What is the compressive strength required for a cohesive soil to be classified as Type A?

A cohesive soil is classified as Type A when its compressive strength meets the minimum requirement of 1.5 tons per square foot (tsf). The classification of Type A soil reflects its stability and ability to withstand load without failure. When cohesive soils possess this level of compressive strength, they are deemed sufficiently strong to support construction activities and excavations safely.

This criterion is important for ensuring safe excavation practices, as Type A soils have the highest degree of cohesion. When evaluating soil types for construction and excavation work, knowing these classifications helps operators and engineers assess the risks involved and make informed decisions regarding excavation methods, shoring, and other necessary safety measures.

Understanding the specific strength values—such as the minimum compressive strength for Type A soils—ensures adherence to safety regulations and standards, thus protecting both workers and the integrity of the construction site.