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首页> 外文会议>IASME/WSEAS International Conference on Geology and Seismology >EVOLUTION OF DEBRIS FLOW ON HILLSIDE
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EVOLUTION OF DEBRIS FLOW ON HILLSIDE

机译：山坡上碎片流动的演变

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As one of geological disasters and geomorphological processes, debris flow stemming from loose materials on hillside will menace the safety of highways and railways in mountains. This work is to show the evolution of debris flow on hillside under action of precipitation by modeling in laboratory. One physical model is built in laboratory, in which, length and height of the model are 3.3m and 2.5m respectively, the slope angle is 35.5°, and the thickness of loose materials on the slope is 30±1 cm. Precipitation to trigger debris flow is artificial and varies with duration. The modeling identify it is reasonable to divide the evolution of debris flow into four stages with increasing and duration of precipitation, i.e., creep, sliding, flow and deposit. During stage 1 (creep), stability of the slope become weak slowly, creep is dominant and fissures on surface of the slope appear. When loose materials are in saturation, the slope becomes critical status, so stage 2 (sliding) occurs as a landslide. During stage 3 (flow), local torrents on the slope emerge and bigger ravine dominates gradually, then initial debris flow with gas and clay blocks forms, flow velocity and impact force are measured. When debris flow in ravine get to the area of the slope foot, the evolution is in stage 4 (deposit), deposit fan appears. Disasters to highways and/or railways usually produce at the area of the slope foot during stage 3 and stage 4.
机译：由于地质灾害和地貌过程中的一个，从山坡松散物料所产生的泥石流将威胁着山区的高速公路和铁路的安全。这项工作是在实验室模拟显示对降水的作用下山坡泥石流的演变。一个物理模型的建立实验室，其中，长度和高度模型的分别3.3米和2.5米，倾斜角为35.5°，并在斜坡上松散材料的厚度为30±1厘米。沉淀触发泥石流是人为的，具有持续时间的不同而不同。建模识别它是合理的泥石流的进化分成四个阶段随和沉淀的持续时间，即，蠕变，滑动，流动和存款。在阶段1（蠕变），斜率的稳定性变弱缓慢，蠕变是显性和斜坡上的表面裂缝出现。当松散材料在饱和度，斜率变得临界状态，所以第2阶段（滑动）时，为滑坡。在阶段3（流动），在斜坡上本地种子出现和更大的深谷逐渐占主导地位，然后用气体和粘土块的形式初始碎屑流量，流速和冲击力进行测量流动。当碎屑在深谷获取流到坡脚的区域中，该进化是在阶段4（存款），存款风扇出现。灾害高速公路和/或铁路通常阶段3和阶段4期间产生在斜坡脚的区域。

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