The method of dynamic compaction is a method that the heavy hammer of dozens of tons falls freely from the height to forcefully ram the soil. The high quality heavy hammer falls freely at a certain height and has potential energy. When it falls to the ground, compression wave and shear wave will be generated to damage the soil structure and make the soil particles tighter
When the dynamic compaction method began to use, only used for strengthening sand and gravel soil foundation, after more than 20 years of application, it has been used for miscellaneous fill soil, gravel soil, sandy soil, clay soil, collapsible loess and artificial fill soil and other foundation treatment. The mechanism of consolidation of foundation by dynamic compaction is generally believed that the mechanism of increasing the strength of foundation after dynamic compaction is the transformation of ramming energy, accompanied by forced compression or vibration density (including gas drainage and pore water pressure rise)), soil liquefaction or soil structure failure (manifested as soil strength reduction or shear strength loss)), drainage consolidation compaction(On the surface, permeability changes, soil cracks develop and soil strength increases), thixotropic recovery and trip with consolidation compaction (including part of the free water turns into film water, soil temperature continues to increase).
Schematic diagram of strength growth process of soil in dynamic compaction stage:
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