地震工程学报Issue(z2)：142-146,5.DOI:10.3969/j.issn.1000-0844.2015.增刊2.0142
地震作用下三峡库区典型堆积层滑坡变形特性研究
Research on the Deformation Characteristics of Typical Accumulative Landslides in the Three Gorges Reservoir under Earthquakes
摘要
Abstract
Seismic actions in the head region of the Three Gorges Reservoir (TGR) have increased significantly since the beginning of dam impoundment .Coupled with cyclical water level fluctua‐tion ,the deformation mechanism of landslides beside TGR are worthy of research .A typical ac‐cumulative landslide located in Xingshan County was selected as a case study in this paper .Three typical adverse conditions were determined by monitoring relationship between the water level fluctuation and time of seismic occurrence .Then ,using a seismic intensity of V degree ,a multi‐field coupling numerical simulation was conducted to determine the deformation mechanism of the landslide .The results of the simulation afford the following conclusions :(1) Seismic action is closely related to water fluctuation ,while superposition of adverse flow conditions and seismic load ,the coupling effect of the seepage field and dynamic field causes a landslide deformation .(2) The structure of the debris landslide is relatively homogeneous ,except for the region close to the free face of body of debris .There are no significant undesirable geologic elements and seismic am‐plification is not reflected in the debris .Furthermore ,the mechanical parameters of debris and bedrock are quite different ,thus the boundary of debris and bedrock is also a deformation border . (3) When the seismic intensity attains the V degree ,a deformation landslide caused by continual earthquakes is limited and convergent ,but long‐term deformation monitoring for landslides is necessary .关键词
三峡库区/地震/堆积型滑坡/多场耦合数值模拟/变形特性Key words
the Three Gorges Reservoir/earthquake/accumulative landslide/multi-field coupling numerical simulation/deformation characteristics分类
天文与地球科学引用本文复制引用
江洎洧,潘家军,张伟..地震作用下三峡库区典型堆积层滑坡变形特性研究[J].地震工程学报,2015,(z2):142-146,5.基金项目
国家自然科学基金项目（51309029，51109013）；中央级公益性科研院所基本科研业务 （）
