Heavy hammer compaction is a kind of dynamic compaction, which is basically the same, and the compaction energy is different; The ramming energy of heavy hammer is lower than that of dynamic ramming; At 1000KN M boundary. The tamping energy is not an order of magnitude, so the reinforcement mechanism is different. Heavy hammer compaction is the reinforcement of shallow soil, which belongs to the compaction mechanism; The dynamic compaction method is the reinforcement of deep soil, mainly the mechanism of dynamic consolidation and dynamic compaction.

1、重锤夯实法

1. Heavy hammer compaction method

该法是将重约15～30KN的夯锤提升到4m以上的高度，使其脱钩自由落下，反复击实地基，达到加固效果。

This method is to lift the rammer weighing about 15 ~ 30KN to a height of more than 4m, make it decouple and fall freely, and repeatedly compact the foundation to achieve the reinforcement effect.

此法适用于地下水位低于重锤夯实法加固粘性土、砂土、杂填土等地基，不适用于饱和软粘土或地下水位以下的粘性土。

This method is applicable to the consolidation of cohesive soil, sandy soil, miscellaneous fill and other foundations with the groundwater level lower than the heavy hammer compaction method, and is not applicable to saturated soft clay or cohesive soil below the groundwater level.

施工时应特别注意土的含水率变化。

During construction, special attention shall be paid to the change of soil moisture content.

2、强夯法

2. Dynamic compaction method

此法是用特别重的夯锤(100～300KN)从高处(6～40m)自由落下，对地基进行强有力夯击，达到深加固的效果，其影响深可达10m以上，巨大的冲击力量在地基中产生很大的冲击波和动应力，引起地基土的压缩和振密，从而提高地基土的强度并降低其压缩性，还可让地基土抵抗振动液化能力和解决湿陷性黄土的湿陷性等作用。经强夯法处理的地基，承载力可提高，压缩性降低。

This method is to use a particularly heavy rammer (100 ~ 300KN) to fall freely from a height (6 ~ 40m) to tamp the foundation, so as to achieve the effect of deep reinforcement. Its influence depth can reach more than 10m. The huge impact force produces great shock wave and dynamic stress in the foundation, causing the compression and vibration density of the foundation soil, so as to improve the strength of the foundation soil and reduce its compressibility, It can also make the foundation soil resist vibration liquefaction and solve the collapsibility of collapsible loess. The bearing capacity of the foundation treated by dynamic compaction method can be improved and the compressibility can be reduced.

一般用于处理松散的碎石土、杂填土、砂土，低饱和度的粉土、粘土、湿陷性黄土;在高饱和度的细粒土地基上应慎重使用。

It is generally used to treat loose gravelly soil, miscellaneous fill, sandy soil, low saturation silt, clay and collapsible loess; It should be used carefully on fine-grained soil foundation with high saturation.

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