Tunnel description Hindhead Tunnel



panorama seen northern viewpoint.



open day 14 may 2011



the old a3 being returned nature. view taken close gibbet hill, directly above tunnel. october 2012




in order meet predicted traffic capacity, each tunnel required 7.3 metres (24 ft) wide carriageway 5.03 m (16.5 ft) high traffic gauge , 1.2 m (3 ft 11 in) wide verges on either side. in addition 250 mm (9.8 inches) area had left above traffic gauge protect overhead equipment loose ropes, tarpaulins , like.


the tunnel excavated using mechanical diggers rather tunnel boring machine (tbm) tbm have been cheaper if tunnel longer 2.5 km (1.6 miles). result, excavated part of tunnel horse-shoe in shape rather circular, , amount of spoil removed 20% less have been case had tbm been used. each tunnel has approximate excavated diameter of 11.6 m (38 ft). 200 mm (8 inches) shotcrete primary lining provided initial support tunnel. @ southern end, tunneling passed through lower hythe sands, primary lining supplemented 4 m (13 ft) pins provide more support.


emergency interconnecting cross passages located @ intervals of 100 m (330 ft) facilitate movement of pedestrians between tunnels in case of emergency.


ancillary works include deep cutting south of tunnel new junction hindhead , hammer @ southern end. equestrian , pedestrian bridge, miss james bridge, crosses cutting between tunnel , junction, , includes heathland planting link habitats on either side of cutting.








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