1. Progress on tunnel cross-section options
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1. Progress on tunnel cross-section options 2. A simplified model for the cost of a “smooth” tunnel excavated by TBM in sedimentary rock. Ph. Lebrun & J. Osborne 5 th FCC Infrastructure & Operation meeting CERN, 28 May 2014. Single tunnel, longitudinal ventilation Revised.

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1. Progress on tunnel cross-section options2. A simplified model for the cost of a “smooth” tunnel excavated by TBM in sedimentary rock

Ph. Lebrun & J. Osborne

5th FCC Infrastructure & Operation meeting

CERN, 28 May 2014


Single tunnel longitudinal ventilation revised
Single tunnel, longitudinal ventilationRevised

FCC I&O meeting 140528


Double tunnel revised
Double tunnelRevised

FCC I&O meeting 140528


Single tunnel transverse ventilation to be revised with ventilation duct cross sections
Single tunnel, transverse ventilationTo be revised with ventilation duct cross-sections

FCC I&O meeting, 140326


Tunnel cost model a word of caution
Tunnel cost model: aword of caution

  • The simplified cost model presented here is based on the study performed by Amberg Engineering for the CLIC CDR cost estimate

  • Strictly valid for hard-rock TBM tunnelling in the molasse of the Geneva basin, it is based on a set of unit costs applicable to geology, depth below ground, tunnel size and configuration, excavation equipment, rock support, lining and sealing techniques, progress rates, personnel, materials, transport and handling

  • Consequently, the model should not be used for estimating tunnel costs outside its range of validity

  • It is recommended to use output results for relative cost comparison rather than absolute cost assessment

FCC I&O meeting 140528


Clic 3 tev tunnel profile
CLIC 3 TeV tunnel profile

FCC I&O meeting 140528


Clic tunnel cross section
CLIC tunnel cross-section

FCC I&O meeting 140528



Methodology of amberg study for clic underground works 1 2
Methodology of Amberg studyfor CLIC underground works [1/2]

  • Standard profiles were developed for each underground structure, including details on the excavated cross sections as well as the inner lining. For each of these standard profiles, the following main items are evaluated in quantity and price:

    • Labour for workmanship like workers and foremen (below senior level)(shift work system: 3 shifts working 24 h/day, 7 days/week, 320 days/year , rest: official holidays and maintenance)

    • Tunnel excavation with shielded TBM and single-pass pre-cast concrete lining, mucking and disposal

    • Rock support for caverns by means of rock bolts with steel-fibre shotcrete

    • Full sealing of the caverns and halls, as well as collecting and diverting of dropping water in the remaining structures

    • Inner lining considered with reinforced concrete

    • Implementation of an invert with sufficient bearing capacity to withstand the probable swelling pressure of the present Molasse

    • Connection works to the neighbouring contracts

FCC I&O meeting 140528


Methodology of amberg study for clic underground works 2 2
Methodology of Ambergstudyfor CLIC underground works [2/2]

  • The previously listed main items cover basically 55 – 65 % of the final costs. Given the preliminary phase of the study, some further costing positions were added to the main items as percentage surcharge of the subtotal:

    • Drainage including the pumping stations at the shaft bases (4%)

    • Quality control (2%)

    • Auxiliary measures (15%) such as pre-investigations, pre-injections, ground improvement

    • Installations and equipment for construction works (e.g.: TBM, excavators, cranes, lorries) (30-40%)

    • Overhead (15.9%) (according to the calculation scheme of Swiss Contractor Ass.) including:- surcharges on hourly wagese.g. for shift works 24 h/day and 7 days/week, workmen’s equipment, recruiting and training,- maintenance and operation of the workshops and site installations,- senior personnel for management and surveillance, - administration costs and interest rates,- insurance and contributions

FCC I&O meeting 140528


Amberg study for clic underground works
Amberg study for CLIC underground works

FCC I&O meeting 140528


Simplified cost model of tbm excavated tunnel
Simplified cost model of TBM excavated tunnel

  • Specified free diameter D

  • Excavated diameter Dexc = D + 2 (tolerance + lining thickness+ grouting thickness)

  • Cost per meter C = C1 + C2 + C3 + C4 + C5

  • C1 fixed cost per meter (e.g. TBM personnel for given progress rate)

  • C2 proportional to excavated volume ~ Dexc2

  • C3 proportional to lining & grouting volumes ~ Dexc

  • C4 proportional to invert (floor) volume

  • C5 cost per meter of additional construction elements (partitions, firewall)

     Cost per meter of finished tunnel is expected to scale between D and D2

FCC I&O meeting 140528


Excel table a ll dimensions and unit costs adjustable
EXCEL tableAll dimensions and unit costs adjustable

FCC I&O meeting 140528


Cost of tunnel vs finished diameter tbm in sedimentary rock no additional construction
Cost of tunnel vs finished diameter(TBM in sedimentary rock, no additional construction)

FCC I&O meeting 140528


Cost structure of tunnel tbm in sedimentary rock no additional construction
Cost structure of tunnel(TBM in sedimentary rock, no additional construction)

FCC I&O meeting 140528


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