Alabama Contractors License Practice Exam

What is the maximum cut slope allowed for permanent excavations?

1. 1 to 1

2. 2 to 1

3. 3 to 1

4. 4 to 1

The correct answer is: 2 to 1

The maximum cut slope allowed for permanent excavations is typically 2 to 1, meaning for every 2 units of horizontal distance, there can be a 1 unit of vertical drop. This ratio is significant in construction and excavation practices because it balances safety and stability. A 2 to 1 slope is generally considered a safe angle that mitigates the risk of soil erosion and collapse, providing enough support for excavated earth. Such slopes reduce the likelihood of rock and soil slumping into the excavation space, benefiting safety for workers and the integrity of the excavation site. Other slope ratios, such as steeper slopes like 1 to 1, can lead to instability, while less steep slopes, like 3 to 1 or 4 to 1, might not be necessary in many typical excavation scenarios, making the 2 to 1 slope a widely accepted standard for permanent excavations in varied soil conditions.