A method where multiple sand piles are constructed under the seabed by using the specific sand piling barge. It is one of the most typical vertical drain method executed at sea. In recent year, the piling barge is moving towards bigger capacity, and now the specific barge with 12 pile drivers has become the main force.
A method to facilitate the consolidation by attempting to shorten the drainage distance through the installation of numerous vertical sand piles, which the casing pipe is driven into the soft cohesive ground, and to discharge the sand inside while withdrawing the casing. Land SD Method is one of the most typical vertical drain method where it is widely used together with surcharge method.