General meeting LAGUNA LAGUNA – Fréjus site

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Presentation transcript:

General meeting LAGUNA LAGUNA – Fréjus site Geotechnical feasability (Rewiew of WP2 Munich January 26th-27th, 2009) March 30th.- April 2nd 2009, Wroclaw

CURRENT SITUATION: GENERAL PLAN LSM Underground Laboratory Modane Road tunnel Railway tunnel Longitudinal section >1500 m rock overburden 6,6 km 6,2 km 12.8 km

Geotechnical parameters of rock mass Unit weight 27 kN/m3 Elastic modulus 15 GPa Poisson’s ratio 0.2 Friction angle 35/40° (lower/mean value) Peak cohesion 3000 kPa Residual cohesion 2000 kPa (short term) 500-750 kPa (medium term) 200-300 kPa (long term) Plastic strain 0.5 % (for reach residual cohesion) Dilation angle 3°

Main characteristics of calc-schists Time-dependent behaviour of rock mass (displacements) Tendency to wedge instability on roof Anisotropy of rock mass properties (effect of schistosity) Reduction of rock mass strength after failure No water circulation in the rock mass (OK for cavern stability and thermal losses during reservoir operation)

Cavern design LENA 221'000 m3 GLACIER 320'000 m3 MEMPHYS 558'000 m3 21.9 17 m 41.9 19 m 47.5 110 m D=76 m 70 m 25 m D=67 m D=35 m

Memphys – 3D model (FLAC)

Memphys – Displacements – Long term

Memphys – Failure zone – Long term

Memphys – Analysis of wedge stability

Large excavations at Frejus - Conclusions The construction of the large excavations for the 3 detector types of Laguna is feasible at Frejus site. For Glacier it is possible to built a unique large tank. The division into 2 smaller tanks can reduce the total construction costs of the caverns. For Lena it is not necessary to have curved walls The final lining should be placed at least 2-3 months after the excavation in order to reduce the rock pressure in the long term (excavation from top to bottom, construction of final lining from bottom to top).

Interaction between tank and rock mass The stability of the rock mass during excavation is ensured by anchors and reinforced shotcrete The definitive cavern is sustained by a concrete lining. Glacier needs a inner, independent tank. The rock loads are supported by the concrete lining and will not be transferred on the steel tank. The water from the rock mass can cause an external load on the imperious tank (even if apparently the rock appears dry). To avoid this type of load, it is necessary to design an external drainage system. The earthquake is not a problem for the steel tank, if there is not an active fault crossing the cavern (atypical situation).

Location LAGUNA Safety tunnel Road tunnel LAGUNA Railway tunnel

LAYOUT (top view) Access Tunnel Safety Tunnel Road Tunnel Control room, offices, storage, power Safety Tunnel Electronics Air and water purification Electronics Road Tunnel Electronics

LAYOUT (side view) Safety Tunnel Road Tunnel Access Tunnel Air and water purification Safety Tunnel Road Tunnel Electronics Electronics Control room, offices, storage, power Access Tunnel

Air and water purification LAYOUT Access Tunnel Safety Tunnel Electronics Air and water purification Control room Storage Offices Power Electronics Cables, piping etc Electronics