Which type of soil is deemed the safest for excavation work?

Cohesive soil, such as clay, is considered the safest for excavation work due to its structural properties. Clay, a type of cohesive soil, tends to hold together well, providing better stability during excavations. This characteristic reduces the likelihood of cave-ins and provides safer working conditions for employees on site. The cohesive nature of clay allows it to maintain a slope without crumbling or collapsing, which is crucial for protecting workers from potential hazards while excavating.

Conversely, granular soil, which includes sandy soils, does not hold together as well as cohesive soil and is more prone to shifting and collapsing, especially when saturated with water. Loose sandy soils can create unstable conditions, increasing the risk of accidents in excavation sites. Rocky soils, while they can be stable, may present challenges in terms of excavation due to their hardness and the potential for falling debris, requiring special equipment and safety measures.

Understanding the properties of different soil types is essential for making informed decisions regarding excavation safety, and the preference for cohesive soil underscores the importance of stability in maintaining a safe working environment.