邓凯丰, 程谦恭, 林棋文, 等. 2023. 碎屑流撞击地面的震动信号特征分析[J]. 工程地质学报, 31(1): 134-144. doi: 10.13544/j.cnki.jeg.2020-281.
    引用本文: 邓凯丰, 程谦恭, 林棋文, 等. 2023. 碎屑流撞击地面的震动信号特征分析[J]. 工程地质学报, 31(1): 134-144. doi: 10.13544/j.cnki.jeg.2020-281.
    Deng Kaifeng, Cheng Qiangong, Lin Qiwen, et al. 2023. Characteristic analysis of the seismic signal for granular flow impacting the ground[J]. Journal of Engineering Geology, 31(1): 134-144. doi: 10.13544/j.cnki.jeg.2020-281.
    Citation: Deng Kaifeng, Cheng Qiangong, Lin Qiwen, et al. 2023. Characteristic analysis of the seismic signal for granular flow impacting the ground[J]. Journal of Engineering Geology, 31(1): 134-144. doi: 10.13544/j.cnki.jeg.2020-281.

    碎屑流撞击地面的震动信号特征分析

    CHARACTERISTIC ANALYSIS OF THE SEISMIC SIGNAL FOR GRANULAR FLOW IMPACTING THE GROUND

    • 摘要: 崩塌、滑坡等自然灾害突发性强、时间跨度短,难以做到实时监测及快速的动力学过程分析。滑震信号监测技术较好地弥补这一缺陷。通过滑震信号的分析可快速获取崩塌、滑坡的基本特征,如规模、持续时间和动力学过程等。本文进行了碎屑流撞击地面的物理模型实验,通过分析实验过程所记录的滑震信号,研究了碎屑流初始条件、运动特征与滑震特征参数的相关关系。实验结果表明:(1)随着碎屑体体积的逐渐增大,监测信号的带宽逐渐减小;(2)随着碎屑体体积的逐渐增大,监测信号的峰值及持续时间、阿里亚斯强度和震动能量逐渐增大,相关性强;(3)碎屑体撞击的震动能与势能损失之比在3.09×10-2到7.2×10-1之间,且随着碎屑体体积的增大,震动能与势能损失之比逐渐增大。本文建立了滑震特征参数与碎屑流初始条件及运动学参数之间的关系,为山区崩滑灾害事件的监测与应急响应提供了一定的理论依据。

       

      Abstract: Owing to the unprompted and short time span of natural hazards, such as rockfalls and rockslides, it is difficult to conduct real-time monitoring and rapid event analysis. Correspondently, environmental seismology can well solve those defects. Based on the analysis of emitted seismic signal, the characteristics of rockfalls or landslides including volume, duration time and kinetics parameters can quickly be obtained. We conducted a series of laboratory experiments simulating the process of granular flow impact the ground. Then, the correlations between the seismic parameters and the initial condition and kinetic parameters of granular flow were studied via the analysis of recorded seismic signal during experiments. Experimental results showed that:(1)The bandwidth of seismic signal gradually decreases as the volume of granular flow increases; (2)The peak ground acceleration, duration time, Arias intensity and the seismic energy are gradually increasing with the increasing of granular volume, which have good correlations; (3)The ratio between the seismic energy and the potential energy lost range from 3.09×10-2 to 7.2×10-1 and mostly increases with increasing in the granular flow volume. In this paper, we established the relationship between the characteristic parameters of landquake and the initial conditions as well as kinematic parameters of granular flow, which provides a theoretical basis for the monitoring and emergency response of mountainous rockfalls and landslides.

       

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