Distance from Blast Hole to Nearest Perpendicular Free Face or Burden Calculator

Burden Formula:

\[ B = \sqrt{Dh \times L} \]

Burden (Distance):

1. What is Burden in Blasting?

Definition: Burden is the distance from the blast hole to the nearest perpendicular free face.

Purpose: Proper burden calculation is crucial for effective rock blasting, ensuring optimal fragmentation and safety.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ B = \sqrt{Dh \times L} \]

Where:

\( B \) — Burden distance (meters)
\( Dh \) — Diameter of borehole (meters)
\( L \) — Length of borehole (meters)

Explanation: The burden is calculated as the square root of the product of borehole diameter and length.

3. Importance of Burden Calculation

Details: Correct burden calculation ensures efficient rock breakage, minimizes flyrock, and optimizes explosive energy use.

4. Using the Calculator

Tips: Enter the borehole diameter and length in meters. The ±5% indicates the typical tolerance range for these measurements.

5. Frequently Asked Questions (FAQ)

Q1: Why is burden important in blasting?
A: Proper burden ensures optimal rock fragmentation and controls flyrock distance for safety.

Q2: What does the ±5% tolerance mean?
A: It indicates that actual field measurements may vary up to 5% from the entered values.

Q3: How does borehole diameter affect burden?
A: Larger diameters generally require greater burden distances for effective blasting.

Q4: When would I need to adjust the calculated burden?
A: Adjustments may be needed based on rock type, explosive characteristics, or specific site conditions.

Q5: Is this formula suitable for all blasting scenarios?
A: This is a fundamental formula, but specialized conditions may require more complex calculations.