Physical model experiments for shallow failure in rainfall-triggered loess slope, Northwest China.
Physical model experiments for shallow failure in rainfall-triggered loess slope, Northwest China.
复制标题
西北地区降雨引发的黄土边坡浅层破坏物理模型试验
DOI：
10.1007/s10064-018-1420-5
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发表时间：
--
影响因子：
4.2
通讯作者：
Enzhen Zhu
中科院分区：
文献类型：
--
作者：
Ping Sun;Gang Wang;Lizhou Wu;Ogbonnaya Igwe;Enzhen Zhu
为了有效地减少滑坡对人类财产和生命的影响，了解滑坡及其滑动机理具有重要意义。研究了不同降雨方式和不同边坡结构对黄土浅埋边坡变形破坏过程的影响。为实现这一目标，在室内进行了不同降雨模式下有、无垂直节理黄土边坡的3类物理模型试验。在模型边坡中埋设了体积含水量、基质吸力和孔隙水压力三种传感器，以记录驱动边坡变形的内部变化。通过对传感器记录和相应的变形变化以及不同条件下的试验结果分析，表明黄土边坡的基质吸力是逐渐减小的。黄土强度随体积含水量的不断增加而降低。黄土边坡变形和排水不良产生超孔隙水压力后，降低了有效应力，降低了黄土强度，导致滑坡的发生。此外，还观察到边坡结构对稳定性的影响大于降雨模式。本文试图解释降雨诱发黄土浅层滑坡的破坏模式和触发机制。
In order to effectively reduce the impact of rainfall-induced landslides on properties and life, it is important to understand rainfall-caused landslides and their sliding mechanisms. The objective of this paper is to study the effects of different rainfall patterns and different slope structures on the deformation and failure process of shallow loess slopes. To achieve the objective, three categories of indoor physical model experiments of a loess slope with and without a vertical joint were implemented under different rainfall patterns. Three kinds of sensors, including volumetric water content, matric suction, and pore-water pressure sensors, were buried in the model slopes to record the internal changes driving deformation. Analyses of the sensor records and the associated deformational changes, and the experimental results under different conditions show that the matric suction in loess slopes decreased gradually. Loess strength reduced with the continuous increase of volumetric water content. After excess pore-water pressure was generated by the slope deformation and poor drainage of the loess, it decreased the effective stress and the loess strength, which resulted in landslides. In addition, it was observed that the influence of slope structure on stability was greater than that of rainfall patterns. This paper attempts to explain the failure mode and triggering mechanisms of shallow loess landslides induced by rainfall.