Length of Borehole using Burden Calculator

Length of Borehole Formula:

\[ L = \frac{B^2}{D_h} \]

Length of Borehole: m

1. What is Length of Borehole using Burden Calculator?

Definition: This calculator estimates the required length of a borehole based on the burden (distance to free face) and borehole diameter.

Purpose: It helps mining and construction professionals determine appropriate borehole dimensions for blasting operations.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ L = \frac{B^2}{D_h} \]

Where:

\( L \) — Length of Borehole (meters)
\( B \) — Burden (meters)
\( D_h \) — Diameter of Borehole (meters)

Explanation: The square of the burden is divided by the borehole diameter to determine the optimal borehole length for effective blasting.

3. Importance of Borehole Length Calculation

Details: Proper borehole length estimation ensures efficient rock fragmentation, controlled blasting, and safety in mining operations.

4. Using the Calculator

Tips: Enter the burden (distance to nearest free face) and borehole diameter in meters. Both values must be > 0. Results include ±5% tolerance.

5. Frequently Asked Questions (FAQ)

Q1: Why is burden squared in the formula?
A: The squared relationship accounts for the three-dimensional energy distribution from the blast.

Q2: What does the ±5% tolerance mean?
A: This accounts for variations in rock properties and practical field conditions.

Q3: How does borehole diameter affect the length?
A: Larger diameters require shorter boreholes for the same burden, as they can contain more explosive energy.

Q4: When would I need to adjust the calculated length?
A: Adjust for specific rock types, explosive characteristics, or special blasting requirements.

Q5: Is this formula suitable for all blasting scenarios?
A: It provides a general guideline but should be adapted based on site-specific conditions and expert advice.