Design and Construction Challenges in Urban Settings for the NATM Tunnels’ Line 2 of the Riyadh Metro

Synopsis:

The Riyadh Metro Project entails the construction of six new lines. ArRiyadh Development Authority, the executive arm of the High Commission for the Development of Arriyadh contracted BACS consortium to design and build Lines 1 and 2; Gall Zeidler Consultants designed mined tunnels which are sections of the tunnels for the Lines 1 and 2 including emergency egress shafts and connection adits. This paper describes design and construction of Line 2 mined tunnels in urban settings including challenges encountered during excavation in close proximity to the building foundations, piers and methods to control inflow of groundwater in ground conditions varying from disturbed brecciated to fresh intact limestone.

2018 North American Tunneling Conference Proceedings
June 24 – 27, 2018, Washington, D.C. (Pyakurel, S., Zeidler, K., Gerstgrasser, A., & Thomson, I.)
Copyright holds Society for Mining, Metallurgy & Exploration (SME). Full proceedings volumes can be found on website at www.smenet.org.