What must be justified to prevent trench collapse?

To prevent trench collapse, it is essential to justify the methods used in trench construction, particularly focusing on the stability of the trench walls. Assumed correct construction refers to ensuring that the trench is built in compliance with safety regulations and standards, which includes factors like proper dimensions, appropriate angle of repose, and adequate support systems such as trench boxes or shoring.

Validating construction practices helps to prevent hazards associated with trench collapses, as instability in the soil and improper excavation processes can lead to dangerous conditions. Therefore, a clear justification of the construction methods used is crucial for maintaining the safety of workers in and around the trench. Understanding and adhering to structural integrity principles guarantees that the trench can safely hold its shape without putting workers at risk.

The other choices, while relevant to safety protocols, do not directly address the physical attributes of trench construction necessary to prevent collapses.