基于孔内地震波测试的桩基完整性检测试验研究  

Experimental research on pile foundation integrity detection based on borehole seismic wave testing

作　　者：史永强 孙晓立 杨军 庞光辉 杜永潇 SHI Yongqiang;SUN Xiaoli;YANG Jun;PANG Guanghui;DU Yongxiao(Liaoning Municipal Engineering Design and Research Institute Co.,Ltd.,Shenyang 110055,China;Guangzhou Municipal Engineering Testing Limited Company,Guangzhou 510520,China)

机构地区：[1]辽宁省市政工程设计研究院有限责任公司,辽宁沈阳110055 [2]广州市市政工程试验检测有限公司,广东广州510520

出　　处：《混凝土》2024年第10期160-166,共7页Concrete

摘　　要：针对传统桩基无损检测方法在实际应用中的局限性,提出一种桩基完整性孔内地震波测试方法,开展足尺模型试验和工程实例分析,验证了该方法用于桩基完整性检测的可行性。分析结果表明:孔内地震波法能有效识别桩身断裂、夹泥等缺陷,对于混凝土胶结差等轻微缺陷的判别则相对困难;针对桩身局部断面混凝土质量缺陷,通过变换桩顶激振位置,在桩身内部形成多条应力波传递路径,能准确判别桩身缺陷分布位置;与传统平行地震波法相比,孔内地震波法结果基本不受桩周土层性质、桩-孔测试距离等因素影响,判别结果更加理想。In response to the limitations of traditional pile foundations non-destructive testing methods in practical applications,a borehole seismic wave testing method for pile foundation integrity detection was proposed.The full-scale model test and engineering case analysis were conducted,and the feasibility of using this method for pile foundation integrity detection was verified.The analysis results indicate that the borehole seismic wave method can effectively identify defects such as pile fractures and mud inclusions,but it is relatively difficult to distinguish minor defects such as poor concrete bonding.In response to the concrete quality defects in the local section of the pile body,by changing the excitation position on the top of the pile,multiple stress wave transmission paths are formed inside the pile body,which can accurately determine the distribution position of the pile body defects.Compared with the traditional parallel seismic wave method,the results of the borehole seismic wave method are basically not affected by factors such as the properties of the soil layer around the pile and the distance between the pile and the hole,and the discrimination results are more ideal.

关 键 词：桩基 完整性检测 孔内地震波法 缺陷识别 模型试验 

分 类 号：TU528.07[建筑科学—建筑技术科学]