Dynamic compaction refers to the use of lifting equipment to lift the rammer to a certain height, and then use automatic decoupling to release the heavy hammer to make it fall freely. Its kinetic energy exerts great impact energy on the foundation soil, forming shock wave and dynamic stress in the foundation soil, and improving the strength of the foundation.

强夯一般采用先点夯后满夯的方法，地基土经点夯后，承载力提高，zui后采用小夯击能满夯，使整个场地浅表层又得到加固。

Dynamic compaction generally adopts the method of point compaction first and then full compaction. The bearing capacity of foundation soil is improved after point compaction, and full compaction can be achieved by small tamping after Zui, so that the shallow surface layer of the whole site is reinforced.

强夯可以使土体结构发生显著变化，地基土重新固结，降低土的压缩性，改善其抗液化能力，消陷性等，从而提高土层的均匀程度，减少将来可能出现的差异沉降。强夯的影响深度通常在4米以上，随着夯击能增大，有效处理深度增加，zui大可达10米左右。

Dynamic compaction can cause significant changes in soil structure, re consolidation of foundation soil, reduction of soil compressibility, improvement of liquefaction resistance and elimination of collapsibility, so as to improve the uniformity of soil layer and reduce the possible differential settlement in the future. The influence depth of dynamic compaction is usually more than 4 meters. With the increase of tamping energy, the effective treatment depth increases, and the Zui can reach about 10 meters.

强夯施工方法

Dynamic compaction construction method

强夯施工时一般行高能级点夯，点夯完成后，再进行低能级的满夯。强夯的能级是夯锤重量与夯锤落下高度的乘积。工程中常用的点夯能级为1000KNm-5000 KNm之间，常用的满夯能级为500-1000 KNm。

In dynamic compaction construction, high-energy point compaction is generally carried out first, and then full compaction of low-energy level is carried out after point compaction. The energy level of dynamic compaction is the product of rammer weight and rammer falling height. The commonly used energy level of point ramming is between 1000 knm and 5000 knm, and the commonly used full compaction energy level is 500-1000 knm.

点夯分连续点夯和间隔点夯，连续点夯是按照设计图纸的夯点布置图逐一进行点夯，间隔点夯是分两遍进行隔点点夯。夯点的布置形状有三角形、梅花形、正方形等，单点夯击次数通常根据现场试验确定，且必须保证zui后两击的夯沉量不大于设计要求，一般要求为5cm。点夯完成后再进行满夯，满夯必须保证夯点之间的搭接不小于1/4夯锤，以保证基础表面整体的密实度。

Point compaction is divided into continuous point compaction and interval point compaction. Continuous point compaction is to carry out point compaction one by one according to the layout of tamping points in the design drawing, and interval point compaction is divided into two times of interval point compaction. The layout shapes of tamping points include triangle, plum blossom, square, etc. the number of tamping at a single point is usually determined according to the field test, and the tamping settlement after Zui shall not be greater than the design requirements, and the general requirement is 5cm. After the completion of point compaction, full compaction shall be carried out, and the overlap between tamping points shall not be less than 1 / 4 rammer to ensure the overall compactness of foundation surface.