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为研究降雨引起的粘性土边坡变形破坏,进行了边坡的降雨离心模型试验。试验中利用自主研制的离心场降雨模拟设备,用图像采集和相关分析方法,观测了降雨过程中土坡的破坏形态和位移场变化过程。结果表明:降雨对边坡稳定性产生很大影响。降雨引起均质土坡发生浅层土体滑移破坏,雨水入渗至土坡较深的位置。降雨引起土坡位移逐渐增大,且变形区域也逐渐扩展,最终形成明显的位移集中区域。土坡中一点位移发展可分为小位移阶段、迅速增大阶段和缓慢增大阶段。
In order to study the deformation and failure of the clay slope caused by rainfall, a rainfall centrifuge model test was carried out. In the experiment, the self-developed centrifugal field rainfall simulation equipment was used to observe the failure state and displacement field change process of soil slope during rainfall with the method of image acquisition and correlation analysis. The results show that rainfall has a great influence on slope stability. Rainfall causes the slip and failure of shallow soils in homogeneous soil slopes, and the infiltration of rainwater into deeper soil slopes. Due to rainfall, the displacement of soil slope gradually increases, and the deformed area also gradually expands, eventually forming a significant displacement concentrated area. A little displacement development in the soil slope can be divided into small displacement phase, rapid increase phase and slowly increase phase.