Failure processes in a full-scale landslide experiment using a rainfall simulator
Failure processes in a full-scale landslide experiment using a rainfall simulator
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DOI：
10.1007/s10346-004-0034-0
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发表时间：
2004-12-01
期刊：
影响因子：
6.7
通讯作者：
Wang, G.
中科院分区：
文献类型：
--
作者：
Moriwaki, H.;Inokuchi, T.;Wang, G.
为研究降雨诱发滑坡的破坏过程，在松散桑迪土中进行了滑坡体模型试验。试验采用23米长、约8米高的水槽，由三部分组成：上部30度斜坡段、下部10度斜坡段和斜坡底部的水平段。水槽以100 mm/h的恒定强度喷洒。洒水开始后约154 min，上部边坡首先发生滑坡，41 min内发生蠕动运动，滑体在约5 s内滑动停止，压缩下部缓坡和水平段的土壤。对滑坡运动的动力学过程和破坏过程中地下水压力的变化进行了测量和分析。连续的视觉观察提供了一个清晰的记录滑动面在失败。在边坡和水平土层中的地下水压力的快速增加也记录在故障期间。据推测，增加的水压力在上部的斜坡是由于松散的土壤结构在剪切过程中的平移滑动的崩溃，而那些在斜坡的下部和水平部分是由于混合的土壤压缩和剪切的滑动体。
A full-scale landslide experiment was conducted to clarify the failure process of a landslide triggered by rainfall, using a loose sandy soil. The experiment used a 23-m long and about 8-m high flume, consisting of three parts: an upper 30 degrees slope section, a lower 10 degrees slope section, and a horizontal section at the foot of the slope. The flume was sprinkled at a constant intensity of 100 mm/h. The landslide occurred first in the upper slope about 154 min after the sprinkling started, following a creep movement within 41 min. The sliding mass slid to a stop in about 5 s, compressing soils in the lower gentle slope and horizontal sections. The dynamic process related to slide movement and the fluctuation of subsurface water pressures during failure were measured and analyzed. Sequential visual observations provided a clear record of the slip surface during failure. The rapid increase of subsurface water pressure in the slope and horizontal soil layers was also recorded during failure. It was inferred that the increased water pressures in the upper slope resulted from collapse of loose soil structure during shearing in the translational slide, whereas those in the lower portion of the slope and horizontal sections resulted from a mix of soil compression and shearing by the sliding mass.