11
Placement
Method
Instructions
Bury
Transducer
in Soil
This is the most accepted procedure and will produce the most dependable
results. For more information about this procedure, refer to the U.S. Bureau of
Mines Bulletin RI 8506
–
Measurement of Blast Induced Ground Vibrations
and Seismograph Calibration.
1.
For most blasting operations (vibration readings less than 1.0 ips, 25.4
mm/s), bury the transducer block in the soil with the top of the block level
with the surface of the ground.
2.
To add further coupling that will make the block more secure, place the
spike on the transducer block and spike it in the bottom of the hole in which
the transducer is placed.
3.
Fill the hole with soil and pack it tightly around the transducer block.
4.
Apply slight force to the transducer block to see if it is secure enough
–
if
it moves at all, the soil is not packed tightly enough around it.
For larger vibration recordings (in excess of 1.0 ips, 25.4 mm/s), consider
burying the transducer block deeper. For best results, place the transducer
block in a hole that is at least 6 inches deep and pack the soil on top of the
