水石流冲击信号能量分布试验研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (14) : 56-59.

论文

水石流冲击信号能量分布试验研究

陈洪凯1,2 鲜学福2 唐红梅1,2 张玉萍1 何晓英1 文光菊1 唐兰1

作者信息 +

Study on energy distribution of shock signal in laborotary for non-viscosity debris flow

CHEN Hong-kai1,2 XIAN Xue-fu2 TANG Hong-mei1,2 ZHANG Yu-ping1
HE Xiao-ying1 WENG Guang-ju1 TANG Lan1

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摘要

摘要：泥石流冲击谱是泥石流固液两相介质运动特性的综合表征，探索泥石流冲击信号的能量大小及其分布特性是合理确定泥石流冲击荷载的关键环节。运用自行研制的试验模型，实施了15种试验工况的泥石流冲击试验，获取了85000多个测试数据。依据固相比为0.16、粒径组为0.8~1.5cm水石流冲击测试结果，运用db8小波基变换对试验结果进行8层小波分解，得到频率范围分别为0~0.195Hz、0.195~0.391Hz、0.391~0.781Hz、0.781~1.5625Hz、1.563~3.125Hz、3.125~6.25 Hz、6.25~12.5 Hz、12.5~25 Hz和25~50Hz共九个频率段的冲击信号，据此揭示了不同频段冲击信号能量分布规律。从低频段至中高频段水石流冲击能量非线性衰减，90%以上的冲击能量分布在小于0.195Hz的低频部分；水石流在中高频段的冲击能量总体呈衰减分布，但在频段三和频段六出现较显著峰值，表明水石流也存在一定阵流现象；水石流中固相粒径越小，低频段至高频段的冲击能量衰减速度越慢。研究成果可为进一步实施泥石流冲击荷载精细实验研究提供一定科学依据。

Abstract

Abstract：Shock spectrum of debris flow is the comprehensive characterization to its kinetic characteristics as it is a solid-liquid two-phase media. To explore the magnitude and distribution of debris flow impact energy is the key to confirm the impact load. Impact tests of debris flow were taken under 15 test conditions, which could obtain more than 85000 test data using self-developed test model. Impact signals in nine frequency channels whose frequency section are 0~0.195Hz,0.195~0.391Hz,0.391~0.781Hz,0.781~1.5625Hz,1.563~3.125Hz,3.125~6.25 Hz,6.25~12.5 Hz,12.5~25 Hz and 25~50Hz are obtained during the impact test of water-rock debris flow with 0.16 in solid phase ratio and 0.8 -1.5cm in diameter of solid particle. The regularities of energy distribution in different frequency section can be revealed by the db8 wavelet transform. The regularities could be summarized to four points. Firstly, the impact energy of water-rock debris flow is nonlinear attenuation from low frequency to high frequency. Secondly, more than 90% of the impact energy are distributing at the low frequency section which is lower than 0.195Hz.Thirdly, in high frequency, the distribution of impact energy totally decayed, while, dramatic peak value exists in the third frequency channel three and sixth frequency which means that blast flow exists in water-rock debris flow. Fourthly, in low frequency channel, the lower the attenuating rate of impact energy is, the smaller the grain size of solid phase in water-rock debris flow is. The results could provide some scientific basis for further study on impact load of debris flow.

导出引用

陈洪凯;鲜学福唐红梅;张玉萍何晓英文光菊唐兰. 水石流冲击信号能量分布试验研究[J]. 振动与冲击, 2012, 31(14): 56-59

CHEN Hong-kai;XIAN Xue-fu TANG Hong-mei;ZHANG Yu-pingHE Xiao-ying WENG Guang-ju TANG Lan. Study on energy distribution of shock signal in laborotary for non-viscosity debris flow[J]. Journal of Vibration and Shock, 2012, 31(14): 56-59