EXC/Support Systems/TBT-EXC-031
Battered Excavation Design and Angles
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Toolbox Talk
Battered Excavation Design and Angles
Battering an excavation means cutting the sides back to a safe slope angle instead of using mechanical support systems. The safe angle depends on the soil type, moisture content, and surcharge loads near the edge. Getting the angle wrong causes slope failure which can bury workers in seconds. This talk explains how battered excavations work, the factors that determine safe angles, and the controls every operative must follow.
Key Hazards
Slope failure burying workers if the batter angle is too steep for the soil
Water ingress softening soil and reducing the stable batter angle after rain
Surcharge loads from plant or spoil heaps overloading the excavation edge
Workers entering battered excavations assuming the slopes are always stable
Control Measures
- Ensure the batter angle is specified by a competent person based on the actual soil conditions.
- Do not steepen the designed batter angle to save space or speed up excavation progress.
- Inspect battered slopes before each shift and after rainfall for signs of cracking or slumping.
- Keep spoil heaps, plant, and materials back from the batter crest at the distance specified.
- Install surface water drainage to prevent water running over the batter face and softening the soil.
- Reduce the batter angle or install support if ground conditions deteriorate below the design assumptions.
- Brief all operatives on the safe approach distances from the batter edge before entering the excavation.
- Provide safe access into battered excavations using ladders or ramps positioned away from the slopes.
- Record batter angles and inspection findings in the excavation register after each check.
Remember
- The batter angle must be specified by a competent person based on actual soil conditions on site
- Never steepen the designed batter angle to save space or speed up excavation work
- Inspect battered slopes before each shift and after any rainfall for cracking or slumping
- Keep spoil heaps, plant, and materials back from the batter crest at the specified distance
- Reduce the angle or install support if ground conditions worsen below the design assumptions
- Record batter angles and inspection findings in the excavation register after every check
Applicable Legislation: CDM Regulations 2015 · BS 6031:2009 (Earthworks) · Health and Safety at Work etc. Act 1974 · BS 5975:2019 (Temporary Works)
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