What is used to provide holding power for cone anchors in certain soils?

Study for the BICSI OSP Design Test. Prepare using multiple choice questions, with hints and explanations to enhance understanding. Succeed in your exam journey!

Cone anchors gain holding power from the friction and mechanical interlock between the anchor and the surrounding backfill. In certain soils, placing crushed rock around the anchor creates a dense, angular-grain backfill that packs tightly around the cone, increasing resistance to pullout. This backfill enhances surface contact and interlock, giving stronger holding power than loose soil, sand, or water-filled conditions. Water would reduce friction, and soil or sand around the anchor doesn’t provide the same stable, interlocking support, so crushed rock is the best choice.