唐古栋滑坡变形破坏机制及岸坡稳定性研究  

Deformation Mechanism and Engineering Influence on the Stability of Tanggudong Landslide

作　　者：肖华波[1] 王刚[1] 郑汉淮[1] 夏万洪[1] 

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,成都610072

出　　处：《长江科学院院报》2014年第11期76-80,共5页Journal of Changjiang River Scientific Research Institute

摘　　要：结合坡体结构分析及有限差分计算,研究了唐古栋滑坡在历史上河谷下切过程中边坡应力、应变发展规律,得出了前缘缓倾坡外结构面发育类高边坡变形破坏机制可归纳为"卸荷拉裂—滑移(压致)拉裂—剪断"3段式机制的结论。基于变形破坏机制研究及数值模拟计算,分析出唐古栋滑坡上游侧变形体在楞古水电站下坝段蓄水、地震工况共同作用下,锁固段岩体内应力集中明显、塑性破坏严重,可能导致边坡整体高速失稳。According to slope structure analysis and simulation using finite difference method,changes of stress and strain in the Tanggudong slope during the down-cutting of Yalong River valley in the history were studied.The deformation mechanism of slope with structural planes dipping outside in the slope foreside can be summarized into three stages （unloading tension crack,sliding tension pressed crack,and tension pressed-shearing）.According to the mechanism analysis and simulation,the locked section of rock mass in the upstream residual deformation slope will show strong stress concentration and severe plastic failure under the impoanding of downstream dam site of Lenggu hydropower project and earthquake condition.That can lead to high-speed landslide of the whole slope.

关 键 词：楞古水电站 唐古栋滑坡 坡体结构 变形破坏机制 缓倾坡外结构面 锁固段 

分 类 号：TV221.2[水利工程—水工结构工程] P642.22[天文地球—工程地质学]