Distinguish a loose block from overall instability
Scaling removes fragments that could fall; stabilisation may require engineered support, drainage or changes to the slope geometry. A face that looks clean is not proof of a stable rock mass. Joints, bedding, faults and water influence the way movement can develop.
Assessment must include the crest, toe and areas that would receive falling material. Surrounding roads, facilities, access routes and equipment also matter. Experience gained at a neighbouring excavation cannot replace information about the actual face being treated or the people exposed to it.
Select a method that keeps people away from falling material
The equipment must reach the intended area from a stable and protected position. Check face height, effective reach, block size and manoeuvring space. The cab must not be placed in the expected fall path simply because the machine has overhead protection.
Excavators and backhoe loaders require suitable supporting ground and configuration. For rope access work, fall protection does not protect against rock impact or failure of the area carrying the anchors. Access selection and rescue arrangements therefore need coordination with the person responsible for geotechnical assessment.
Keep fall and catch areas clear
Exclusion zones must account for bouncing and rolling material as well as vertical falls. Coordinate people above, below and on adjoining faces. Passage through the lower area must not be permitted while the operation could release material into it.
Catch benches and other containment arrangements lose effectiveness when filled with debris. Cleaning them is itself an exposed activity requiring a plan, rather than an improvised visit to the toe. Blocked drains and altered runoff can affect stability even when the visible slope geometry appears unchanged.
Recognise when the work needs review
New cracks, fresh rubble, bulging, seepage or changes in water flow are reasons to stop exposure and obtain competent assessment. Rain, freezing conditions and changes in method justify further checks. Records should identify observed conditions, decisions and released areas. A single photograph or the removal of one loose rock cannot certify the safety of the whole slope, including sections outside the immediate working position.
