强夯振动衰减规律分析及安全距离预测研究

Analysis on Vibration Attenuation Law and Safety Distance Prediction

某高速公路路基存在厚度较大的湿陷性黄土,需采用强夯法进行加固,但作业区邻近一座钢筋混凝土蓄水池,强夯所产生的振动效应可能会损坏蓄水池的结构。为确定安全的施工距离,文中设置了四个夯击点和四条测线,并利用振动传感器检测土体的振动速度峰值,进而根据监测数据分析强夯振动衰减规律,发现夯击能量的衰减速度先快后慢,并且在前期呈指数衰减,再根据萨道夫斯基公式建立振动速度峰值与安全距离的关系,计算得出夯击施工的理论安全距离。

There is a thick collapsible loess in the roadbed of a certain expressway,which needs to be reinforced by dynamic compaction.However,the working area is adjacent to a reinforced concrete reservoir,and the vibration effect generated by dynamic compaction may damage the structure of the reservoir.In order to determine the safe construction distance,four compaction points and four measuring lines were set up during the research process.Vibration sensors were used to detect the peak vibration velocity of the soil,and the attenuation law of dynamic compaction vibration was analyzed based on monitoring data.It was found that the attenuation rate of compaction energy was first fast and then slow,and exhibited exponential attenuation in the early stage.Based on the Sadovsky formula,establish the relationship between the peak vibration velocity and the safe distance,and calculate the theoretical safe distance for compaction construction.