长江科学院院报Issue(3)：115-121,7.DOI:10.11988/ckyyb.20140802
地震作用下顺层岩质滑坡稳定性离散元模拟
Discrete Element Simulation of Stability of Bedding Rocky Landslide Under Earthquake Action
冉涛 1赵安平 1尹剑辉1
作者信息
- 1. 中国科学院 地质与地球物理研究所，北京 100029
- 折叠
摘要
Abstract
In this research, we simulate the dynamic response characters and failure mechanism of landslide by u⁃sing the universal distinct element code( UDEC) . Enziping landslide No. 2 in the Xiluodu reservoir area of Jinsha river is taken as example, and Ninghe⁃Tianjin earthquake record as the dynamic parameter. Simulated results show that:1) under earthquake action, slope shows obvious amplification effect, and amplification effect of acceleration is the biggest, followed by displacement, velocity;2) area of shear stress concentration and the shear strain of the slip zone dramatically increase after the peak value of the seismic wave, and the deformation and failure extended from the front to the rear of the slip zone due to the accumulation effect of shear strain;3) safety factor of landslide stability is less than 1.0 and the maximum accumulated displacement is up to 1.58 m when the earthquake stops. Through analyzing calculated data, we conclude that failure mechanism of the landslide results from the combination effect of motion amplification and shear stress concentration and the accumulation of shear strain, and the failure mode remains bedding slide. In light of failure state of the landslide, we give suitable anchoring treatment sugges⁃tions for reducing the risk of river closure by earthquake⁃induced landslide so as to ensure the operation of Xiluodu hydropower project.关键词
顺层滑坡/地震/动力响应/变形破坏机制/离散元法Key words
bedding landslide/earthquake/dynamic response/deformation and failure mechanism/discrete ele-ment method分类
天文与地球科学引用本文复制引用
冉涛,赵安平,尹剑辉..地震作用下顺层岩质滑坡稳定性离散元模拟[J].长江科学院院报,2016,(3):115-121,7.
