低应变反射波法在既有基桩完整性检测中的应用研究  

Analysis of the Application of Low Strain Reflected Wave Method to Integrity Testing of Foundation Piles with Existing Superstructures

作　　者：林伟 冯卓轩 余福宝 徐明江 刘春林 LIN Wei;FENG Zhuo-xuan;YU Fu-bao;XU Ming-jiang;LIU Chun-lin(Guangzhou Testing Centre of Construction Quality and Safety Co.,Ltd.,Guangzhou 510440;Guangzhou Construction Co.,Ltd.,Guangzhou 510030)

机构地区：[1]广州建设工程质量安全检测中心有限公司,广州510440 [2]广州建筑股份有限公司,广州510030

出　　处：《广州建筑》2023年第2期25-28,共4页GUANGZHOU ARCHITECTURE

基　　金：广州建筑集团科技计划项目(2020-KJ002、2020-KJ007、2021-KJ007);广州建科院科技计划项目(2021Y-KJ04、2022Y-KJ01)。

摘　　要：针对既有结构基桩完整性问题,采用低应变反射波法进行现场试验研究。结合低应变法基本原理、现场环境、作业方法及干扰信号来源,探讨了桩顶、桩侧1倍和2倍桩径处的桩身完整性检测信号。结果表明:在桩顶激振时,桩侧安装传感器比在桩顶安装可有效减弱上部结构的干扰,且桩侧2倍桩径位置安装传感器比1倍桩径位置处能更准确估算桩长和消除局部干扰信号,证明了低应变反射波法在既有结构基桩完整性检测具有可靠性和适用性。In order to investigate the integrity of foundation piles with existing superstructures,the field test is carried out by using the low strain reflected wave method.Combined with the basic principle of low strain reflected wave method,field environment,operation method and interference signal source,the integrity detection signals at the pile top and at the pile side are discussed.The results show that when the pile top is excited,the sensor installed at the pile side can effectively reduce the interference of the superstructure compared with the sensor installed at the pile top,and the sensor installed at the double pile diameter below the pile top can more accurately estimate the pile length and eliminate local interference signals than at the position of one pile diameter.It is proved that the low strain reflected wave method is reliable and applicable in the integrity detection of existing structural foundation piles.

关 键 词：低应变反射波法 既有结构基桩 完整性检测 

分 类 号：TU452[建筑科学—岩土工程]