Excavator Operator Certification Exam Prep · Question
When digging a trench in soft, unstable soil, which trenching technique is most appropriate to ensure worker safety and prevent collapse?
Benching or sloping the trench walls reduces the angle of repose, making the trench more stable and preventing soil collapse, which is crucial in soft, unstable
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Question: When digging a trench in soft, unstable soil, which trenching technique is most appropriate to ensure worker safety and prevent collapse?
Answer options: ✅ Benching or sloping the trench walls
- Digging straight, vertical walls without support
- Using a vibratory compactor to stabilize the trench walls
- Excavating in 3 m sections and immediately backfilling
Correct answer: Benching or sloping the trench walls
Explanation: Benching or sloping the trench walls reduces the angle of repose, making the trench more stable and preventing soil collapse, which is crucial in soft, unstable soils. Digging straight vertical walls is unsafe without proper shoring, and compaction alone may not prevent collapse in highly unstable soil. Excavating and immediately backfilling in sections is more related to pipeline installation than initial trench stability.
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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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