Non-destructive testing method of anchor rod axial force based on vibration response characteristics of anchor rod components

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (13) : 119-126.

WANG Yusai1, ZHANG Kai2, XIAO Fangyuan1, CAO Heng1, ZHANG Mengyu1

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Abstract

Measuring the anchor rod's axial force helps determine surrounding rock stability. The relationship model between bolt vibration frequency and axial force was constructed based on contact mechanics theory, and a vibration test of the anchor anchoring system was conducted. By collecting vibration signals from nuts and pallets, bolts and pallets' nonlinear vibration properties under various force conditions were analyzed, and a relationship between their vibration frequencies and axial forces was obtained; a real-time nondestructive testing (NDT) method for axial force was proposed based on the bolts and pallet's nonlinear vibration. The test results show that nut and pallet vibration frequency increases non-linearly with increasing anchor axial force, nut's frequency is not lower than pallet's, and pallet's growth rate is higher than nut; the growth of both vibration frequency and axial force is a single-value mapping connection, and nut and pallet vibration can be used to detect anchor axial force non-destructively.

Key words

Nonlinear vibration / frequency / anchor components;nondestructive testing of axial forces

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WANG Yusai1, ZHANG Kai2, XIAO Fangyuan1, CAO Heng1, ZHANG Mengyu1. Non-destructive testing method of anchor rod axial force based on vibration response characteristics of anchor rod components[J]. Journal of Vibration and Shock, 2023, 42(13): 119-126

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