Abstract:Dynamic compaction was widely used to reinforce the collapsible loess foundation. But in urban areas or compression building areas,the vibration caused by this construction method may be effects the comfortableness of residents or damages the adjacent building structures. In this paper,the effect of vibration was tested to improve dynamic loess foundation with dynamic compaction in a typical collapsible loess site. The attenuation regularity of vibration wave in the ground of collapsible loess was concluded with regression method,and the influence on the adjacent buildings and the comfortableness of human body was analyzed. At the same time,the reasons and conditions of vibration-subsidence were analyzed. These results and regularities are compared with those of down hole dynamic compaction (DDC). The results of experiment and analysis demonstrate that the vibration caused by dynamic compaction is tremendous,but it¢s a swift attenuation;and it may influence the adjacent buildings and comfortableness of human body in some boundary,and may lead collapsible loess to vibration subsidence when the energy is high enough. So the effect of vibration on adjacent buildings and comfortableness of residents need to be paid attention to;and the construction parameters need to be controlled when constructing in urban areas or compression building areas.