The contract work involves dewatering an excavation for a multi-storey basement of a proposed mixed development. The dewatering has been operational for over 17 years. The excavation is roughly a square shape with a plan size of 353 m by 350 m with a total perimeter length of approximately 1,432 m. Dewatering design is for a maximum formation level of -15.7 m DMD. Side support is by contiguous piles.
WJ drilled and installed over 80 deepwells on the perimeter and across the site, then later reduced after completion of some buildings.
WJ designed the dewatering system with the aid of 3D numerical groundwater modelling for sensitive neighboring Dubai Metro. Telemetry system is currently in use for remote monitoring the dewatering pumps along with the electrical parameters.
This dewatering system is interesting as the deepwells are located all outside the excavation and shoring. The dewatering system was carefully designed by WJ to benefit from the contiguous piles to achieve dewatering internally to remove obstructions from the site.
The site is adjacent to the Metro line at Sheikh Zayed Road, so careful dewatering is key.
The dewatering system along the North East in front of Hotel Ibis has been converted to a semi-permanent system, with buried HDPE headermain and power cables. Each pump is located within a concrete manhole to keep out of sight of public.
The dewatering valuation is currently over AED 15M. The dewatering commenced in 2007 and is still ongoing.
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