The impact of the vibration of the dynamic compaction equipment on the construction results and dynamic compaction process parameters, as well as the surrounding structures may be related to the soil structure.
Under the action of strong tamping energy, the center of tamping point with the tamping hammer as the center sinks rapidly, and the accumulated settlement can reach more than 1m, and the soil structure around the tamping pit will arch up due to the effect of external force. Of course, the deformation of foundation soil will have a bad influence on the surrounding buildings.
The impact energy exerted by the rammer on the ground is transmitted in the half space of the elastic body of the foundation in the form of oscillation wave, which changes the physical and mechanical properties of the soil. The body wave propagates radially along a hemispherical wave front. The longitudinal wave makes the soil under tension and pressure, which can increase the pore water pressure and lead to the collapse of soil skeleton. This kind of shaking has no effect on the compaction of the foundation, but it has a large oscillation on the building, which is harmful wave.
From the above analysis principle, it is not difficult to see that the compaction of the foundation soil and the slack deformation of the surface layer are caused by the effect of the shock wave, and then the deformation of the foundation soil is caused. The deformation of the foundation soil must affect the safety of the surrounding buildings.
Before construction, check the weight and scale of rammer, drop distance control means, drainage equipment and soil quality of rammed foundation. In order to avoid the impact of dynamic compaction vibration on the surrounding equipment, the nearby buildings must be investigated before construction, and corresponding anti vibration or vibration isolation measures shall be taken when necessary, with the impact range of about 10-15m. During the construction, the adjacent buildings should be rammed and moved to the distance gradually. During the construction, the drop distance, tamping times, tamping point position and tamping range should be checked.