Which anchor is suitable for fine, moist, loose, wet 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!

In soft, moist, loose, or wet soils, you want an anchor that actually digs in and locks with the soil rather than relying on a static bearing. A screw anchor achieves this by using a helical blade that is driven into the ground. As it screws in, it displaces and compacts soil, creating a continuous threaded interface along the embedded length. That threaded engagement provides substantial pull-out resistance through a combination of skin friction along the shaft and mechanical interlock from the threads—so the anchor remains secure even when the soil is loose or saturated.

Other types rely more on expansion behind a backing, plate contact against a solid wall, or a pointed tip with limited surface area. In fine, moist, or wet soils, those mechanisms tend to offer less reliable grip: expansion anchors need solid backing to press against, plate anchors require firm bearing, and cone-type systems can struggle to maintain hold in loose substrates. The screw’s distributed grip along its length makes it the most dependable choice for difficult, water-saturated soil conditions.