What does the term 'slough-in' refer to in trench safety?

The term 'slough-in' specifically refers to the collapse of a portion of a trench wall that occurs when an overhang or unstable soil structure above is unable to support itself. This phenomenon can pose significant hazards to workers in a trench, as sections of soil can break away and fall into the excavation, potentially causing injury or entrapment. Understanding this term is crucial for trench safety, as it highlights the importance of proper excavation practices, soil management, and the use of protective systems to maintain trench wall stability and protect personnel on-site. Recognizing the risks associated with slough-in can aid in implementing safer working conditions for personnel involved in trenching operations.