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EXAMINATION OF EXCAVATION CHAMBER PRESSURE ON A 17.5 M DIAMETER EARTH PRESSURE BALANCE TUNNEL BORING MACHINE (2015)
This paper examines excavation chamber pressure behavior within a 17.5 m diameter earth pressure balance tunnel boring machine (EPBM) used on the Alaskan Way viaduct replacement tunnel project in Seattle, Washington, USA. The study examines behavior during the first 150 rings of tunneling (10% of the project) through till and till-like deposits, granular soils, and cohesive silts and clays. Machine data, including excavation chamber pressures, screw conveyor pressures, soil conditioning inputs, and key operating parameters such as thrust, cutterhead and screw conveyor torque, cutterhead and screw conveyor rotation speeds, etc., were studied in detail to determine what parameters influenced chamber pressures and how. The results of detailed EPBM data analysis supported with field lab test results from muck testing produced a number of key findings.
International Conference on Tunnel Boring Machines in Difficult Grounds (TBM DiGs), Singapore, 18–20 November 2015
The Robbins Company, Seattle, WA, USA