Which anchor is used for hardpan or rocky, damp soil?

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

In hard, dense, damp soil such as hardpan or rocky ground, you want an anchor that can bite in and lock rather than just press against a surface. A cone anchor is designed for this situation: its tapered, cone-shaped body is driven into the soil and wedges against the surrounding material as it penetrates, creating a large contact and friction area that resists pullout. That wedging action is especially effective in dense or rocky soils where other anchors struggle to gain grip.

Expansion anchors require a pre-drilled hole and rely on the material to compress around the expansion mechanism, which can be unreliable in hard, rocky layers. Screw anchors depend on threading into the soil, which is difficult or impossible in hardpan or rocky substrates. Plate anchors need a relatively uniform surface behind them to bear against; in irregular, hard, or fractured ground they don’t develop as much hold.