Method for Identifying the Grout Defects of the Anchors at Ultra-Early-Stage Based on Time-Domain Waveform Characteristic Reflection Points

IF 0.9 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
Bing Sun, Cong Zhu, Junhui Zou, Shanyong Wang, Sheng Zeng
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引用次数: 0

Abstract

Anchors constitute a common form of structural support in geotechnical engineering. Precise identification of ultra-early-stage (UES) anchoring quality is crucial to ensure the integrity of the secondary lining. To address grout defects in the UES of anchors, a calculation method for UES anchor wave velocity was introduced. Indoor experiments and numerical simulations were conducted for non-destructive testing (NDT) of anchors in the UES, analyzing time-domain waveform characteristics and wave velocity variations. A method for identifying grout defects in the UES of anchors was proposed. The results indicate that the proposed wave velocity calculation method offers a more precise estimation of UES wave velocity for anchors compared to the traditional approach. This enhancement enables a more precise evaluation of the development of solid phases in the anchoring medium. As the solid phase develops, the wave velocity and first wave amplitude of the anchor gradually decline, while the response time of the bottom reflection increases. Grout defects lead to amplified amplitudes in both time-domain and frequency-domain signals, accompanied by a heightened occurrence of peaks in the frequency domain. The waveform distortion region before the bottom reflection is caused by grout defects. In the time-domain signals of defective anchors, a waveform distortion region is observed before the bottom reflection. By assessing the magnitude of the absolute value of the ratio between the amplitude of characteristic reflection points within the distortion region and the amplitude of the first wave, effective identification of grout defects in the UES of anchors can be accomplished.

Abstract Image

Abstract Image

基于时域波形特征反射点的超早期锚固件灌浆缺陷识别方法
摘要锚杆是岩土工程中一种常见的结构支撑形式。精确识别超早期(UES)锚固质量对于确保二次衬砌的完整性至关重要。为解决锚杆超早期阶段的灌浆缺陷,引入了超早期阶段锚杆波速的计算方法。对 UES 中锚杆的无损检测(NDT)进行了室内实验和数值模拟,分析了时域波形特征和波速变化。提出了一种识别锚杆 UES 中灌浆缺陷的方法。结果表明,与传统方法相比,所提出的波速计算方法能更精确地估算锚杆的 UES 波速。这种改进能够更精确地评估锚固介质中固相的发展。随着固相的发展,锚杆的波速和第一波振幅会逐渐下降,而底部反射的响应时间则会增加。灌浆料缺陷会导致时域和频域信号的振幅放大,同时频域的峰值也会增加。底部反射前的波形畸变区域是由灌浆缺陷造成的。在有缺陷锚杆的时域信号中,可以观察到底部反射前的波形畸变区域。通过评估畸变区域内特征反射点振幅与第一波振幅之比绝对值的大小,可以有效识别锚固件 UES 中的灌浆缺陷。
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来源期刊
Russian Journal of Nondestructive Testing
Russian Journal of Nondestructive Testing 工程技术-材料科学:表征与测试
CiteScore
1.60
自引率
44.40%
发文量
59
审稿时长
6-12 weeks
期刊介绍: Russian Journal of Nondestructive Testing, a translation of Defectoskopiya, is a publication of the Russian Academy of Sciences. This publication offers current Russian research on the theory and technology of nondestructive testing of materials and components. It describes laboratory and industrial investigations of devices and instrumentation and provides reviews of new equipment developed for series manufacture. Articles cover all physical methods of nondestructive testing, including magnetic and electrical; ultrasonic; X-ray and Y-ray; capillary; liquid (color luminescence), and radio (for materials of low conductivity).
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