基于弹性波波速的降雨滑坡早期预警阈值研究

Early warning criteria against rainfall induced landslide based on elastic wave velocity

中文关键词: 滑坡  早期预警  降雨  弹性波波速  阈值

英文关键词: slope  rainfall  early warning  threshold  elastic wave velocity

中文摘要:

      降雨是诱发滑坡最主要的因素。弹性波波速监测可用于滑坡预警,为确定基于弹性波波速的降雨型滑坡预警阈值,本文开展了一系列的降雨离心模型实验。首先确定了滑坡启动前的临界变形,再统计了临界变形对应的弹性波波速,最终确定了滑坡预警波速阈值。最后,通过大型边坡模型试验和现场试验验证了弹性波速阈值的正确性。本文建议归一化的弹性波波速0.9作为降雨滑坡预警阈值,坡脚处为最佳监测位置。

英文摘要:

      Rainfall is the prime factor that induces landslides. An early warning system for rainfall-induced landslides becomes one of the best choices to reduce human casualties and economic losses caused by landslides. Elastic wave velocity monitoring can be utilized for landslide early warning. A series of rainfall centrifugal experiments were conducted to define an elastic wave velocity threshold for a rainfall-induced landslide early warning system. The critical deformation before landslide initiation is first determined. Then the elastic wave velocity corresponding to the critical deformation is compiled to establish the elastic wave velocity threshold for rainfall-induced landslides. Finally, through a large-scale slope model test and a field test, the defined threshold of elastic wave velocity is confirmed. Based on the model test results, the normalized elastic wave velocity of 0.9 is recommended as the threshold for rainfall-induced landslide warning, and the slope toe is the optimal location for wave monitoring.