What is a common risk factor when working in excavations deeper than 5 feet?

Cave-ins are a common and significant risk factor when working in excavations deeper than 5 feet due to the geological instability that occurs at deeper levels. The walls of a trench or excavation can become unstable as depth increases, especially in loose soil or when subjected to moisture from rain, groundwater, or other sources. The weight of the surrounding earth can create a powerful force that can cause sections of soil to collapse, posing immediate threats to workers within the excavation.

Preventive measures such as sloping the sides of the excavation, using trench boxes or protective systems, and regularly inspecting the site can mitigate the risks associated with cave-ins. Understanding the inherent dangers of excavating to such depths is essential for maintaining safety during excavation operations, making awareness of cave-ins a critical element in excavation safety practices.