A NEW SHIELD SUITABLE FOR LARGE-SECTION LONG-DISTANCE TUNNELING

Abstract

The length of shield tunneling has been on the increasei nrecent years, and long-distancetunneling with a large-section shield exceeding 10 mindiameter is likely to increase inthe near future. Taking advantage of the fact that a large cross section is involved, the auth ors have developed an eccentric multi-axis shield tunneling machine that has six fan-shaped cutters. Each cutter has its own drive system and is capable of being retracted into a housing that has the same shape as the cutterhead located in the shield.
This paper reports on a three-dimensional flow analysis of slurry in the chamber and shows that use of segmental cutters improves flow.