Dynamic compaction machine is a kind of machine for loose soil compaction in construction engineering. It is often used for treatment. There are many types of dynamic compaction machine, including frog type, vibrating type, step type, ramming type and hanging hammer type. According to the needs of engineering, different types of dynamic compaction machine are used.

建设项目一般预估耗费的动力要比实践需求的量大，这样就会糟蹋掉许多。强夯地基处理技能能杜绝这种现象，在施工处理过程中，所用到的填料很少。并且填料的类型来历十分便利，能充沛用到周边的污染物质。这样就明显提高了减排的效率。

Generally, the estimated power consumption of construction projects is larger than the practical demand, which will waste a lot. Dynamic compaction foundation treatment skills can eliminate this phenomenon, in the construction process, the use of filler is very few. And the type of filler is very convenient, can make full use of the surrounding pollutants. This will significantly improve the efficiency of energy conservation and emission reduction.

强夯置换是强夯用于加固饱和软粘土地基的方法。强夯置换法的加固机理与强夯法不同，它是利用重锤高落差产生的高冲击能将碎石、片石、矿渣等性能较好的材料强力挤入地基中，在地基中形成一个一个的粒料墩，墩与墩间土形成复合地基，以提高地基承载力，减小沉降。

Dynamic compaction replacement is a method of dynamic compaction used to reinforce saturated soft clay foundation. The reinforcement mechanism of dynamic compaction replacement method is different from that of dynamic compaction method. It uses the high impact energy produced by the high drop of heavy hammer to force the gravel, rubble, slag and other materials with good performance into the foundation, forming a granular material pier in the foundation, and forming a composite foundation between the pier and the soil between the piers, so as to improve the bearing capacity of the foundation and reduce the settlement.

在强夯置换过程中，土体结构破坏，地基土体产生超孔隙水压力，但随着时间的增加，土体结构强度会得到恢复。粒料墩一般都有较好的透水性，利于土体中超孔隙水压力消散产生固结。

In the dynamic compaction replacement process, the soil structure is destroyed, and the foundation soil produces excess pore water pressure, but with the increase of time, the soil structure strength will be restored. Generally, granular pier has good permeability, which is conducive to the dissipation of excess pore water pressure in soil and consolidation.

土体加固深度不只反映了地基处理效果的重要参数，强夯机夯多大面积，而且是地基处理计划的重要依据，在强夯法中，有用加固深度不只是上部结构根底设计的主要依据，而且是对强夯夯击能量的确认。

The depth of soil reinforcement not only reflects the important parameters of foundation treatment effect, but also is the important basis of foundation treatment plan. In the dynamic compaction method, the useful reinforcement depth is not only the main basis of superstructure foundation design, but also the confirmation of dynamic compaction energy.