湖北清江鱼洞河滑坡变形机制及稳定性研究

Study on deformation mechanism and stability of Yudonghe landslide

鱼洞河滑坡受上硬下软的不利地质结构、缓倾坡外的斜顺向坡、构造裂隙的发育以及地下水对滑带的浸泡软化等因素的影响 ,曾经发生过三个不同序次的规模滑动 ,在距今 5 0～ 6 0万年曾经发生过一次剧烈滑动 ,主要以粘滑运动方式为主 ,目前 ,滑坡正处于活动不稳定状态和宏观扩展变形阶段。滑坡稳定性系数计算表明 ,鱼洞河滑坡整体上对水布垭大坝的建设不构成很大的危害 ,但是必须对东边湾滑坡的涌浪引起足够的重视 。

Yudonghe landslide is resulted from the disadvantageous geological structure,down dip slope,and development of structural fissures,soaking and softening of groundwater in the sliding zone.It has undergone sliding 3 times over the geological historical period.The most severe one took place 500,000-600,000 years ago.Presently,the landslide is in the stage of relatively instable and macroscopic expanding.The calculated stability coefficients of the landslide demonstrate that Yudonghe landslide does not endanger the construction of Shuibuya dam badly.However,attention should be given to the surging of Dongbianwan landslide,and corresponding countermeasures should be taken.