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Questions and Answers
___ soil has a high clay content and is very durable and strong.
___ soil has a high clay content and is very durable and strong.
cohesive
___ refers to the soil removed from an excavation.
___ refers to the soil removed from an excavation.
spoils
Which of the following is an example of the dangers posed by excavations?
Which of the following is an example of the dangers posed by excavations?
- Cave-ins
- Falling loads
- All the above (correct)
- Hazardous gases
Oxygen concentration in the air is considered deficient if it drops below ___%.
Oxygen concentration in the air is considered deficient if it drops below ___%.
Before excavation work begins, employers must:
Before excavation work begins, employers must:
Submerged soil or soil from which water is freely oozing may be classified as ___ soil.
Submerged soil or soil from which water is freely oozing may be classified as ___ soil.
Heaving or squeezing would be indicated by which of the following signs?
Heaving or squeezing would be indicated by which of the following signs?
Which method of protection involves vertical sidewalls with horizontal struts?
Which method of protection involves vertical sidewalls with horizontal struts?
Shaping a moist or wet sample of soil into a ball and rolling it into threads is called a ___ test.
Shaping a moist or wet sample of soil into a ball and rolling it into threads is called a ___ test.
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Study Notes
Soil Types and Properties
- Cohesive soil is characterized by high clay content, making it durable and strong.
Excavation Terminology
- Spoils refer to the soil that has been removed during an excavation process.
Hazards of Excavation
- Dangers posed by excavations can include various risks, categorized under "all the above."
Air Quality Standards
- Oxygen concentration is considered deficient in the air if it drops below 19.5%.
Pre-Excavation Requirements
- Before beginning excavation work, employers must fulfill certain obligations collectively categorized as "all the above."
Soil Classification
- Submerged soil or soil with freely oozing water is classified as Type C soil, indicating higher instability.
Signs of Soil Movement
- Heaving or squeezing in soil is suggested by a bulge at the bottom, indicating structural issues.
Protection Methods in Excavation
- Trench boxes are a method of protection that uses vertical sidewalls reinforced with horizontal struts.
Soil Testing Methods
- The plasticity test involves shaping a moist or wet soil sample into a ball and rolling it into threads to assess its plasticity characteristics.
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