DISCUSSION. THE DARTFORD TUNNEL.

Keywords: TUNNELS, PILOT, BOREHOLES, GROUTING, TECHNIQUES, GROUTS, ALLUVIAL, TUBE A MANCHETTE, CLAYS, AIR, COMPRESSED, TUNNELLING, PRESSURE, RIVERS, BANKS, ROADWAYS, PRECASTING, PORTAL, SERVICES, VENTILATION, PLANT, UNDERWATER, WATERWAYS, LININGS, DESIGN, GROUND, CONDITIONS, TREATMENT, GRAVEL, SHIELDS, DARTFORD, THAMES, ESSEX, KENT, UK