In this technique, a circular hole is excavated up for the depth at which the soil will stand unsupported (about 0.5m for smooth clay and 2m for stiff clay). Vertical boards called laggings, are then established in position across the excavated face and are held tightly towards the soil by https://donovanxitjv.bloggip.com/30768987/helping-the-others-realize-the-advantages-of-geotechnical-pile-foundation-bd