“CUT AND COVER” TUNNEL OF LINE 3 RIYADH METRO

Name and location

Cut and cover tunnel on Line 3 of the Riyadh Metro (Riyadh, Saudi Arabia).

Key features

3J1 Tunnel

  • Length: 1400 meters
  • Maximum depth: 26 meters
  • Materials: reinforced concrete
  • Construction: cut and cover tunneling method

3J2 Tunnel

  • Length: 600 meters
  • Maximum depth: 13 meters
  • Materials: reinforced concrete
  • Construction: cut and cover tunneling method

3K1 Tunnel

  • Length: 1200 meters
  • Maximum depth: 14 meters
  • Materials: reinforced concrete

Property

High Commission for the Development of Arriyadh

Construcción

Consorcio ANM (ArRiyadh New Mobility)
2016-2017

BT Intervention

Design both temporary works and permanent works for the ramps to access the transfer stations 3J1, 3J2 and 3K1.

Description
Drawings

Description

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The Riyadh metro will be about 180km long with six lines and 85 stations, including underground, elevated and at-grade sections. Line 3 will be the longest line of the metro, at 42km, running east-west and includes 22 stations.

BT work consisted in designing both temporary works and permanent works for the ramps necessary to access the transfer stations 3J1, 3J2 and 3K1.

The excavation is carried out by using a bottom-up method. For the shallow stretches of the ramp, an open excavation is possible without requiring temporary works and for deeper stretches, temporary works are needed.

The retaining system is constituted by pile walls or micropile walls. The maximum excavation level is reached by supporting the retaining walls with temporary steel struts and anchors. Then, the permanent structures (bottom slab, permanent walls, roof slab) are built starting from the bottom.

Drawings

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Geometrical Definition

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Cross sections

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Construction Process outlines

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Cross Section Reinforcement

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