Vibration control blast

For the Mining Industry there are two main aspects with regard to vibration and airblast:

•    Firstly - standard compliance monitoring

This can generally be solved using standard charge weight scaling laws and, if required, simple Fourier analysis to extract general frequency content. We can assist you in case you have exceedence issues.

•    Secondly - protection of sensitive structures in mines

Unfortunately, this CANNOT be solved using the standard techniques of compliance monitoring. It requires modern methods that go well beyond charge weight scaling and simple Fourier approaches. These modern approaches include waveform modeling methods (such as Monte Carlo superposition models), time-frequency methods (to track how the frequencies change with time during a blast), and empirical mode decomposition (EMD) methods (which indicates HOW the structure shakes in its various modes). A knowledge of these aspects is crucial in understanding the impact of either airblast or vibration.

Airblast by overpressure blasting control

Air piston models (for airblast) where a blast can be initiated from multiple points to steer away from the points of interest:

In other words, these modern approaches are the diagnostic tools required to minimise any blast vibration impacts on structures. The waveform superposition and air piston models also provide a very powerful addition to standard compliance monitoring

Unfortunately, all these modern approaches are not in the standard toolkit of vibration/airblast consultants. MOS, in association with Blasting Geotechnics (http://www.bgpl.com.au/) and SAROS (http://www.saros.com.au/) can assist you to control these exceedances.

MOS has arrangements with skilful personal and access to high-resolution instrumentation to assist you to solve exceedances either for compliance or on important structures.

Fume reduction blasting

Of late fume, has been a challenge for the mining industry. Carefully designed and implemented blasts by choosing the right product for the situation have proven to produce less fume. MOS has had mixed success and would like to assist you with fume reduction blast designs.

Dust control blast

MOS can assist by carefully modelling the wind direction at the time of firing and channelling dust away from townships.