LAGUNA-LBNO at Fréjus General Meeting June 2013, Geneva Giovanni Como, Francesco Amberg, Daniele Bronzetti 1

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Contents Resume of the situation Issues from TB meeting May, 15 th – 17 th 2013 in Paris  Alignment of the caverns CERN – Fréjus  Seismic risk  Sprayed waterproofing membrane  Fastening of the photomultiplier panels Open aspects  Possible optimization and solutions  Procedures for construction permits  Water supply  Next steps 2

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 December 2012 (Official announcement January 2013): decision to open the safety tunnel to the road traffic (direction Italy to France). This decision, according to Lombardi SA, could present some technical difficulties in the management of the Laguna building site. Alternative solutions Fréjus - Resume of the situation 3

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 >1700 m rock overburden LSM Underground Laboratory Modane Railway tunnel ( ) Longitudinal section (Road tunnel) 6,2 km 12.8 km 6,6 km Road tunnel ( ) Fréjus - Resume of the situation

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Excavation cross section ≈ 70 m 2 The ventilation system during the new access tunnel construction will be according to the AFTES 2003 recommendations (fresh air intake by separate duct and exhaust air aspiration at front face) Fréjus - Resume of the situation 5

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Exhaust air duct ≈ 12 m 2 Free section (fresh air) ≈ 40 m 2 Final free shape for by-directional traffic or over-size transports The upper air duct can be used as a smoke extraction facility (necessary considering the length of the tunnel – 7 km) The main necessity linked to the cross section definition is related to the ventilation of the Laguna building site (in particular the tanks construction phase) according to AFTES recommendations. Max fresh air volume needed = 200 m 3 /s Max speed of fresh air in the tunnel = 5 m/s Max speed of exhaust air = 20 m/s Fréjus - Resume of the situation 6

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Alignment of the caverns CERN - Fréjus Cern Fréjus 7

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Alignment of the caverns CERN - Fréjus Caverns orientation: 100 m Flow 8

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Seismic risk (NTC 2008): Fréjus Seismic risk 9

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Seismic risk Seismic risk (NTC 2008): Lower-middle seismic area a g = 0.136g 10

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Sprayed waterproofing membrane Waterproofing: normal solution in the tunnel construction GFK-Anker Outer lining: sprayed concrete Waterproofing membrane Inner lining: casted concrete Rock In LAGUNA- LBNO caverns additional inner lining in stainless steel 11

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Sprayed waterproofing membrane Waterproofing: Alternative solution GFK-Anker Outer lining: sprayed concrete Waterproofing membrane Inner lining: casted concrete Rock SPRAYED MEMBRANE 12

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Sprayed waterproofing membrane APPLICATION OF SPRAYED WATERPROOFING MEMBRANE INSTEAD OF STAINLESS STEEL INNER LINING 13

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Sprayed waterproofing membrane Accessible surface Joint Structure of the membrane (total thickness 3-5 mm): - Preparation layer - Accomodation layer - Waterproofing layer - UV-Protection layer Adherence on the whole surface > 1.5 N/mm2 without water circ. Freezing forces taken from accommodation layer Deformation and joint movements may be absorbed : -Breakpoint extension 1’500 % - Breakpoint stress 60 N/mm2 Joint to rock or different materials 14

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Sprayed waterproofing membrane 15

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Sprayed waterproofing membrane APPLICATION OF SPRAYED WATERPROOFING MEMBRANE INSTEAD OF STAINLESS STEEL INNER LINING Contact with suppliers: BASF, Mapei, ISO Permaproof AG New problem: normally water pressure from outside and not from inside Solution feasible: water pressure: no problem Colours of the membrane theoretically free (white) By all suppliers: very good radon barrier: data should be delivered soon Mapei: ev. Additional mortar layer with TiO 2 paint (problems?) Open questions: reflexion capability ev. No Tyvek? 16

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Sprayed waterproofing membrane 17

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Fastening of the photomultiplier panels Yann Colaitis – APC Laboratory Support structure: Technodyne International Ltd. T-profile L-profile 18

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Fastening of the photomultiplier panels Support structure: Technodyne International Ltd. Theoretically only one support for all the height. One L-profile holds ~20 tons. Technodyne International Ltd. 2.4 m 19

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Fastening of the photomultiplier panels Support structure: In the praxis more support points and horizontal stability elements. Technodyne International Ltd. Horizontal stability elements Technodyne International Ltd. 20

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Open questions Possible optimizations and solutions: Access layout Single tunnel or double tunnel (main tunnel + technical tunnel) Alternative access for the Laguna Building Site New access tunnel cross section: reasons and assumptions Possible optimization and solutions Unanswered questions Other technical issues 21

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Open questions Possible optimizations and solutions: Single tunnel or double tunnel (main tunnel + technical and safety tunnel) Alternative access for the Laguna Building Site New access tunnel cross section: reasons and assumptions Possible optimization and solutions Unanswered questions Other technical issues Cm 81  2' m 2 22

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Open questions Possible optimizations and solutions: New access tunnel cross section:  Analysis of fresh air need in function of work advance  Maximal time for complete air change in both caverns  Radon load  Possibilities to reduce volume to be ventilated  Safety aspects during construction 23

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Open questions Possible optimizations and solutions: New access tunnel cross section:  Analysis of fresh air need in function of work advance  Maximal time for complete air change in both tanks  Radon load  Possibilities to reduce volume to be ventilated  Safety aspects during construction 24

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Open questions Construction permission: procedures to be cleared soon Water supply: contacts with Val Susa authorities should be take over next. Preliminary contacts have already been undertaken. 25

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Fréjus Construction permission Procedure: Submission of the form for the construction permission to the municipality Publication of the construction request (3 months) In case of no opposition, the request will be allowed In case of opposition, the request can be refused ( 26

LAGUNA-LBNO at Fréjus – General Meeting, Geneva, 10 – 12 June 2013 Detail study of ventilation requirements in function of excavation stage Optimization of the tunnel access tunnel cross section after answers to the actual and future technical questions Evaluation of the possible solutions one / two access tunnels(s) Safety aspects Technical aspects sprayed waterproofing membrane Cost estimation after answers to the actual and future technical questions Fréjus – Next steps 27