Before dynamic compaction, one or several test areas should be selected on the representative site of the construction site for trial compaction or trial construction. The number of test areas should be determined according to the complexity of construction site, construction scale and building type.

在每次强夯前在土基上铺设碎石垫层的原因

Reasons for laying gravel cushion on soil foundation before each dynamic compaction

增大地下水与夯坑底部间的高差，从而有效避免夯坑侧面与底部在强夯作用下出现翻浆，确保良好的强夯效果

Increase the height difference between the groundwater and the bottom of the tamping pit, so as to effectively prevent the side and bottom of the tamping pit from boiling under the action of dynamic compaction, and ensure good dynamic compaction effect

由于碎石材料自身具有较高的强度，因此，作为垫层时，能够有效增大表层地基强度，抵制过湿土地基反弹，有效改善强夯效果

Because of the high strength of gravel material, as cushion, it can effectively increase the strength of surface foundation, resist the rebound of over wet soil foundation, and effectively improve the dynamic compaction effect

垫层也可作为应力扩散层，使得饱和软土局部受力均匀，增大对软土地基的有效作用面积，也便于夯击动力传递深层

The cushion can also be used as a stress diffusion layer, which makes the saturated soft soil stress uniform, increases the effective area of soft soil foundation, and facilitates the transfer of tamping power to the deep layer

在强夯过程中，碎石垫层与过湿土地基接触，明显扩充了排水路径，改善排水环境，也有利于消散地基上部孔隙水压力

In the process of dynamic compaction, the gravel cushion is in contact with the over wet soil foundation, which obviously expands the drainage path, improves the drainage environment, and also helps to dissipate the pore water pressure in the upper part of the foundation

碎石垫层能够保证强夯设备和辅助机械在饱和软土上得到稳定的支撑，以保证正常施工

Gravel cushion can ensure that dynamic compaction equipment and auxiliary machinery can get stable support on saturated soft soil to ensure normal construction

上面是强夯的相关事项，希望能对您有所帮助，更多强夯机的相关内容请关注：http://www.sddhfjx.cn

The above is about dynamic compaction. I hope it can be helpful to you. For more information about dynamic compaction, please pay attention to: http://www.sddhfjx.cn