锤击沉桩引起的周围土体振动分析研究  

Analysis of Surrounding Soil Vibration Caused by Driven Piles Using Impact Hammer

作　　者：黄慧 武广繁 代登辉 Huang Hui;Wu Guangfan;Dai Denghui(Jiangsu Electric Power Design Institute Co.,Ltd.,China Energy Engineering Group,Nanjing 211102,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]中国能源建设集团江苏省电力设计院有限公司,南京211102 [2]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098

出　　处：《特种结构》2024年第6期80-85,共6页Special Structures

摘　　要：预制桩锤击沉桩常引起周围土体振动,这些振动会对周边建筑物造成不同程度影响。本文针对该问题,依托某2×100万kW机组扩建项目,针对场地某43m桩锤击沉桩过程进行了全过程振动监测。利用三轴测振仪实测了锤击沉桩引起的桩周土体径向、切向和竖向的振动加速度,分析了桩周土体的振动衰减特性,同时得到了不同离桩位置处土体振动随桩基入土深度的变化情况,并绘制出峰值加速度云图,进一步揭示了桩周土体随桩基入土深度及离桩距离变化的振动规律。结果发现桩周土体的振动呈波动衰减的趋势。Soil vibrations caused by driven piles using impact hammer can affect nearby buildings to varying degrees.To address this issue,through a 2 x1000MW unit expansion project,the full-process vibration of a 43-meter pile in site was monitored.Using a triaxial vibrometer,the radial,tangential,and vertical vibration accelerations of the soil surrounding the pile were measured.The attenuation characteristics of soil vibration around the pile were analyzed.The variation of soil vibration at different distances from the pile as the depth increased was observed and visualized through peak acceleration contour maps.The study further revealed the vibration patterns of the soil surrounding the pile in relation to pile depth and distance from the pile.Results showed a trend of oscillatory attenuation in the soil vibration around the pile.

关 键 词：预制桩 锤击沉桩 振动 峰值加速度 

分 类 号：TU473.1[建筑科学—结构工程]