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首页> 外文期刊>Geosciences >Bench-Scale Experiments on Effects of Pipe Flow and Entrapped Air in Soil Layer on Hillslope Landslides
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Bench-Scale Experiments on Effects of Pipe Flow and Entrapped Air in Soil Layer on Hillslope Landslides

机译：坡面滑坡对土壤层中管道流量和夹带空气影响的实验研究

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Soil pipes are commonly found in landslide scarps, and it has been suggested that build-up of pore water pressure due to clogged soil pipes influences landslide initiation. Several researchers have also suggested that entrapped air in the soil layer increases the pore water pressure. We carried out bench-scale model experiments to investigate the influence of soil pipes and entrapped air on the build-up of pore water pressure. We installed a water supply system consisting of an artificial rainfall simulator, and used a water supply tank to supply water to the model slope and artificial pipe. We used two types of artificial pipe: A straight pipe, and a confluence of three pipes. Furthermore, we placed a layer of silica sand on top of the model slope to investigate the effect of entrapped air in the soil layer on the build-up of pore water pressure. Silica sand is finer than the sand that we used for the bulk of the model slope. Our results indicate that, although artificial pipes decrease the pore water pressure when the amount of water supplied was smaller than the pipe drainage capacity, the pore water pressure increased when the water supply was too large for the artificial pipe to drain. In particular, the confluence of pipes increased the pore water pressure because the water supply exceeded the drainage capacity. The results also indicate that entrapped air increases the pore water pressure in the area with relatively low drainage capacity, too. Based on these results, we found that although soil pipes can drain a certain amount of water from a soil layer, they can also increase the pore water pressure, and destabilize slopes. Furthermore, entrapped air enhances the trend that the pore water pressure can increase in the area with relatively low drainage capacity, as pore water pressure increases when too much water is supplied, and the artificial pipe cannot drain all of it.
机译：土壤管道通常出现在滑坡陡坡中，并且有人提出，由于土壤管道堵塞而导致的孔隙水压力的增加会影响滑坡的形成。一些研究人员还提出，土壤层中夹带的空气会增加孔隙水压力。我们进行了台式模型实验，以研究土壤管和截留的空气对孔隙水压力建立的影响。我们安装了一个由人工降雨模拟器组成的供水系统，并使用了一个供水罐向模型坡度和人工管道供水。我们使用了两种类型的人造管：直管和三管汇合。此外，我们在模型斜坡的顶部放置了一层硅砂，以研究土壤中截留的空气对孔隙水压力建立的影响。硅砂比用于模型坡度的大部分的砂细。我们的结果表明，尽管当供水量小于管道排水能力时，人造管会降低孔隙水压力，但当供水量太大而无法排水时，孔隙水压力会增加。特别是，管道的汇合增加了孔隙水压力，因为供水超过了排水能力。结果还表明，在排水能力相对较低的地区，夹带的空气也会增加孔隙水压力。根据这些结果，我们发现尽管土壤管可以从土壤层中排出一定量的水，但它们也可以增加孔隙水压力并破坏斜坡的稳定性。此外，截留的空气增加了在排水能力相对较低的区域中孔隙水压力会增加的趋势，因为当供水过多时孔隙水压力会增加，而人造管无法将其全部排出。

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