植草对降雨引起的松软填土缓坡失稳的影响

Pei Tai , Fan Wu , Bohan Bai , Zhaofeng Li , Rui Chen , Lulu Zhang
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引用次数: 0

摘要

与陡峭的斜坡相比,人们对降雨引起的松散填土缓坡滑坡的了解十分有限。因此,我们在连续降雨条件下对淤泥质沙质斜坡进行了两次物理模型试验:一次是在光秃秃的斜坡上,另一次是在种植了黑麦草的斜坡上。25° 的斜坡角远小于斜坡材料的内摩擦角(34.3°),因此模型试验完全属于缓坡范畴。对于最初未饱和的裸露斜坡来说,18 年一遇的降雨会引发快速的整体倒退滑动,这与以往认为缓坡只会发生浅层破坏的结论不同。同时观测到孔隙水压力突然增大,这可能是由于非饱和松散土壤受湿润诱发崩塌所致。另一方面,植草斜坡的稳定性明显增强,能够经受比重现期为 100 年的降雨事件更严重的降雨,而且变形很小。结果表明,黑麦草根系增加的抗剪强度超过了因蓄水能力增强而增加的滑动力。此外,研究还发现,在用草加固的斜坡上,孔隙压力的突然变化不再是斜坡崩塌的征兆。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of grass plantation on the rainfall-induced instability of gentle loose fill slope

The understanding of rainfall-induced landslides on gentle, loose-fill slopes is limited in comparison to steep slopes. Hence, two physical model tests were conducted on silty sand slopes under continuous rainfall: one on a bare slope and the other on a slope planted with ryegrass. The slope angle of 25° is much lower than the internal friction angle of slope material (34.3°), which makes the model test fall well into the category of gentle slope. For the initially unsaturated bare slope, a rainfall event with return period of 18 years could trigger a rapid and retrogressive global sliding, which differs from previous findings that gentle slopes would only experience shallow failure. A sudden increase in pore-water pressure was simultaneously observed, which might be generated by the wetting-induced collapse of unsaturated loose soil. On the other hand, the stability of the slope with grass plantation was significantly enhanced, and it was able to withstand rainfall event more severe than those with a return period of 100 years, with only minimal deformation. The results suggest that the gain in shear strength due to ryegrass roots surpasses the additional sliding force caused by the increased water retention capability. Additionally, it is found that the abrupt change in pore pressure was no longer indicative of slope failure in the case of the grass-reinforced slope.

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