Signal Feature Analysis of Excited Stress Waves in Bolts Embed in Different Anchor Medium

Abstract:

Based on the one-dimensional wave theory, nondestructive testing with stress wave reflection method bolts is a kind of quick and effective detection method; the method was used to estimates the anchorage quality according to some parameters such as waveform, phase, amplitude, frequency as well as arrival time of both the incident wave and the reflected wave; stress wave velocity is the basic parameter for quality assessment, the velocity is depended on signal identification of the integrity bolts, especially the reflected ones from the bottom. This paper, through the transient dynamic response experiment of anchor in different anchor medium, analyzes the dynamic measurement signal waveform characteristics. The results show that, fixed end reflection signal is very strong , but bottom end reflection signal is very weak, even it is difficult to identify; the compactness of surrounding rock and anchorage medium have certain effect in dynamic measuring signal waveform characteristics, if surrounding rock and anchorage medium is uniform and dense, the wave type of anchor dynamic measuring signal is regular and steady, instead, signal clutter and irregular; model size and boundary conditions also have certain effect on the change characteristics of the signal, so this effect should be considered in laboratory experiment.

• Periodical: Advanced Materials Research (Volumes 671-674)
• Pages: 393-396
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.671-674.393
• Online since: March 2013
• Authors: Bing Sun, Xu Tao Zheng, Sheng Zeng
• Keywords: Anchorage Quality, Bottom Reflection, Dynamic Measuring Signal, Geotechnical Engineering, Stress Wave Reflection Method

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