Why do you have to blast rock?
Blasting is generally the most cost effective method for breaking
rock. Mechanical breaking, such as ripping with big bulldozers and/or
hoe ramming, can be very time consuming and costly. The cost can
run as much as 5 to 10 times higher than blasting.
The end result of blasting is much more cost effective. The life
of the project is shortened and inconvenience to surrounding neighbors
is minimized.
What prevents damage to my house or my well
when blasting is nearby?
Most projects are governed by local, state and federal regulations.
These governing agencies have set limits on the level of vibration
and the noise produced by blasting so that damage is not incurred
on a nearby well or structure.
Who determines the
levels of ground vibration and air blast that are safe
for my home?
The U.S. Bureau of Mines has done much research in this area and
has contributed a major part of the technical data on blast design
and control. Other agencies, institutions, and individual investigators
have contributed to the accumulated knowledge in this area.
The current legal and recommended vibration limits result from
this research. By complying with these limits and following safe
blasting procedures, the risks to the surrounding area are minimized
and even eliminated.
There are many reports in published findings on this subject.
One good resource is the book The Effects of Vibrations and Environmental
Forces, authored by Lewis L. Oriard and published by the International
Society of Explosives Engineers.
How is ground vibration and
air blast measured?
Instruments called seismographs are used to accurately measure
ground vibration and air blast (air over pressure).
Most blasting companies are required by law or by their insurance
company to keep accurate records for each blast detonated. The
analyzed seismic recordings together with the blast records can
be used by consulting firms or insurance companies to predict vibration
levels other than those where the recordings were taken.
What is a preblast survey?
In some instances, homeowners living near a blasting
project will be given an opportunity to have their homes inspected
before blasting starts. These inspections are generally offered
as a courtesy by the company doing the blasting.
They consist of detailed descriptions of the conditions observed
by the inspector such as your home. This is usually done by written
documentation, photographs, video tape or by a combination of these
methods.
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