What are Stone Columns?

About The Technique

Stone Columns #SC are formed with various methods using different equipment depending on the depth and diameter of the columns and the parameters of the soil to be improved. The popularity of this method resulted in its widespread use.

#GroundImprovement

Ground improvement with stone columns requires adding vertical columns of stone into the ground to the design depth that can be up to 20 m or more. A layer of compacted granular fill is typically put over the top of the columns as drainage blanket and to enhance load transfer platform to spread the load from the structures to be built on top of the treated ground. The stone column method is quick to construct and can be done at any time of the year.

Machine for Stone Columns

The construction uses a base machine (either crane or excavator) with a vibrating probe to feed stone into the ground, forming a vertical column of stone. Some stone column rigs feed stone into the ground through the vibrating probe, exiting at the bottom, and other rigs require the stone to be fed in from the ground surface down the vertical hole in the ground. Both types use a vibrating probe that densifies the surrounding soils and the stone fed into the ground.

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