高压物理学报2025，Vol.39Issue(5)：48-58,11.DOI:10.11858/gywlxb.20240897
冲击荷载下岩体应力波振动信号频率特征分析
Frequency Characterization of Stress Wave Vibration Signals in Rock Mass under Impact Loading
摘要
Abstract
Rock body will generate signals with different frequencies under the impact of external loads.This paper monitors the stress wave signals before and after the rock body is subjected to transient impact loads through the fiber-optic monitoring system with homemade probes,and conducts time-frequency analysis of the experimental monitoring signals using the robust local mean decomposition(RLMD)method combined with the fast Fourier transform(FFT).After that,LS-DYNA software is used to simulate the impact load applied to the rock body and generate the stress wave,and the frequency of the stress wave is verified against the frequency of the experimentally monitored stress wave.Finally,the relationship between the simulated stress wave frequency change under the change of elastic modulus and density is analyzed.Results show that the signals monitored in the field will appear as multiple signals with great amplitude after spectral decomposition of 1500-2300 Hz after the impact is applied in the field,which is consistent with the simulation result of the time-frequency analysis of the stress wave in the main frequency signal of 2203 Hz,and the opposite trend to the frequency change indicated by the one-dimensional planar stress wave derivation,which will be the next step of the research issue.关键词
时频分析/特征频率/冲击荷载/振动信号/光纤传感技术Key words
time-frequency analysis/eigenfrequency/shock loading/vibration signals/fiber-optic sensing technology分类
力学引用本文复制引用
冯佳兴,袁利伟,彭纪,陈明辉,陈迪,起卓..冲击荷载下岩体应力波振动信号频率特征分析[J].高压物理学报,2025,39(5):48-58,11.基金项目
国家自然科学基金(52364020) （52364020）
