1.Department of Geological & Geotechnical Engineering, Chongqing Jiaotong University, Chongqing 400074 China2.Key Laboratory For the Exploitation of Southwestern Resources & the Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, Chongqing 400044 China
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.
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]. , 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. , 2012, 31(14): 56-59.
2012, Vol. 31 
