IMPROVED CABLE LOGGING ANCHORS FOR ROCKY SOILS

This project addressed the problem of inadequate anchors on rocky soil s for guylines and tailholds of cable logging equipment. A substitute tipping anchor was developed which was estimated to have a breaking st rength of 350 to 400 kN if fabricated of cast iron or mild steel. When installed and properly backfilled to depths of 2.4 to 2.7 m in a grav elly clay loam soil overlaying metavolcanic greenstone, the anchors ha d pullout capacities averaging 310 kN (95% confidence interval of 285 to 340 kN). Capacities closer to the breaking strength of the anchor w ould be expected in rockier soils.