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采用新型介质雾化喷嘴离心场降雨模拟设备,进行了模拟降雨及格栅支护措施条件下松散堆积体边坡的离心模型对比试验。离心机模型与原型试验比尺为1:80,试验过程通过非接触定点高速摄影系统并结合粒子图像测速(particle image velocimetry)技术分析了试验过程中边坡的位移场变化。试验结果表明,松散堆积体边坡在未降雨条件下是十分稳定的;在进行模拟降雨后,边坡顶部沉降及坡面水平位移随降雨量的增大逐渐发展,尤其边坡表面区域发生明显变形;边坡的破坏模式有别于传统的圆弧滑动,在持续强降雨作用下,坡面逐层产生破坏,最终形成泥石流形态;通过采取坡面土工防护格栅支护条件后,堆积体边坡在降雨条件下稳定性显著提高,故采用边坡防护格栅是提高松散堆积体边坡稳定性的有效途径。
Centrifugal field rainfall simulation equipment with a new type of medium atomizing nozzle was used to carry out a comparative experiment on centrifugal model of loosely packed slope under simulated rainfall and grid support measures. Centrifuge model and prototype test scale 1:80, the test process by non-contact fixed-point high-speed photography system combined with particle image velocimetry (particle image velocimetry) technology analysis of the slope during the test displacement field changes. The results show that the slope of loose accumulation body is very stable under the condition of no rainfall. After the simulated rainfall, the settlement at the top of the slope and the horizontal displacement of the slope gradually develop with the increase of rainfall, especially in the surface area of the slope Deformation; slope failure mode is different from the traditional arc sliding, continuous heavy rainfall, the slope layer by layer damage, and eventually the formation of debris flow morphology; by taking the slope geogrid protection conditions, the accumulation body The stability of the slope is obviously improved under the conditions of rainfall. Therefore, using the slope protection grille is an effective way to improve the slope stability of the loose accumulation body.