PROJECT: BUNGUS - PENGAMBIRAN TUNNEL, PADANG
| Description: | Feasibility study of the Bungus - Pengambiran Tunnel |
| Client: | Municipality of Padang, Indonesia |
| Contact person: | ir. M.H.A. Brugman (M.Sc.) |
In order to increase the accessibility of freight transport by road to the hinterland, the Indonesian government has requested to construct a tunnel trough the mountainous area south of the city of Padang situated on the island of Sumatra (see map). The expected traffic growth will to a certain extent be caused by the planned expansion of the Teluk Bayur sea harbour.
A Dutch - German consortium, which includes Witteveen+Bos, Strukton, Maidl + Maidl and Arthe, performed a feasibility study for different aspects of the tunnel. The project's budget is carried half by the Ministry of Finance, while the remaining half is carried by the consortium partners.
The various construction activities are divided among the consortium partners. Within the consortium, Arthe designed the tunnel portals. In combination with Strukton, Arthe performed the risk analysis, compiled the planning, and calculated the estimated cost price.
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The tunnel portals provide a safe working area for the personnel during tunnel construction. When the tunnel is finished, the traffic will also be protected against land slides and rock fall. Moreover, the tunnel portals create a wall that helps the TBM (Tunnel Boring Machine) to start excavating the tunnel trough the mountain. In order to support the TBM, a concrete shield cradle is placed in the tunnel.
The earth pressure on the tunnel portals are analysed by means of a PLAXIS model, which has resulted in a required construction having steel beams with reinforced shotcrete between them. The shield cradle was calculated with the help of ESA PT.
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