Blasting Damage

Rock Blasting

Rock blasting causes damage that can be classified as a variety of things

• Fly Rock or Flying Fragments
• Ground Vibrations
• Noise ( correctly Air overhead Pressure)

Fly Rock

Flying Fragments or Fly Rock is the easiest control with

Ground Vibrations

• Every Structure can withstand certain amount of Vibrations.
• Fortunately considerable research took place in this area and most of the countries have prescribed limits for ground vibrations. Some states and towns may have their own standards, hence it is advisable to check the standards before commencing the blasting operations.
• Download Vibration Limits:
  • India
  • United States
  • German

Noise

• Damage due to Sudden and continuous exposure to Noise is well Known. To ensure the safety of your structure:
• Request the blaster or builder to hire a third party to record the structural conditions of your property, such as visible cracks. This helps in knowing the quality of your property and supports your claim in case of a dispute. Ensure you sign the inspection report along with the hired inspector.
• Each blast should be monitored for Vibrations and AOP (air over pressure). In case of doubt ask for the report.

Can I get a record of all the blasts?
No. Instruments record all the readings above certain limits otherwise memory will be full of spurious and unwanted events. If you have concerns, check the trigger limits that can be verified in the instrument or are mentioned on the graph.