Abstract
AbstractRing line no.15 is one of four new metro lines of the Grand Paris Express mega‐project. The construction lot T2C in the southeast of Paris with a length of approx. 7 km is a key part of the new line. It consists of a 4.7 km long tunnel between Noisy‐Champs and Champigny, a 2.2 km long bypass tunnel with a maintenance station, a large‐scale underground junction cavern, and intermediate access shafts. Difficult ground conditions, limited space for construction, and the requirement for minimization of settlements in an urban environment determine the ground control systems for this tunnel project. Among others, the AT – 139 pipe umbrella system with press connection and a wall thickness of 8 mm, foot piles from the DSI hollow bar system as well as GRP face anchors were used. (photo: DSI Underground)
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