107 Category 3: Industrial Buildings and Plants 3 Contact Tomfei Hainga, Michel Capron, Patrick Heck Address Avenue de cour, 61 1001 Lausanne, Switzerland Website www.bg-21.com BG is a Swiss engineering consulting company with an international outlook, which focusses on providing its clients with cutting-edge solutions for the development of a sustainable world. Its expertise covers various areas ranging from infrastructure, environment, and construction to energy, with particular focus on water and transportation. The BG Group currently employs over 600 people in Switzerland, France and Algeria. Founded in 1954, the BG Group celebrated its 60th anniversary last year with a new visual identity. Owner Nant de Drance SA Architect Nunatak sàrl General Contractor GMI (Groupement Marti – Implénia) Engineering Office BG Consulting Engineers SA Construction Period 2011 - 2017 The Nant de Drance pumped storage project is a hydroelectric power facility in Switzerland with a capacity of 900 MW. By 2019, it is forecast that this facility will produce 2500 GWh of peak energy per year. At 184 m long, 32 m wide and 52 m high, the main transformer cavern is a reinforced concrete structure, excavated in the rock. The first challenge was to identify the risk scenarios and the limit states, by analysing the cavern stability and the surrounding rock mass. The second was to reproduce the complex electromechanical forces in the model and apply them to the structure. The third was to respect the very strict deformation and stiffness criteria, which were imposed by the manufacturer. It was necessary to create several calculation models to analyze all these constraints. The 3D model provides an indication of the general behaviour of the structure and its reinforcement. Nonlinear calculation allows the cavern walls to be designed and reinforced. Multimodal calculation and time domain dynamic analysis allow us to understand the overall behaviour of the structure with regard to risks linked to operation of the machines. This publication addresses the analysis and design of the underground cavern structure in Nant de Drance project, by taking full advantage of the potential of SCIA Engineer numerical tool. Nant de Drance - Chamonix Aiguilles Rouges Massif, Switzerland SE BG Ingénieurs Conseils
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