The Chiltern Tunnel South Portal Headwall has been designed to provide a subvertical face for the launch of the TBMs, having an approximate retained height of 20m. The face was designed to have an angle of 70 degrees above the tunnel crown, through 6 m of structureless chalk and drift deposits, and 80 degrees below the tunnel crown a further height of 14m. The subvertical face is essential to enable the beginning of the bore.
The South Portal structure is part of the wider South Cutting works, and interfaces with the Chiltern Tunnel at the headwall location. The tunnel portal extends South East for approximately 230m towards the Colne Valley Viaduct.
Tunnelling completed on Grand Paris Express’ Line 15 South
Grand Paris Express project promoter Société du Grand Paris has reached a major milestone on the construction of its Line 15 South with the final tunnelling breakthrough on the route.
Herrenknecht tunnel boring machine (TBM) Ellen broke through into the station box at Arcueil-Cachan earlier this month after a four month drive to take the 900m long tunnel below the Bagneux and Cachan districts of Paris.
Line 15 is one of four new metros lines being developed by Société du Grand Paris on the Grand Paris Express project. The work has been split into a number of contracts and Line 15 is being undertaken by contracting joint venture CAP group, which is led by Vinci Construction.
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