INGENIEUR
concrete structures especially
the plastic concrete cut-off
wall and cement grout curtain.
Questions were raised on the
allowable limits of vibration
caused by quarry operation and
the potential impact on the dam
under construction.
The blasting design of Weng
Lee quarry allowed maximum
instantaneous charge up to
640 kg. Based on the method
of analysis in Canada (Report
on Blasting Impact Assessment
for Nelson Quarry Extension,
April 2006), the peak particle
velocit y (PP V ) generated
from the existing quarry was
estimated to be 58.5 mm/s and
17.4 mm/s for buffer distance
of 200m and 500m. Both DOE
Guideline (2007) and United
States Office of Surface Mining
recommend the safe limit for
the peak particle velocity of 12
mm/s. A minimum buffer 500m
is required in order to meet the
safe limit of PPV.
The resolution of the quarry
issu