What is the approximate angle of repose for average soils using the sloping method for cave-in prevention?

The correct answer is that the approximate angle of repose for average soils using the sloping method for cave-in prevention is typically 1.0:1.0. This ratio signifies that for every one unit of vertical rise, there is a requirement for one unit of horizontal distance.

Understanding this ratio is crucial in excavation and trench safety practices to prevent soil collapse and potential cave-ins. The angle of repose indicates the steepest angle at which a sloped surface of soil can remain stable without sliding or collapsing. For average soils, this angle typically achieves a balance between safety and practicality in excavation work, ensuring that the side slopes of trenches or excavations are not too steep, allowing for both safety and efficient work processes.

In situations where soils are looser or have more cohesion, steeper angles might be feasible, but for average soil conditions, adhering to this more moderate 1.0:1.0 ratio helps mitigate risks of soil movement and provides a safer work environment.