Helical piles are installed into the ground much like a screw into wood. They are advanced using hydraulic rotary drive motors to a depth suitable to carry the specified loads.
Resistance Piles, or Push Piles are installed by hydraulically pressing the pile into the ground using the structure as a counter weight. Installation pressure correlates to the load capacity of the pile.
Soil Retention Systems
Soil retention systems are mechanisms by which earth/soil is held at a vertical or sloped configuration for extended periods of time. Gravity retaining walls, MSE (Mechanically Stabilized Earth), Soil Nails / Shotcrete, & Gabbion blocks are all examples of Soil Retention Systems.