| This thesis analyzed structural characteristics of Full-length bonded rock bar with wave motion theories in engineering and deduced stress waves propagation in Full-length bonded rock bar. Get the transmission, reflection, attenuation law of stress waves at the point of nature mutation. Deduced the attenuation law and found it is associated with space and time domain. Dissected and discussed the correlation between spatial and temporal each other. Established analysis model based on theoretical derivation and numerical simulation by ANSYS/LS-DYNA. Verify the theoretical analysis by Programmed simulation test bolt and engineering applications simultaneously With stress wave attenuation law, we studies on defect reflected waveform in Full-length bonded rock bar which is beget by construction technology and can get the position of defects in the anchor system accurately.This article main concluded are as follows:1.Establish the relationship of stress wave attenuation between time and space domains base on the propagation theory of stress wave in slender rods and the nature of the mutation bolt anchoring system point spread, reflection, attenuation law by wave motion theories in engineering;2.Establish the analysis model and modeled finite element simulation by software, simulated law of propagation, reflection, attenuation of Full-length bonded rock bar under complete state and defect state in different positions;3.Validated the Relations between the attenuation of stress wave and spatial domain by numerical simulation;4.Designed the simulation test bolt, and inverted the damping of rock bolt system;5.Proposed the analysis and analysis method of rock bolt system in defect state according to the stress wave propagation attenuation law;6.Obtained the stress wave chart of rock bolt system under dense state in nondestructive testing by means of numerical simulation software;7.Verified the feasibility of both non-destructive testing and locate hollow defect by practical projects. |
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