【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。更多还原

【Abstract】 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 impounding of downstream dam site of Lenggu hydropower project and earthquake condition.That can lead to high-speed landslide of the whole slope.更多还原