Chemical Grouting for Paris Rapid Transit Tunnels

by Jean J. Janin, Manager, Head of Grouting Div.; Soletanche, S.A., Paris, France,
Guy F. Le Sciellour, Asst. Mgr.; Head of Foreign Operation Div., Soletanche, S.A., Paris, France,

Serial Information: Journal of the Construction Division, 1970, Vol. 96, Issue 1, Pg. 61-74

Document Type: Journal Paper


The construction of subsurface structures for a new rapid transit railway line in a major, crowed city like Paris created special problems. The 30-ft diam tunnel runs below GWL through sands and gravels, underneath existing structures. A shield and mole are used for the excavation. Consolidation of soils is provided by chemical grouting. This technique is also used to consolidate the foundations of a bridge, over the tunnel, when crossing the Seine. A major station, 750 ft long, 130 ft wide, 60 ft high, is excavated in difficult geological conditions complicated by existing services, railway tunnels in operation, and buildings. Silicate and resin grouting provide the consolidation without recourse to compressed air or dewatering. A classification of modern chemical grouts is given with their limits of injectability. Elaborate grouting procedures prove their efficiency in supplementing or replacing modern tunneling methods when grouting is thought of, at the right time, as a reliable construction procedure.

Subject Headings: Chemical grouting | Rail transportation | Consolidated soils | Rapid transit systems | Tunnels | Existing buildings | Excavation | Bridge foundations | Paris | France | Europe

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