危岩破坏激振信号频域特征研究

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (19) : 64-68.

论文

危岩破坏激振信号频域特征研究

陈洪凯1,2，唐红梅1，王智1，何晓英1

作者信息 +

Study on frequency domain characteristics of excitation signals at rupture of perilous rock

CHEN Hong-kai1, 2, TANG Hong-mei1, Wang Zhi1, HE Xiaoying1

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文章历史 +

摘要

危岩破坏激振效应是危岩聚集体连锁破坏的主要影响因素。针对坠落式危岩，进行室内模型试验，对实验结果分析表明，可以采用相干系数分析法判别危岩破坏激振信号质量的有效性，实验量测到的危岩破坏激振信号均处于a3（0～1250Hz）频率带内，采用db8（3层）小波处理方法获得了激振信号小波分解系数时程变化曲线，据此通过Fourier变换，获得其频谱图；危岩破坏激振信号总体呈现衰减趋势，但衰减过程中分别在900Hz、1100Hz和1500Hz频率处出现三个峰值；测点与激振源之间的距离越小，激振加速度越大，且竖直方向的量值均大于水平方向的量值；危岩块之间界面完整性越好，越利于激振信号的传递，竖直方向衰减率高于水平方向衰减率。研究成果对于科学揭示群发性危岩破坏机制具有积极意义。

Abstract

The excitation effect of perilous rocks is one of main impact factors to induce the chain damage of unstable aggregation rock blocks. Paying attention to the falling perilous rock, a physical model to probe the excitation effect at rupture of perilous rock is established in laboratory, and the model tests are operated. The test results show that, firstly, the effectiveness of excitation signals can be differentiated with the coherent coefficient analysis method, and almost all of the measured excitation signals at rupture of perilous rock distribute at a3 (0~1250Hz) frequency range. Secondly, the acceleration-schedule curve for each decomposition coefficient excitation signal can be gotten by db8 (3 layers）wavelet analysis method, and the spectrum figures are obtained by the Fourier transformation. Thirdly, on a macro level, the excitation signal presents an attenuation trend with three peaks at 900Hz, 1100Hz and 1500Hz, respectively. The larger the distance between the measuring point and the rupture position of perilous rock, the bigger the excitation acceleration, and the excitation acceleration at vertical direction is bigger than that at level direction. Fourthly, the favorable integrality of interface between two perilous rocks is easy to traverse for excitation signals, and numerical decrement at vertical direction is higher than that at level direction. Achievements in the paper are valuable in discoursing on the damage mechanism of massive perilous rocks.

导出引用

陈洪凯;唐红梅;王智;何晓英. 危岩破坏激振信号频域特征研究[J]. 振动与冲击, 2014, 33(19): 64-68

CHEN Hong-kai;;TANG Hong-mei;Wang Zhi;HE Xiaoying. Study on frequency domain characteristics of excitation signals at rupture of perilous rock[J]. Journal of Vibration and Shock, 2014, 33(19): 64-68