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Date
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14 MARCH 2012
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Time
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18:00 - 20:00
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Event Type
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Lecture
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Refreshments served at 18.00 and the talk will start at 18.30. Talks usually last approximately one hour with time at the end for questions.
The A3 Hindhead project completed the dual carriageway link between London and Portsmouth and removed a major source of congestion, particularly around the A3/A287 traffic signal controlled crossroads. The new road is 6.5km long and includes 1.83km twin bored tunnels under the Devil's Punch Bowl Site of Special Scientific Interest. The southbound tunnel was opened to traffic on 27 July 2011and the northbound on 29 July 2011.
The project now delivers quicker, more reliable journeys on a safer road, and removes much of the previous peak time traffic from unsuitable country roads around Hindhead. It includes the closure of the existing A3 around the Devil's Punch Bowl, bringing considerable environmental benefits to an internationally prized area. The centre of Hindhead has been freed from the daily gridlock that blighted the area, with the result that the project benefits road users, local residents and the highly prized environment.
The tunnel is 1.83km long comprising about 1.77km of bored tunnel and approximately 30 metres of cut and cover at either end. The maximum depth of tunnel below ground is about 65m at Gibbet Hill, (measured to the top of the tunnel). The tunnel bores are approximately parallel and linked by pedestrian cross-passages at approximately every 100m throughout the tunnel. The tunnelling method used by Balfour Beatty was the Sprayed Concrete Lining method (SCL).
The tunnel alignment is in the middle of the Upper Hythe beds at the southern portal. These beds consist of silt sand with rock bands. Further north, it passes through the Upper Hythe beds where the percentage of rock starts to increase and then in the Lower Hythe beds there is rock with minor sand bands.
(Project summary adapted from Highways Agency)
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