The dynamic compaction method is one of the better foundation treatment methods. At present, the dynamic compaction method has been developed to reinforce the foundation soil in large area, up to 30 m. In the case of saturated cohesionless soil, liquefaction may occur. In the process of tamping, the instantaneous settlement of the soil can reach tens of centimeters. After liquefaction, the soil structure will be destroyed, and the strength of the soil will be reduced to a small value. Then, radial cracks will appear around the tamping point, which will become the main channel to accelerate the dissipation of pore water pressure It is restored and enhanced.

另外，强夯后所导致砂性土的液化，能够降低地基在未来地 震作用下的液化势。虽然地基土的密度增加不多，但却能减少在未来地 震作用下发生液化的可能性。

In addition, the liquefaction of sandy soil caused by dynamic compaction can reduce the liquefaction potential of foundation under the action of future earthquake. Although the density of foundation soil increases little, it can reduce the possibility of liquefaction under the action of future earthquake.

强夯法在实践中已被证实是一种较好的地基处理方法之一，该方法的提出是在第十届国际土力学和基础工程会议上。具体说明了强夯法的发展程度，该法可适用于30 m范围内的大面积地基土的加固。

The dynamic compaction method has been proved to be one of the better foundation treatment methods in practice. It was proposed at the 10th International Conference on soil mechanics and foundation engineering. The development degree of dynamic compaction method is explained in detail. The method can be applied to the reinforcement of large area foundation soil within 30 m.

如果操作环境为非饱和土，则压密可达到实验室的击实试验效果。如果操作环境为饱和无粘性土，反应过程中可能有液化效应，其效果亦有相关报道和试验佐证。同爆 破法或者是振动法的反映过程类似。在对杂填土的过程中运用强夯法是非常有用的，尤其是需要破坏土质的结构，构造因孔隙水压而诞生的排水通道时，效果尤其显著。

If the operating environment is unsaturated soil, compaction can achieve the effect of laboratory compaction test. If the operating environment is saturated cohesionless soil, liquefaction effect may occur in the reaction process, and the effect has been confirmed by relevant reports and tests. The reaction process is similar to that of blasting method or vibration method. It is very useful to use dynamic compaction method in the process of miscellaneous fill, especially when the soil structure needs to be destroyed and the drainage channel is constructed due to pore water pressure.

在具体的工程施工当中，不管是怎样的复杂土质，一旦施加夯击，必定造成地基的剧烈反应以沉降，这种现象在粒性土质下，尤为明显。国际上认为，饱和细粒土质，在评估其沉降范围时务必要考虑其孔隙水的排出能力。传统意义的固结理论中，我们把这当作是必要充分条件。

In the specific engineering construction, no matter what kind of complex soil, once the ramming is applied, it will inevitably cause the violent reaction and even settlement of the foundation. This phenomenon is especially obvious under the granular soil. It is considered internationally that the drainage capacity of pore water must be considered when evaluating the settlement range of saturated fine-grained soil. In the traditional consolidation theory, we regard it as a necessary and sufficient condition.

因饱和细粒土质自身渗 透性低的特质，决定了孔隙水无法及时排出，在瞬间荷载作用时，未必能立即引起巨大沉降效果。 有关数据表明，土壤中的有 机物分 解反应，造成微气泡增加，据实际测算，第四纪土的含气量约在1%～4%之间，在实行强夯法的过程中，气体体积减小，孔隙压力下降，每次总体积可下降40%。

Due to the low permeability of saturated fine-grained soil, the pore water can not be discharged in time, and the huge settlement effect may not be caused immediately under the action of instantaneous load. According to the actual calculation, the gas content of Quaternary soil is about 1% - 4%. In the process of dynamic compaction, the volume of gas decreases and the pore pressure decreases, and the total volume of each time can be reduced by 40%.

强夯法实行过程中，土体的受压不断增加，因此气体的体积不断收缩。从数据上看，土面的沉降度与夯击的力度是成正比的。知道气体的体积下降能力接近于零时，土面沉降基本不会再有所变化，此时孔隙水在受压的情况下，水压与液化压达到一定比例，此时液化压力转化为覆盖压力，这个数值达到100%，土面介于正常和液化的临界点。这时的能 量值，学术上则称之为饱和能 量值。原本的吸附水转化为自由水，伴随着土面强度的不断下降，达到饱和，破坏土起的重 塑能力。

In the process of dynamic compaction, the pressure of soil is increasing, so the volume of gas is shrinking. From the data, the settlement of soil surface is directly proportional to the tamping force. It is known that when the volume reduction capacity of gas is close to zero, the settlement of soil surface will not change any more. Under the condition of pressure of pore water, the water pressure and liquefaction pressure reach a certain proportion. At this time, the liquefaction pressure is transformed into cover pressure, which reaches 100%. The soil surface is between the critical point of normal and liquefaction. The energy value at this time is called the saturation energy value. When the original adsorbed water is converted into free water, the strength of the soil surface decreases and reaches saturation, which destroys the remolding ability of the soil.