If the soil strength is greater than 0.5 tsf but less than 1.5 tsf, what type of soil is indicated?

The correct answer, indicating soil type B, is appropriate because soil classification is often determined based on its unconfined compressive strength, which is measured in tons per square foot (tsf). Soil in the range of greater than 0.5 tsf and less than 1.5 tsf is typically classified as type B soil. This type of soil generally has moderate strength and is considered to have a higher potential for stability compared to type C soil, which has lower strength characteristics.

Type B soil can support construction and excavation work reasonably well, but precautions still need to be taken due to its moderate strength. This classification is essential for ensuring safety during excavation and construction activities, as it helps in determining the necessary protective measures and excavation angles that may be required.

In contrast, type A soils have greater strength, typically more than 1.5 tsf, and type C soils possess lower strength and have strength values less than 0.5 tsf. Type D soils are often more unstable or weak, but specific values are not always applied in this approach.

Understanding these classifications is vital for anyone working in construction or excavation and helps inform safe working practices.