1. What is Peak Particle Velocity?

Peak Particle Velocity (PPV) is a measure of ground vibration caused by blasting operations. It approximates the maximum speed at which the ground moves during a blast and is used to assess potential damage to nearby structures.

2. How Does the Calculator Work?

The calculator uses the PPV equation:

Where:

• \( PPV \) — Peak particle velocity (mm/s)
• \( A \) — Site factor (dimensionless constant)
• \( d \) — Distance from blast (meters)

Explanation: The equation shows that vibration decreases with distance raised to the power of 1.5, with the site factor accounting for local geological conditions and blast design.

3. Importance of PPV Calculation

Details: Calculating PPV is crucial for blast design to ensure vibrations stay below regulatory limits and don't cause damage to nearby structures or discomfort to residents.

4. Using the Calculator

Tips: Enter the site factor (typically determined from previous blasts in similar conditions) and the distance from the blast. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What are typical PPV limits?
A: Limits vary by jurisdiction but often range from 5-25 mm/s depending on structure type and distance.

Q2: How is the site factor determined?
A: The site factor is typically derived from regression analysis of previous blast data at the site.

Q3: What affects PPV values?
A: Charge weight per delay, distance, geology, confinement, and blast design all influence PPV.

Q4: Are there other vibration prediction equations?
A: Yes, other common forms include square root scaling (PPV = k*(√(W)/d)^n) and cube root scaling.

Q5: How accurate is this prediction method?
A: Accuracy depends on proper determination of site factor. Predictions are typically within ±30% of measured values.