Abstract
A water pressure tunnelling method described is intended for use in driving tunnels in loose, subaqueous, sandy soil. The method allows safe and accurate tunnel excavation at normal speed without adverse effect on buildings even under unstable ground conditions. With this method soil excavated by the rotation of the disc of a shield machine is taken into the cutter frame and stored. The soil is compressed and transported backwards by the rotation of the screw conveyor. Earth pressure is generated to contain the earth pressure at the cutting face. Excavated soil is turned into a slurry for easy transport and discharge outside the tunnel. The tail void created by the movement of the shield can be filled by synchronous back-filling. Projects are described in which the tunnelling method was used in Tokyo on tunnels ranging from 1976-5240 mm diameter in complex soil composed of silt and gravel layers. (TRRL)
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