动刚度在基桩检测中的运用  

Dynamic Stiffness Application in Foundation Piles Testing

作　　者：胡新发[1,2] 柳建新[1] 

机构地区：[1]中南大学地球科学与信息物理工程学院,长沙410083 [2]永州市建设工程质量安全监督站,湖南永州425006

出　　处：《桂林理工大学学报》2011年第4期564-569,共6页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(60672042);湖南省高校科技创新团队项目(2008-244)

摘　　要：针对反射波法测桩局限性,用频率-初速度法测量桩的动刚度。将桩的动刚度用于区分夯扩沉管灌注桩中上部绝对缩颈和相对缩颈,间接反映夯扩头的大小,为选择静载试验桩提供依据。通过与同条件下正常桩的反射波曲线及动刚度对比,当反射波曲线异常或动刚度明显偏低时,桩底部完整性、沉渣厚度或桩端持力层性状异常。通过对比缺陷桩加固前后的反射波曲线和动刚度值,并将其与其他同条件下正常桩对比,可检验缺陷桩的加固效果。By means of comparing the reflected curve and the dynamic stiffness with those of perfect piles under the same conditions,abnormalities of the reflected wave curve or of obvious low dynamic stiffness would be found from the concrete defect in the lower pile,from the bottom sediment thickness or the characters of pile bearing stratum.Through investigating the changes of the reflected curve and the dynamic stiffness before and after reinforcement and comparing the reflected curve and the dynamic stiffness after reinforcement with those of perfect piles under the same conditions,the reinforcement effect can be inspected.

关 键 词：基桩检测 动刚度 持力层性质 缺陷 加固效果 

分 类 号：TU473.1[建筑科学—结构工程]