水石流冲击信号频谱及其能量分布特征试验研究  

Experimental Study on Impact Characteristics of Water-stone Flow Considering Particle Grading Conditions

作　　者：陈洪凯[1,2] 廖学海 张金浩 CHEN Hongkai;LIAO Xuehai;ZHANG Jinhao(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of City and Architecture Engineering,Zaozhuang University,Zaozhuang 277160,China;College of Architecture and Civil Engineering,Xinyang Normal University,Xinyang 464000,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]枣庄学院城市与建筑工程学院,山东枣庄277160 [3]信阳师范学院建筑与土木工程学院,河南信阳464000

出　　处：《信阳师范学院学报（自然科学版）》2022年第4期664-670,共7页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家重点研发计划(2018YFC1505405)。

摘　　要：综合考虑5组颗粒级配碎石(A—E)和6级固液比(0.01、0.05、0.10、0.15、0.20、0.25)的组合工况,采用室内大型模型试验,研究了水石流对防护结构的冲击振动特性,并采用小波理论分析提取了冲击振动加速度信号的频谱和能量谱。试验结果表明:冲击信号的自相关曲线在τ=0时出现峰值,两侧出现非周期性波动,信号的周期性差,但同一信号中的两段脉冲信号具有高度相关性,信号的稳定性好;冲击信号能量最大值位于低频近似系数a_(8)频段,各频段的最大幅值均由低频(a_(8):0~0.3905 Hz)向高频(d_(5):3.125~6.250 Hz)衰减,衰减幅度逐渐降低;水石流有效冲击加速度信号位于0~6.250 Hz范围,其余中高频段主要为噪声信号。研究结果可为研究水石流的冲击特性提供一种新的测试方法,为水石流灾害防治结构设计提供参考。The model of water-stone flow impact test is established in laboratory to explore the impact characteristics of water-stone flow, with considering 6-stage solid-liquid ratios(0.01, 0.05, 0.10, 0.15, 0.20, 0.25) and 5 particle grading conditions(A—E). The spectrum and energy spectrum of impact acceleration signal are extracted based on the wavelet analysis method. The results show that, when τ=0, the auto correlation curve of the impact signal has a maximum value, but the curves on both sides are not periodic, indicating that the periodicity of the signal is poor. The two impulse signals are stable and highly correlated. The maximum energy of shock signal is in aband.The maximum amplitude of each frequency band gradually decays from low frequency(a_(8): 0~0.390 5 Hz) to high frequency(d_(5): 3.125~6.250 Hz).The real impact acceleration signal of water-stone flow is in the band of 0~6.250 Hz, and the rest are noise signals. The research provides a new method for studying the impact characteristics of water-stone flow, and some references for the design of water rock flow disaster prevention structure.

关 键 词：泥沙动力学 水石流 模型试验 冲击特性 能量分布 

分 类 号：P642.23[天文地球—工程地质学]