Earthwork Calculations MCQ with answer and solution

Concept

Earthwork Measurement and Soil Bulking

Formula

N/A

Step-by-step solution

1. Review the guidelines for measuring earthwork excavation for trenches. 2. Recall that excavation quantities are measured in the natural, undisturbed state (in-situ volume) to account for soil bulking. 3. Select Option (D) as the correct answer.

Explanation

Earthwork in excavation is measured in its natural, undisturbed state (in-situ volume) before it is dug out. This is because soil expands and increases in volume once it is excavated (known as swelling or bulking), making loose volume measurements inaccurate for estimating the actual quantity of excavation required.

Shortcut

To remember how earthwork in excavation is measured, use the rule "In-Situ = In-Ground": - Natural State (In-Situ): Excavation is always measured in its original, undisturbed state before digging. - Bulking Effect: Soil expands once excavated (loose volume), so measurements are strictly based on the undisturbed pit volume to remain accurate.

Common mistake

A common mistake is selecting option A by assuming that earthwork is measured based on the loose volume of soil after excavation. Students often forget that soil expands and increases in volume once excavated due to bulking, so engineering calculations for excavation are strictly based on the volume of the trench in its natural, undisturbed state (in-situ).