ABSTRACT
In the rapidly developing Emirate of Dubai, the Dubai Strategic Sewerage Tunnel (DSST) Project will upgrade the existing sewage infrastructure from a pumped system to a gravity-based system. The project will include almost 250 km of link sewer, approximately 82 km of tunnels with inside diameters ranging from 3.5 to 6.5 meters, and two terminal pump station shafts with diameters of 43 meters and 63 meters. The general subsurface conditions are surficial sands underlain by cemented calcareous sand and weak rock, with groundwater near ground surface. Preliminary design was performed for the largest diameter pump station shaft final liner and invert slab, and tunnel liner. Additional analyses include a cylindrical buckling and uplift evaluation of the final shaft structure under computed loads.
