETY, VIBRATIONSVentilationDust ControlIndustrial Safety and Safety Planning in TBM OperationVibrationsADDITIONAL EQUIPMENTExploring and Improving of Geological ConditionsRock Support EquipmentTBM ControlInvestigation/SurveyROCK SUPPORTGeneral InformationRock Support Systems and Performance RatesSystematic Safety in the machine areaShotcrete Rock SupportSpecific SafetyStabilization in front of the CutterheadCOMBINATIONS OF TBM AND SHIELD MACHINESRoofsPartial Shields and Cutterhead ShieldsWalking Blade TBMFull FaceDouble ShieldsShields with Liquid conveyanceShields with Snail ConveyorMicro Machines for Hard RockSPECIAL PROCEEDINGS.COMBINATION OF TBM AND SHOTCRETINGDifferent UtilizationProcedure OptionsGEOLOGICAL ANALYSES AND INFLUENCESGeneral InformationInfluences on the Tunneling ProcessInfluences on the Gripper System of the MachineInfluences Rock SupportCLASSIFICATION EXCAVATION AND SUPPORTGeneral Information and Goals for mechanized tunnelingClassification SystemsNorms, Rules and RecommendationsAuthor's Recommendation for ClassificationADVERTISEMENT, BIDDING PROCESS, AWARD, CONTRACTExamples of ProcedurePlanning and Geotechnical Qualifications for the Advertisement of a Mechanized Tunneling as a Secondary OfferLININGGeneral InformationPrinciples for Lining a TunnelLining with Concrete SegmentsLocal ConcreteShotcrete Segments for permanent LiningStatistical AnalysisEXAMPLES OF COMPLETED CONSTRUCTIONSTunnel Operation with Gripper-TBMTunnel Operation with Shield-TBMIncline Shaft Excavation with Double Shield Pressure Shaft, Cleuson-Dixence