OSHA 30 Hour Construction Program Practice Test

What is a common cause of unexpected collapses in excavations?

1. Management changes

2. Moving materials near the edge

3. Excessive worker training

4. Low equipment usage

The correct answer is: Moving materials near the edge

Moving materials near the edge is a common cause of unexpected collapses in excavations because it can disturb the soil stability and increase the risk of a cave-in. When heavy materials are placed or moved too close to the excavation's edge, the weight and added pressure can weaken the walls of the trench or hole. This can lead to a failure in the structural integrity of the excavation, ultimately resulting in an unexpected collapse. Maintaining a safe distance for equipment and materials from the edge of excavations is crucial for preventing accidents and ensuring worker safety. In contrast, management changes typically do not directly contribute to excavation collapses. Excessive worker training, while not practical to the work setting, enhances safety awareness without causing cave-ins. Low equipment usage is generally associated with reduced risk rather than danger, as it indicates fewer operations that could disturb the site. Understanding safe handling practices near excavation edges is vital for preventing these hazardous situations.