Heavy Equipment Operator Certification Exam Prep · Question
During an excavation, groundwater begins to seep into the trench, causing the soil on the lower third of the trench wall to become saturated. What is the immediate and most critical hazard related to slope stability?
Groundwater significantly reduces soil cohesion and increases hydrostatic pressure, which is a major factor in causing trench wall failures, particularly 'toe f
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Question: During an excavation, groundwater begins to seep into the trench, causing the soil on the lower third of the trench wall to become saturated. What is the immediate and most critical hazard related to slope stability?
Answer options: ✅ Increased risk of toe failure due to hydrostatic pressure and reduced soil cohesion.
- Increased difficulty for workers to move within the trench due to muddy conditions.
- Reduced visibility for the excavator operator.
- Potential for equipment tires to become stuck in the wet soil at the bottom.
Correct answer: Increased risk of toe failure due to hydrostatic pressure and reduced soil cohesion.
Explanation: Groundwater significantly reduces soil cohesion and increases hydrostatic pressure, which is a major factor in causing trench wall failures, particularly 'toe failures' where the bottom of the slope gives way.
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