1. What Is Borehole Grout Volume Calculation?

Borehole grout volume calculation determines the amount of grout material needed to fill the annular space between a borehole casing and the surrounding soil or rock formation. This is essential for proper well construction and groundwater protection.

2. How Does the Calculator Work?

The calculator uses the cylindrical volume formula:

Where:

• \( r_{outer} \) — Outer radius of the borehole (m)
• \( r_{inner} \) — Inner radius of the casing (m)
• \( h \) — Height or length of the grouted section (m)
• \( \pi \) — Mathematical constant (approximately 3.1416)

Explanation: The formula calculates the volume of the annular space between two cylinders, which represents the grout volume needed.

3. Importance of Accurate Grout Volume Calculation

Details: Accurate grout volume estimation is crucial for proper borehole sealing, preventing groundwater contamination, ensuring structural stability, and avoiding material waste or shortages during construction.

4. Using the Calculator

Tips: Enter all measurements in meters. Ensure the outer radius is larger than the inner radius. All values must be positive numbers with the outer radius greater than the inner radius.

5. Frequently Asked Questions (FAQ)

Q1: Why is grouting important in borehole construction?
A: Grouting seals the annular space, prevents surface water infiltration, protects groundwater quality, and provides structural support to the borehole.

Q2: What units should I use for measurements?
A: The calculator uses meters for all dimensions. Convert from other units before calculation if necessary.

Q3: How much extra grout should I account for?
A: Typically add 10-15% extra volume to account for uneven borehole walls, material loss, and contingencies.

Q4: Does this calculation work for inclined boreholes?
A: Yes, the formula works for inclined boreholes as long as you use the true vertical depth for the height measurement.

Q5: What if my borehole isn't perfectly cylindrical?
A: For irregular boreholes, consider taking multiple measurements at different depths and calculating an average volume.