Foundation backfill soil generally has the characteristics of uneven particle size, large pore ratio and low compacting degree, so it can not be directly used as foundation bearing layer, otherwise it is easy to produce a large degree of foundation settlement, which is not conducive to the safety of buildings, structures and municipal pipe network.

In buildings, structures, municipal roads and other projects, generally need to first backfill soilreinforcement, commonly used processing methods mainly include the following:

1,Dynamic compaction

That is, the strong compaction method, also known as the dynamic consolidation method, is the use of largeCrawler type crane will8~40Tons of heavy hammer from6~40It falls freely at meter height and compacts the earth strongly. It is suitable for artificial filling, collapsible soil and loess.

2, vibration rolling

Vibratory rolling is a foundation treatment process which compacts the soil repeatedly under the action of the dead weight and vibration force of vibratory roller. Generally, it requires layering backfilling and layering compaction.

3, composite foundation

Composite foundation contains many processes, commonly used in the form of cement soil mixing pile, high-pressure rotary jet grouting pile, ash soil compaction pile, gravel pile, etc., is to add cement or ash soil, gravel and other building materials in the loose and weak soil layer, so that the soft soil can be strengthened, the loose soil can be compact, so as to achieve the purpose of reinforcement.

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