作者：王奎华^1,2, 于喆^1,2, 项驰轩^1,2, 吴君涛^1,2, 邱欣晨^1,2

作者单位：1. 浙江大学 滨海和城市岩土工程研究中心，浙江 杭州 310058;
2. 浙江大学 软弱土与环境土工教育部重点实验室，浙江 杭州 310058

关键词：桩基础;无损测试;声波透射法;测管弯斜;有限元分析

摘要：

桩基声测管倾斜会使得桩身混凝土超声波波速计算结果出现误差，影响桩身质量检测结果，为此提出一种一发三收式声波透射检测技术。该技术通过固定各声波接收换能器的间距，根据几何关系，使用检测得到的超声波声时和接收换能器的间距，即可计算得到桩身混凝土超声波波速，使其不再依赖于超声波发射端和接收端的间距，也不再需要拟合声测管管身曲线。通过有限元软件模拟接收换能器间距和声测管倾斜程度对检测结果精度的影响，结果表明该技术可以良好地适应超声波接收换能器间距和声测管倾斜斜率的变化，稳定保持较高的波速计算精度，解决声测管倾斜、偏位时造成的声速计算误差。

One-launcher-three-receiver sonic logging technique for pile foundation and its numerical simulation analysis
WANG Kuihua^1,2, YU Zhe^1,2, XIANG Chixuan^1,2, WU Juntao^1,2, QIU Xinchen^1,2
1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
2. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310058, China
Abstract: The incline of pile foundation acoustic tube will cause errors of calculation result of ultrasonic wave velocity of pile concrete, which will affect the test result of pile quality, therefore we proposed a one-launcher-three-receiver sonic logging technique. In this technique, the ultrasonic wave velocity of pile concrete can be calculated by fixing the spacing of each acoustic wave receiving transducer and using the measured ultrasonic sound time and the spacing values of the receiving transducers according to the geometric relationship, so that it will no longer be relied on the spacing values between the ultrasonic transmitting end and the receiving end, or fitting the acoustic tube body curve. Using finite element software to simulate the influence the receiving transducer spacing and the acoustic tube inclination on the accuracy of the testing results, shows that the technique can well adapt to the change of the ultrasonic transducer spacing and acoustic tube inclination, and stably maintain high accuracy of wave velocity calculation, and solve the sound velocity calculation error caused by the inclination and deviation of the acoustic tube.
Keywords: pile foundation;non-destructive test;sonic logging method;bent acoustic pipe;FEA
2023, 49(1):1-6  收稿日期: 2022-01-12;收到修改稿日期: 2022-03-21
基金项目: 浙江省自然科学基金资助项目(LXZ22E080001)；国家自然科学基金资助项目(51779217， 52178358， 52108349)； 中央高校基本科研业务费专项资金资助(2020QNA4027)
作者简介: 王奎华(1965-),男,江苏滨海市人,教授,博导,从事桩基振动理论及土工测试方法的研究
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