TUNNEL CONSTRUCTION.

Keywords: THAMES WATER UTILITIES, J MURPHY, WATER, RINGS, MAINS, RING, TUNNELS, CONSTRUCTION, TRANSFER, SHIELDS, BORING, MACHINERY, SOFT, GROUND, TUNNELLING, METHODS, LININGS, TBM, GEOLOGY, CLAYS, LONDON CLAY, WOOLWICH BEDS, READING BEDS, SELECTION, WEDGEBLOCK, BACKHOES, LOGISTICS, DRIVING, SAFETY, EPBM, EARTH, PRESSURE, BALANCE, MACHINES, CITIES, SUPPLY, WATER SUPPLY, THAMES, LONDON, UK