Natural water content of soil is very important for dynamic compaction treatment. When natural water content is less than 10%, the friction between particles is great, fine soil particles are difficult to be filled, and the surface layer is hard. The surface soil is easy to loosen during compaction. The energy of compaction is consumed on the surface soil. The deep soil layer is not easy to be compacted, and the effective depth of collapsible loess is small. The compaction quality can not reach the design effect.
When the upper load passes through the surface soil to the deep soil layer, it will consolidate and settle due to the compression of the deep soil layer, causing damage to the upper buildings.