What type of soil is referenced in the short term maximum allowable slope for excavations according to OSHA?

What type of soil is referenced in the short term maximum allowable slope for excavations according to OSHA?

• A. Sand
• B. Clay
• C. Type A soil
• D. Type B soil

Answer: (C)

The short-term maximum allowable slope for excavations as referenced by OSHA is specifically related to Type A soil. Type A soil is characterized as the most stable type of soil for excavation purposes, typically consisting of clay, silty clay, and clay with high cohesion. Because of its cohesive properties, Type A soil allows for a greater slope when excavating, reflecting its increased stability and reduced risk of collapse. Under OSHA regulations, the angle of repose (the steepest angle at which a sloped surface remains stable) is gentler for Type B soil, which is less stable than Type A, and allows for a more conservative approach to excavation. However, the short-term allowable slope is less steep for less cohesive materials, such as sand or non-cohesive soils, as these generally have a higher risk of failure under similar conditions. Thus, recognizing the properties of Type A soil emphasizes its suitability for deeper, short-term excavations while maintaining safety standards.

The short-term maximum allowable slope for excavations as referenced by OSHA is specifically related to Type A soil. Type A soil is characterized as the most stable type of soil for excavation purposes, typically consisting of clay, silty clay, and clay with high cohesion. Because of its cohesive properties, Type A soil allows for a greater slope when excavating, reflecting its increased stability and reduced risk of collapse.

Under OSHA regulations, the angle of repose (the steepest angle at which a sloped surface remains stable) is gentler for Type B soil, which is less stable than Type A, and allows for a more conservative approach to excavation. However, the short-term allowable slope is less steep for less cohesive materials, such as sand or non-cohesive soils, as these generally have a higher risk of failure under similar conditions. Thus, recognizing the properties of Type A soil emphasizes its suitability for deeper, short-term excavations while maintaining safety standards.