Questions and Answers
What does Type A soil include?
No soil is classified as Type A if fissured.
True
What is the unconfined compressive strength range for Type B soil?
Greater than 0.5 tsf but less than 1.5 tsf
Type C soil has an unconfined compressive strength of _____ tsf or less.
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Which of the following soils can be classified as Type C?
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Match the soil type with its characteristics.
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Granular cohesionless soils can be classified as Type B.
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What manual tests are used to analyze soil properties?
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Study Notes
Soil Classification - Section 1926.652 - Subpart P - Appendix A
- Type A Soil: Cohesive soils with unconfined compressive strength of 1.5 tsf (144 kPa) or greater.
- Examples of Type A: Clay, silty clay, sandy clay, clay loam, cemented soils (e.g., caliche, hardpan).
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Exclusions for Type A:
- Fissured soils
- Soils affected by heavy traffic vibrations
- Previously disturbed soils
- Sloped layered systems with steep angles (≥ 4H:1V)
- Materials classified as less stable.
Soil Classification - Type B
- Type B Soil: Cohesive soils with compressive strength between 0.5 tsf (48 kPa) and 1.5 tsf (144 kPa).
- Includes: Granular cohesionless soils (e.g., angular gravel, silt, sandy loam).
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Exclusions for Type B:
- Fissured soils meeting Type A criteria but disturbed
- Dry, unstable rocks
- Sloped systems with less steep angles (< 4H:1V).
Soil Classification - Type C
- Type C Soil: Cohesive soils with compressive strength of 0.5 tsf (48 kPa) or less.
- Includes: Granular soils (e.g., gravel, sand), submerged soils, and submerged unstable rocks.
- Special Conditions: Sloped layered systems with steep angles (≥ 4H:1V) also classified as Type C.
Acceptable Visual and Manual Tests
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Visual Tests:
- Analyze excavation samples for particle size and composition.
- Cohesive soils form clumps; granular soils do not.
- Inspect for cracks indicating fissured material and observe soil movement.
- Check for utilities and previous disturbances near excavation sites.
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Manual Tests:
- Assess properties like plasticity, dry strength, and perform thumb penetration tests.
- Conduct additional strength and drying tests for a comprehensive soil analysis.
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Description
Test your knowledge on OSHA Section 1926.652 related to soil classification for excavations. This flashcard set covers key definitions, types of soils, and their characteristics, specifically focusing on Type A cohesive soils. Perfect for those studying construction safety and regulations.