基于变时基弹性锤击技术的基桩承载力评估试验研究  

Experimental Study on the Evaluation of Pile Bearing Capacity Based on Elastic Hammering Technique of Variable Time Base

作　　者：叶东昌 卞德存 孙晓立 杨军 邵继喜 赵亚宇 YE Dong-chang;BIAN De-cun;SUN Xiao-i;YANG Jun;SHAO Ji-xi;ZHAO Ya-yu(Guangzhou Municipal Engineering Testing Co.,Ltd.,Guangzhou 510520;Guangzhou Construction Co.,Ltd.,Guangzhou 510030)

机构地区：[1]广州市市政工程试验检测有限公司,广州510520 [2]广州建筑股份有限公司,广州510030

出　　处：《广州建筑》2023年第4期53-56,共4页GUANGZHOU ARCHITECTURE

基　　金：广东省住房和城乡建设厅科学技术计划项目(2022-K26-503115);广州市建筑集团有限公司科技计划项目(2021-KJ010、2021-KJ054、2023-KJ011)。

摘　　要：针对现有基桩承载力检测方法不足,对瞬态机械阻抗法基桩检测技术进行了改进:利用变时基导纳分析技术,对脉冲激励与振动响应信号进行采集处理,提高信号信噪比及时频域分辨率;采用带弹簧结构的激振力锤,大幅提高锤击时的荷载作用时间,增强低频响应信号。通过对含缺陷模型桩的测试试验,可以发现:基于变时基弹性锤击技术的动刚度测试方法可获得稳定的动刚度数值,动刚度值的大小基本上体现了桩身内部缺陷严重情况,可以很好地反映基桩的承载力特性。In view of the insufficiency of the existing detection methods of pile bearing capacity,the transient mechanical impedance method is improved:the impulse excitation and vibration response signals are collected and processed by using the time-varying admittance analysis technology,so as to improve the signal to noise ratio and frequency domain resolution;The vibration hammer with spring structure is adopted to greatly increase the load acting time and enhance the low-frequency response signal.Through the test of the pile with defects model,it can be found that the dynamic stiffness test method based on the time-varying elastic hammer-hammer technology can obtain the stable dynamic stiffness value,and the dynamic stiffness value basically reflects the serious internal defects of the pile,and can well reflect the bearing capacity characteristics of the pile.

关 键 词：机械阻抗法 动刚度 基桩承载力 变时基 

分 类 号：TU473.1[建筑科学—结构工程]