skills · teach

Vibration, noise, dust

Write the neighbour limit before the first hit. We do not sell a blast recipe.

Study notes. Not a certificate. Not a licence. Not NEBOSH, PESO, ISEE, or IDE. We never design the charge, spacing, or the cut. Site hours and statutory papers have no video substitute.

1. Wave types and propagation; near vs far field.

   Near field and far field behave differently. Know which receptor you are protecting.

   8 h · teach

2. PPV, frequency content, and why frequency matters as much as amplitude.

   Amplitude without frequency is half a story. Write the standard that applies at this receptor.

   10 h · teach

3. Scaled-distance laws — square-root (blast) vs cube-root (airblast); K and b; why a monitored trial blast beats any published constant.

   A copied K and b from another city is assumed. A monitored trial at this site is a measurement.

   12 h · teach

4. Standards: DIN 4150-3, BS 7385-2, USBM RI 8507, and the local limit that actually applies.

   Name the limit that applies here. Do not paste a table from a different country onto this neighbour.

   10 h · teach

5. Airblast/overpressure: dBL, the 133 dBL screening limit, window-breakage thresholds (~169 dBL), and confinement.

   Airblast is not ground vibration. Windows care about dBL.

   10 h · teach

6. Impact/touchdown vibration from the collapse itself — a different mechanism from the detonation, and often the bigger one.

   The building hitting the ground is often the vibration neighbours feel. It is not a blast recipe.

   8 h · teach

7. Instrumentation: geophones, sound level meters, triggers, ranges. Know your instrument's floor and ceiling — it decides what "not recorded" means.

   Know the floor and ceiling of the box you brought. A silent trace can mean the instrument was deaf.

   10 h · teach

8. Monitoring programme design: receptor selection, station siting, pre-condition surveys, crack gauges, tiltmeters.

   Receptors, stations, crack gauges, a pre-condition survey. After the complaint is too late.

   10 h · teach

9. Dust: generation, suppression, monitoring, PM standards.

   Water at the tool, wind, neighbours. Suppression is a method line, not a hope.

   6 h · teach

10. Noise: BS 5228, LAeq, working-hour limits, community expectations.

    Hours, LAeq, who is next door. Write the limit and the expectation.

    6 h · teach