Dynamic compaction method is a physical method in foundation treatment, which applies impact to compact the soil. Its principle is mainly to use the powerful tamping energy of dynamic compactor to force soil liquefaction and dynamic consolidation to make the soil compact. Dynamic compaction method is mainly used to promote the strength of foundation soil, reduce compactness and eliminate soil collapsibility, swelling shrinkage and liquefaction. Here are three different reinforcement mechanisms of dynamic compaction method:
1、 Dynamic consolidation: when the dynamic compaction method is applied to the treatment of fine-grained saturated clay, its reinforcement mechanism is the dynamic consolidation theory. During operation, the huge impact will produce a large stress wave in the soil, thus damaging the original structure of the soil, so as to make the local liquefaction of the soil and produce many cracks, increase the drainage channel, and make the pore water escape smoothly. After the excess pore water pressure dissipates, the soil will be consolidated. Due to the thixotropy of soft soil, the strength is restored.
2、 Dynamic compaction: the reinforcement of porous, coarse-grained and unsaturated clay by dynamic compaction method is based on the mechanism of dynamic compaction, that is, impact dynamic load, which reduces the pores in the soil and makes the soil dense, so as to improve the strength of foundation soil.
3、 Dynamic replacement: dynamic replacement can be divided into integral replacement and pile replacement. Integral replacement uses dynamic compaction to squeeze the gravel into the sludge as a whole, and its action mechanism is similar to that of soil replacement cushion. Pile replacement is to fill the gravel into the soil through dynamic compaction, and part of the gravel piles (or piers) are tamped into the soft soil at intervals to form a pile (pier) gravel pile (pier). Its action mechanism is similar to the gravel pile formed by vibroflotation method, which forms a composite foundation as a whole.
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