Non-destructive test method of rock bolt based on D-S evidence and spectral kurtosis

Sun, Xiaoyun; Zheng, Haiqing; Wang, Zhiyuan; Bian, Jıanpeng; Xing, Hui; Wang, Mingming

doi:10.1504/ijcat.2018.091640

Cited by 3 publications

(1 citation statement)

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“…To mitigate the influence of environmental and equipment noise on the detection results, several signal processing methods have been proposed for anchor rods NDT. These methods include Fourier transform (FFT) [3], wavelet filtering [4,5], variational mode decomposition-Hilbert Huang transform (VMD-HHT) [6], empirical mode decompositionspectral kurtosis denoising [7], HHT [8], AILPSA [9], grey cloud model [10], etc. Among them, FFT and wavelet filtering are earlier and widely applied signal processing methods.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the dynamic characteristics of anchor rods considering size effect and pull-out loads based on IIR-FDM

Sun,

Zhu,

Song

et al. 2024

Meas. Sci. Technol.

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When the surrounding rock of tunnel anchor bars has boundaries, the signals obtained from NDT of anchor rods will be simultaneously affected by size effects and pull-out loads, leading to potential misinterpretation of the test results. In order to accurately assess the anchorage quality of anchor rods under this interference, NDT and numerical simulations of anchor rods subjected to different anchorage quality were conducted under the influence of size effects and pull-out loads. A signal filtering method, which combines the infinite impulse response-finite difference method , was proposed for identify the impact of size effects. The study analyzed the variations in wave velocity and fundamental frequency of anchor rods with anchorage defects and intact anchor rods under the influence of size effects and pull-out loads. The results indicate that the IIR-FDM method, in comparison to the traditional wavelet method, provides better agreement between the calculated wave velocities and existing findings. With the increase of size effect, the wave velocity and amplitude ratio of the anchor rods decrease, and the fundamental frequency increases first and then decreases. As the working load on the anchor rods increases, the wave velocity initially decreases, then rises, while the fundamental frequency initially increases and then experiences a slight decrease. The presence of anchorage defect results in an increase in the wave velocity and amplitude ratio of the anchor rods, while causing a decrease in the fundamental frequency. This effect of defects on wave velocity and fundamental frequency is more pronounced at lower loads. The wave velocity after IIR-FDM processing has a small error with the simulated wave velocity, indicating the reliability of the processing method.

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Section: Introductionmentioning

confidence: 99%

Investigation on the dynamic characteristics of anchor rods considering size effect and pull-out loads based on IIR-FDM

Sun,

Zhu,

Song

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

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

Sun,

Zhu,

Zou

et al. 2023

Russ J Nondestruct Test

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Characterization of Deformation of Bolts and Induced Stress Wave Propagation under Axial Tensile Stress

Xiang

Feng

et al. 2023

Applied Sciences

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The nondestructive testing technique used to evaluate the quality of bolt support by detecting the axial force is suitable for the bolt with a short construction time. For the bolt in the support state for a long time period, it may lead to the detection of small axial force only and ignore the fact that the bolt has entered the necking fracture stage, and thus fail to detect safety hazards in time. Three sets of parallel tests were conducted to solve the misjudgment of detection results due to the reduction of axial force when the bolt was in the necking fracture stage. Bolt deformation characteristics and stress wave propagation characteristics in bolts under axial tensile stress were studied by using the bolt tensile and stress wave detection test system which was modified and built independently. The results showed that (1) The diameter of the necking position decreases continuously during the tensioning process of the bolt and the rate of decrease increases abruptly during the necking fracture stage. (2) Due to the bolt stretching, the stress wave propagates in the bolt with different degrees of reflection and transmission, resulting in the attenuation of the stress wave energy; the energy attenuation ratio of the stress wave signal in the necking fracture stage reaches 35%, and the energy attenuation ratio increases exponentially as the necking continues to occur. (3) The frequency distribution of the stress wave signal during the bolt stretching process is from scattered to concentrated, the dominant frequency is gradually prominent and changes from low frequency to high frequency, the high-frequency signal is more sensitive to the cracks and necking of the bolt, and the dominant frequency is between 9500 and 10,000 Hz. (4) The average error of the stress wave method is 1.945% and the maximum and minimum values are 4.12% and 0.51%, respectively. The method is promising and provides a reference for the study of nondestructive testing of bolt stress waves in field support.

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Non-destructive test method of rock bolt based on D-S evidence and spectral kurtosis

Cited by 3 publications

References 0 publications

Investigation on the dynamic characteristics of anchor rods considering size effect and pull-out loads based on IIR-FDM

Investigation on the dynamic characteristics of anchor rods considering size effect and pull-out loads based on IIR-FDM

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

Characterization of Deformation of Bolts and Induced Stress Wave Propagation under Axial Tensile Stress

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