科研之友
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摘要
Comb tooth dam and other structures can be simplified as cantilever beams when impacted by debris flow rocks. The statics theory based on deformation of cantilever beam is one of main methods to solve impact force of rock impacting cantilever beam, but it can' t reflect dynamic scene of debris flow rock impacting structure. Here, aiming at dynamic characteristics of rock impacting cantilever beam, based on fiber Bragg grating sensing technology, falling hammer was imitated as rock in debris flow，7 groups of falling hammer impact tests were conducted under different working conditions, and impact force time histories of falling hammer were inversed with Green' s function. The results showed that Green' s function can effectively inverse impact force time histories of rock impacting cantilever beam; the accuracy of inversion results of impact force is subject to sampling frequency of demodulator ; the error of test calibration is 15. 3% ; the calculation results of the statics method is 3 - 5 times higher than those here; thus, this study solves the scientific problem of how to describe dynamic characteristics of debris flow rocks impacting cantilever beam, and meanwhile, the inversion results are further improved ; the study results can effectively provide a theoretical basis for design of debris flow prevention projects.
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