碎屑流模型试验研究

Model Studies of debris flow

碎屑流危害极大,且无法对其进行有效的预测和防范。文章通过室内模型试验,研究了不同组成的分层堆积体在不同初始启动角下,沿斜面的滑动和堆积运动,分析得到堆积体最终堆积范围的变化规律。试验结果表明:随着初始启动角的变大,堆积体由分级破坏逐渐变成整体破坏,堆积范围也会变大;堆积体上层颗粒比下层颗粒的冲程要大,对整个堆积体的冲程影响也要大;堆积体分层情况对其最终堆积范围影响较大,但随着初始启动角变大,这种影响逐渐变小。试验研究成果对研究碎屑流运动过程和堆积范围具有一定的理论参考价值。

The debris flow is a kind of geological disaster with extreme destructive power, and can not be effectively predicted and prevented. By performing laboratory model experiments, the slide and accumulation of layered particles deposit down an inclined board under different initial startiiag angle are studied. The results show that when the initial starting angle increases, the failure mode of sliding mass changes from delamination failure to integral failure, and the accumulation scope increases; the run-out of the upper particles is greater than that of the lower particles, and the upper particles exert a greater influence on the run-out of the whole sliding mass; the accumulation type has a great influence on the final accumulation scope, but when the initial starting angle increases, the influence gets weak. The experimental results can provide a theoretical reference for the study of the sliding mass movement process and accumulation scope.