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Your thoughts on blast vibrations.
I know I said I wouldn’t blog again but this is pretty interesting. I am looking at bidding for a contract for an 8 level basement in argillite rock in the centre of Brisbane. This will be the deepest basement ever built in Brisbane is quite ambitious.
I have two problems:
- The site is surrounded by heritage structures and the Riverside Expressway which have vibration limits of 5 mm/s.
Aerial View of Queens Wharf Development
The shiny structure is Queen’s Wharf – you can see why blasting rock may be an issue.
2. I did an excavatability assessment and nearly the whole thing needs blasting.
Excavatability Assessement (GSI vertical axis and Reduced Level horizontal axis)
Site map and boreholes GB27-GB35 are missing!
The less permissable vibration the greater the cost (see below). The arguments for the 5mm/s limit come from a german code (the most stringent). I need to produce a paper to argue with ARUP that this vibration limit can be increased. There is about $3 M AUD in savings if I can increase or mitigate the vibrations. Any thoughts?
Some useful background reading.
200281_ Selection of Blasting Limits for Quarries and Civil and Construction
Holdfast Training Services Trial Blog 