Ground movements induced by Earth-Pressure Balanced, Slurry Shield and Compressed-Air tunneling techniques on the Toulouse subway line B

摘要

A global comparison of the effects of different tunneling techniques (Earth-Pressure Balanced Shield, Slurry Shield and Compressed-Air) on ground movements and strain in the tunnel lining segments is performed through the analysis of the results of three monitoring sections installed during the excavation works of Toulouse subway line B. The comparison is justified by the homogeneous geology of the site and the almost constant depth of the tunnel. Tunneling parameters such as the confining pressure, the grouting pressure and volume of grout injected are considered in the analysis.