What is the maximum slope requirement for excavations in unstable soil?

The maximum slope requirement of 1.5:1 for excavations in unstable soil is based on the need to ensure safety and stability during excavation activities. A slope of 1.5:1 means that for every 1.5 units of horizontal distance, there is a decrease of 1 unit in vertical height. This gentler slope helps to reduce the risk of soil collapse, which is a significant concern in unstable or loose soil conditions.

Stable excavations are essential to prevent potential accidents, such as cave-ins, which can endanger workers and equipment. A slope of 1.5:1 provides a balance between safety and work efficiency, allowing for necessary excavation without compromising the structural integrity of the surrounding soil. This requirement aligns with established safety standards and best practices in excavating procedures, enhancing overall job site safety.