Evaluating D&B and TBM tunnelling using NTNU prediction models |
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| Affiliation: | 1. Department of Mining, Petroleum and Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran;2. Department of Civil and Transport Engineering, Norwegian University of Science and Technology, NTNU, Trondheim, Norway;3. Department of Mining Engineering, Earth Mechanics Institute, Colorado School of Mines, Golden, CO, USA;1. Pamukkale University, Engineering Faculty, Geological Engineering Department, Denizli, Turkey;2. Pamukkale University, Engineering Faculty, Civil Engineering Department, Denizli, Turkey;1. Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Architecture, Civil and Environmental Engineering, Laboratory of Rock Mechanics (LMR), Lausanne, Switzerland;2. Department of Civil Engineering, Monash University, Melbourne, Victoria 3800, Australia;1. Istanbul Medeniyet University, Civil Eng. Dept., Goztepe, Istanbul, Turkey;2. Istanbul Technical University, Mining Eng. Dept., 34469 Maslak, Istanbul, Turkey |
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| Abstract: | Drill and Blast (D&B) and Tunnel Boring Machine (TBM) are the two dominating excavation methods in hard rock tunnelling. Selection of the cost effective excavation method for a tunnel is a function of tunnel cross section area, rock conditions, tunnel length, availability of skilled labour and proper equipment, and project schedule. Over the past few decades, major technological development and technical advances have been achieved in both methods. Yet, in many tunnelling projects, choosing the excavation method is still a challenge and requires considering pros and cons of each method and estimating construction time, costs, as well as post construction and operation & maintenance, and related risk in the planning phase. In this study, the productivity and efficiency of the D&B and TBM options for excavating certain size tunnels have been examined. The analysis is based on recent NTNU prediction models for advance rate and unit excavation cost for given ground conditions and tunnel geometry. For excavation of large size tunnels in very hard rock, the D&B method seems to be the cost effective choice irrespective to tunnel geometry. This is compared to smaller long tunnels with good boreability were the TBM has higher advance rate. The tunnel size and rock conditions have higher impact on the TBM performance and costs than for D&B. This refers to lower risk of using D&B where the use of this method is otherwise justified. |
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| Keywords: | TBM tunnelling Drill and blast tunnelling Excavation time and costs |
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