The determination of performance‐ and payment‐relevant parameters in TBM tunnelling – State of the technology and outlook / Ermittlung leistungs‐ und vergütungsrelevanter Parameter für TVM‐Vortriebe – Stand der Technik und Ausblick

Abstract

The success of mechanised tunnelling is greatly influenced by the interactive behaviour of machine and ground. A multitude of published research and practice reports documents the problem of a targeted forecast based on tests and forecasting models [19]. The paper describes the currently used methods of estimating performance-relevant parameters, including current research into the subject of crack propagation in solid rock and developments in disc force measurement on the tunnel boring machine and its forecasting from laboratory tests. IntroductionIn order to determine a theoretical performance forecast for a TBM drive at the design stage, the entire tunnelling process is divided into partial elements and process activities. These include, at the interface to the ground, 1:1 measurements of disc forces and in the future also the minidisc cutting test newly developed at the Montanuniversität Leoben. Final statements to forecast the performance are, however, first possible based on knowledge of the in-situ stress conditions, the prevailing geological and hydrogeological conditions in interaction with the tools used and the tunnel boring machine -in other words, through tests during the construction phase. Performance-relevant parameters in TBM tunnellingState of the technology 2.1 OverviewThe resulting advance rate is determined by the interaction of geological, mechanical and process-technical and construction operational factors. The cutterhead penetration is defined as the average advance into a rock or rock mass for one single rotation of the cutterhead [1]. The penetration in collaboration with the disc track spacing greatly determines the formation of fractures in the rock while boring solid rock. With decreasing size of the chips and increasing fines content in the muck, the danger of wear and clogging increase, and this is worsened by insufficient material transport. In cohesive soils, cutting wheels with a EinleitungZur Ermittlung der theoretischen Leistungsprognose eines TVM-Vortriebs im Planungsstadium wird der gesamte Vortriebsprozess in Teilelemente und Prozessabläufe untergliedert. Hierzu gehören an der Schnittstelle zum Baugrund auch 1:1-Diskenkraftmessungen sowie zukünftig u. U. ein an der Montanuniversität Leoben neu entwickelter Minidiskenschneidversuch. Endgültige Aussagen zur Leistungsprognose sind i.d.R. aber erst auf Basis der in situ vorherrschenden Spannungsverhältnisse, der anstehenden geologischen und hydrogeologischen Verhältnisse in Wechselwirkung mit dem eingesetzten Werkzeug, der Tunnelvortriebsmaschine -also durch Versuche während der Bauausführung -möglich. R. Galler/D. Handke/M. Nolden · The determination of performance-and payment-relevant parameters in TBM tunnelling -State of the technology and outlook small degree of opening tend to clog. With the danger of clogging, the wear also increases, and is worsened by insufficient material transport from the face.