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<p>A large-scale indoor impact experiment of multiple working conditions and theoretical analysis were carried out, aiming to study the stability of abamurus subgrade under the impact and vibration of flood and debris flow. Experimental results show that the peak impact of flash floods is significant, whereas the pulsating flow characteristics are weak. A relationship between the peak flash flood impact force and its density and peak vibration acceleration was established as F = 0.28 ma + 10.05. Based on the impact vibration characteristics of flash flood-induced debris flows, the failure mechanism and stability of riverside highway retaining walls were analyzed. Formulas for calculating roadbed scour depth and retaining wall stability under impact vibration were derived. Taking a riverside roadbed retaining wall in Kaizhou as an example, the calculated scour depth is 2.137&#xa0;m. Under the impact and vibration of flash flood scouring and flood flow, the sliding stability coefficient decreases from 1.330 to 0.956, and the overturning stability coefficient drops from 1.957 to 1.087. The calculated results are in good agreement with actual conditions. The research results have a positive effect on the understanding of the damage mechanism of abamurus subgrade and disaster prevention and mitigation under the impact of flood and debris flow.</p>

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Stability Assessment of Subgrade Abamurus Under Flood and Debris-Flow-Induced Impact and Vibration

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Zhang Jinhao,
  • Liao Xuehai,
  • Chen Hongkai

摘要

A large-scale indoor impact experiment of multiple working conditions and theoretical analysis were carried out, aiming to study the stability of abamurus subgrade under the impact and vibration of flood and debris flow. Experimental results show that the peak impact of flash floods is significant, whereas the pulsating flow characteristics are weak. A relationship between the peak flash flood impact force and its density and peak vibration acceleration was established as F = 0.28 ma + 10.05. Based on the impact vibration characteristics of flash flood-induced debris flows, the failure mechanism and stability of riverside highway retaining walls were analyzed. Formulas for calculating roadbed scour depth and retaining wall stability under impact vibration were derived. Taking a riverside roadbed retaining wall in Kaizhou as an example, the calculated scour depth is 2.137 m. Under the impact and vibration of flash flood scouring and flood flow, the sliding stability coefficient decreases from 1.330 to 0.956, and the overturning stability coefficient drops from 1.957 to 1.087. The calculated results are in good agreement with actual conditions. The research results have a positive effect on the understanding of the damage mechanism of abamurus subgrade and disaster prevention and mitigation under the impact of flood and debris flow.