The 35-storey building has been designed by Singapore’s Surbana Consultant Pte Ltd to reflect Abu Dhabi’s maritime heritage. The foundation required deep excavation, for which monitoring instruments were important.
Encardio-rite’s sister concern Encardio-rite Geosystems LLC in UAE was awarded I&M sub-contract for the monitoring works. The scope of monitoring works included
- Supply, installation, monitoring of geotechnical instruments
- Weekly and monthly monitoring report submissions.
Good amount of monitoring instruments were used to protect adjacent structures as well as ground movements due to deep excavation works. To avoid any ground movement and deflection of wall, three layers of strutting scheme was designed.
The instruments involved in monitoring works included
- Inclinometers were used to monitor lateral movement in ground and in diaphragm wall
- Compression load cells were used at around 2.5 m from waler beam on pipe strut to monitor load on struts
- Spot weldable strain gages were used on all the three layers of struts to monitor stress
- Piezometers were used outside the diaphragm wall to monitor the groundwater pressures
- Open standpipe were used to monitor groundwater level within excavation area
- Tilt meters (plates with portable readout system) were used on adjacent structures within the zone of influence to monitor any deflection caused by excavation works
- Crack gages were used on adjacent structures within the zone of influence to monitor any existing critical crack
- Vibration and noise recorder were used to check whether the vibration caused with excavation equipments were within allowed limits.