What is the maximum allowable slope for Type A soil?

The maximum allowable slope for Type A soil is 3/4:1. This ratio indicates that for every unit of vertical rise, the horizontal distance extends 0.75 units. Type A soils typically have higher cohesion and lower plasticity compared to other soil types, making them more stable and capable of supporting steeper slopes without the risk of collapse. Safety standards dictate that this slope ratio is the maximum to ensure the structural integrity of excavations and to minimize the chance of cave-ins.

Understanding the properties of Type A soil helps in determining the safest practices for construction and excavation projects, particularly in maintaining a balance between stability and safety.