OSHA Section 1926.652 Excavations Flashcards
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Questions and Answers

What does Type A soil include?

  • Granular cohesionless soils like gravel and sand
  • Stable submerged soils
  • Cohesive soils with an unconfined compressive strength of 1.5 tsf or greater (correct)
  • Previously disturbed soils
  • 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.

    <p>0.5</p> Signup and view all the answers

    Which of the following soils can be classified as Type C?

    <p>All of the above</p> Signup and view all the answers

    Match the soil type with its characteristics.

    <p>Type A = Cohesive soils with a strength of 1.5 tsf or greater Type B = Cohesive soil between 0.5 tsf and 1.5 tsf Type C = Cohesive soil with a strength of 0.5 tsf or less Type D = Granular soils like sand and gravel</p> Signup and view all the answers

    Granular cohesionless soils can be classified as Type B.

    <p>True</p> Signup and view all the answers

    What manual tests are used to analyze soil properties?

    <p>Plasticity, Dry Strength, Thumb presentation, Other strength test, Drying test</p> Signup and view all the answers

    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).
    • 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).
    • 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

    • 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.
    • 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.

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