Excavator Operator Certification Exam Prep · Question
What is 'heaving' in the context of trenching, and why is it dangerous?
Heaving occurs when external soil pressure causes the trench bottom to bulge upwards, often in soft, saturated soils. This can compromise the structural integri
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Question: What is 'heaving' in the context of trenching, and why is it dangerous?
Answer options: ✅ The upward movement of a trench bottom due to external pressure, which can cause trench floor failure.
- The settling of the trench walls after excavation.
- The process of removing large rocks from a trench.
- The accumulation of water at the bottom of a trench.
Correct answer: The upward movement of a trench bottom due to external pressure, which can cause trench floor failure.
Explanation: Heaving occurs when external soil pressure causes the trench bottom to bulge upwards, often in soft, saturated soils. This can compromise the structural integrity of the trench and lead to collapse, posing a severe risk to workers.
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Question explanations
- During a final inspection of an excavator, prior to beginning work, an operator notices significant play in th
- An excavator operator is preparing to dig a trench in cohesive soil. To achieve maximum breakout force, what a
- Which control typically governs the arm (or dipper arm) movement for an excavator?
- What condition might require sloping or shoring of a trench less than 1.2 meters (4 feet) deep?
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