Risks during excavation work on soft rock slope

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  • Hiraoka Nobutaka
    Construction Safety Research Group, National Institute of Occupational Safety and Health, Japan
  • Kikkawa Naotaka
    Construction Safety Research Group, National Institute of Occupational Safety and Health, Japan

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  • 軟岩斜面の掘削工事におけるリスク
  • ナンガン シャメン ノ クッサク コウジ ニ オケル リスク

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<p>Labor accidents due to slope failure and rock fall are topics of high concern in occupational safety governance; such accidents usually occur during excavation works carried out on slopes. Excavation works on rock slopes are difficult and hazardous because the slopes have varying geological and physical properties, different types of stratification, and a complex geometry. Therefore, many accidents occur during such excavation works on rock slopes.</p><p>In this study, we present a case history of a real-life labor accident due to slope failure on soft rock. We then extract the hazards and risks from the example and suggest preventive measures against the risks involved. The height of the slope, slope angle, ground water level inside the slope, and the boundary between the strata of the slope were considered especially as factors of hazards. For proposing preventive measures against accidents, we must consider carrying out a ground survey, create a design for excavation based on the survey, conduct inspection of the slope, and follow the observational procedure in construction project.</p>

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