危岩破坏激振信号局部和细节信息特征

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (24) : 15-18.

论文

危岩破坏激振信号局部和细节信息特征

陈洪凯1,2 杨铭1，唐红梅2 何晓英2 王智2

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Study on local and minutiae characteristics of excitation signals at perilous rock rupture

CHEN Hong-kai1, 2, YANG Ming1, TANG Hong-mei2, HE Xiao-ying2, WANG Zhi2

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文章历史 +

摘要

危岩属于一种突发性地质灾害，危岩破坏会突然释放能量，以激振波的形式向邻近危岩块传递，劣化相邻危岩体的稳定性。通过坠落式危岩破坏激振效应模型试验，对采集的激振信号进行小波滤噪处理，选取模型试验第25～35ms共10ms时间段的激振信号，作为分析激振信号局部和细节信息特征的基础数据。分析结果表明，实验条件下分析时段内，危岩破坏激振信号局部信息存在周期性，激振信号在水平方向存在8～9个激振峰，周期1.0～1.4ms，在竖直方向存在3～4个激振峰，周期2.2～3.0ms；测点与激振源之间的距离影响着激振信号的峰值强度，距离越近，峰值强度越大；危岩块之间界面的完整性对激振信号出现频率和峰值强度都有显著影响，激振信号穿过不完整的界面后激振信号主峰存在一定滞后性，实验条件下滞后时间10ms左右；危岩破坏激振信号的局部和细节信息基本都在细节系数中予以体现，尤其是主频率主要位于d3～d7所对应的中频细节信息内。研究成果对于进一步实施危岩破坏激振效应的相似模型试验具有积极意义。

Abstract

As one of emergency geological disasters, perilous rock will release abruptly energy at rupture. The energy pass into perilous rock blocks near the rupture position in excitation wave, and decreases stability of perilous rocks near the rupture position. By the de-noising processing in wavelet methods to excitation signals gathered in model test of falling perilous rock rupture in laboratory, this paper takes the signals during 10 ms duration from the 25 ms to 35 ms in model test as the essential data to analyze local and minutiae characteristics of excitation signals at perilous rock rupture. Under the experimental conditions, analysis results show that, local characteristics of excitation signals at perilous rock rupture has certain periodicity, i.e., 8 or 9 excitation peaks with 1.0~1.4 ms periodicity in horizontal direction, while 3 or 4 excitation peaks with 2.2~3.0 ms periodicity in vertical direction. The distance between measuring point and the rupture position significantly impacts the amplitude of excitation peaks, the closer the distance, the bigger the amplitude. Furthermore, the integrity of interface between two perilous rock blocks has a significant impact on frequency and amplitude of excitation peaks, for example, when the excitation signal pass into incomplete interface the peaks of excitation signal are lagged a little, about 10ms under the experiment. Specially, almost all local and minutiae characteristics of excitation signals at perilous rock rupture can be embodied by minutiae coefficient, and the main frequency of excitation signals appear in minutiae characteristics from d3 to d7. Achievements in the paper are valuable in implementation of similar model test of excitation effect at perilous rock rupture.

导出引用

陈洪凯;杨铭;唐红梅何晓英王智. 危岩破坏激振信号局部和细节信息特征[J]. 振动与冲击, 2014, 33(24): 15-18

CHEN Hong-kai;;YANG Ming;TANG Hong-mei;HE Xiao-ying;WANG Zhi. Study on local and minutiae characteristics of excitation signals at perilous rock rupture[J]. Journal of Vibration and Shock, 2014, 33(24): 15-18