摘要
为了探究大型岩质滑坡在运动过程中的各项特性,提出采用Hertz-Mindlin黏结接触模型模拟岩石颗粒间的相互作用,并将其用于预测某大型岩质滑坡的滑动过程,结果表明:根据滑坡运动速度分布规律,可将岩质滑坡运动过程划分为坡体失稳、加速滑动和减速堆积3个阶段;在边坡失稳阶段,滑坡体整体运动速度小,局部岩体发生坍塌掉落,这是发生大规模滑坡的前兆,应引起重视;滑坡体前部和中部运动速度大,最终堆积到河谷内,而后部坡体滑动受阻,大部分岩体堆积在上部峡谷内部,是发生二次滑坡和泥石流的物源;随着滑坡的运动,岩体结构破坏逐渐增加,岩体贯穿性裂缝出现在失稳阶段。根据滑坡的堆积特征,发现小岩块位于上游,大岩块位于下游,滑坡体往下游运动的距离更远,说明滑坡对下游影响更大。根据以上计算成果,认为将Hertz-Mindlin黏结接触模型用于岩质滑坡的模拟预测是合理的。
In order to explore the characteristics of large - scale rock landslides in the process of movement, the Hertz - Mindlin bond contact model was used to simulate the interaction between rock particles, and this paper also used to predict a potentiallarge rock land- slide. The results showed that： According to the landslide motion velocity distribution, the rock landslide sliding process was divided in- to 3 stages, including slope instability, accelerating sliding and decelerating accumulation; in the stage of slope instability, the velocity of landslide was low, and local rock collapse would occur, which was a harbinger for large - scale landslide. It should be paid attention toall of us; the velocity in the front and middle of landslide was large, and the sediments would deposit at the toe of slope. However, due to resistance in the rear landslide, the most sediments were in the upper canyon , which would occur landslide and debris flow a- gain; with the movement of landslide sliding, the structural failure of rock mass increased gradually, and the progressive failure of rock mass was unstable. According to the depositing characteristics, it was obvious to found that small rock blockswere located in the upper reaches, and the larger one would be located in the lower reaches. The farther distance of the landslide mass, the more impact on the lower reaches. Based on above results, it concluded that the Hertz - Mindlin bond contact model was reasonable for simulation and pre- diction of rock landslide.
出处
《人民珠江》
2017年第9期69-77,共9页
Pearl River
基金
西华大学研究生创新基金项目(ycjj2015162)
