基于地震信号的滚石定位及动力参数反演研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (17) : 19-26.

论文

基于地震信号的滚石定位及动力参数反演研究

王东坡，陈会娟，李伟，闫帅星，陈政

作者信息 +

Rolling stone positioning and dynamic parametric inversion based on seismic signals

WANG Dongpo, CHEN Huijuan, LI Wei, YAN Shuaixing, CHEN Zheng

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文章历史 +

摘要

基于滚石诱发地震信号可快速准确地获取滚石灾害信息，对灾情评估至关重要。本文开展了滚石冲击坡面地震动监测现场原位试验，揭示了滚石冲击地震信号时频域特征规律，分析了到时法与极化法的震源定位性能，并基于量纲分析法建立了滚石体积与冲击速度反演模型。结果表明：滚石冲击坡面（弹跳阶段）产生的地震信号表现为短持时、宽频带的三角状脉冲特征；结合到时法和极化法震源定位理论，实现了滚石冲击坡面的空间定位，得出到时法是更为优良的滚石冲击震源定位方法，其平均相对定位误差不超过10%；基于无量纲反演模型预测的滚石体积、冲击速度与实际结果吻合较好，平均预测误差均低于20%。研究成果可为滚石灾害动力学参数的快速获取提供理论与技术支持。

Abstract

Rockfall Information can be obtained quickly and accurately utilizing its generated seismic signals, which is important for hazard assessment. In-situ tests were conducted with rockfalls impacting on the slope, revealing the time-frequency domain characteristics of the generated signals. The rockfall locations determined by the arrival-time-based method and polarization analysis were compared. Empirical models for estimating the rockfall volume and impact velocity with seismic signals were developed using the dimensional analysis method. The results showed that seismic signals generated by a rockfall impact during the bouncing phase are characterized by a short duration and broad-band "triangular" pulse, which can be helpful in identifying rockfall hazards. The spatial location of the rockfall was calculated, combining the source localization theory using the arrival-time-based and the polarization analysis methods. We found that the arrival-time-based method performs better than the latter method in terms of localization accuracy, and its average relative error does not exceed 10%. The volume and impact velocity of rockfall predicted by the established dimensionless inversion model are basically consistent with the actual results, with an average prediction error of less than 20%. The results of present study may provide theoretical and technical support for emergency rescue of rockfall hazards using seismic signals.

导出引用

王东坡, 陈会娟, 李伟, 闫帅星, 陈政. 基于地震信号的滚石定位及动力参数反演研究[J]. 振动与冲击, 2024, 43(17): 19-26

WANG Dongpo, CHEN Huijuan, LI Wei, YAN Shuaixing, CHEN Zheng. Rolling stone positioning and dynamic parametric inversion based on seismic signals[J]. Journal of Vibration and Shock, 2024, 43(17): 19-26

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