Ultimate Bearing Capacity Calculator

Ultimate Bearing Capacity Formula:

\[ q_f = q_{net} + \sigma_s \]

Ultimate Bearing Capacity:

1. What is Ultimate Bearing Capacity?

Definition: Ultimate Bearing Capacity is defined as the minimum gross pressure intensity at the base of the foundation at which the soil fails in shear.

Purpose: It helps engineers determine the maximum load that can be applied to the soil before shear failure occurs.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ q_f = q_{net} + \sigma_s \]

Where:

\( q_f \) — Ultimate Bearing Capacity (kPa)
\( q_{net} \) — Net Ultimate Bearing Capacity of Soil (kPa)
\( \sigma_s \) — Effective Surcharge (kPa)

Explanation: The net bearing capacity is combined with the effective surcharge to determine the total ultimate bearing capacity of the soil.

3. Importance of Ultimate Bearing Capacity Calculation

Details: Proper calculation ensures foundation stability, prevents structural failure, and helps in designing appropriate foundation sizes.

4. Using the Calculator

Tips: Enter the net ultimate bearing capacity of soil and effective surcharge in kPa. The values can have a ±5% margin of error.

5. Frequently Asked Questions (FAQ)

Q1: What is net ultimate bearing capacity?
A: It's the minimum net pressure intensity that causes shear failure in the soil, excluding the effect of surcharge.

Q2: What is effective surcharge?
A: It's the vertical pressure or load acting over the ground surface in addition to basic earth pressure.

Q3: Why is there a ±5% margin?
A: Soil properties can vary, so this accounts for potential measurement or estimation inaccuracies.

Q4: How do I determine net ultimate bearing capacity?
A: It can be determined through soil testing or using standard values for different soil types.

Q5: What units should I use?
A: The calculator uses kilopascals (kPa) for all inputs and outputs.