金沙江上游某库区滑坡稳定性分析及滑速涌浪预测  

Landslide stability analysis and slide velocity and surge wave predictions of a reservoir landslide in the upper reaches of Jinsha River

作　　者：谭海 王小毛 徐卫亚[2] TAN Hai;WANG Xiaomao;XU Weiya(Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,China;Institute of Geotechnical Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]长江勘测规划设计研究院,湖北武汉430010 [2]河海大学岩土工程科学研究所,江苏南京210098

出　　处：《武汉大学学报（工学版）》2021年第10期879-886,共8页Engineering Journal of Wuhan University

基　　金：国家重点研发计划项目(编号:2017YFC1501100);2019年湖北省博士后创新实践岗位项目。

摘　　要：本文针对金沙江上游某库区滑坡,从滑坡稳定性、滑坡运动规律和滑坡诱发涌浪灾害3个方面评估了滑坡的整体和局部稳定性,模拟了滑坡启动后的动力学过程,探讨了滑坡入水产生的涌浪对大坝的影响。滑坡在天然水位工况下基本稳定,在正常蓄水位工况下失稳滑动的可能性大,进一步建立了水库蓄水后滑坡的2种失稳模式:Ⅱ区整体滑动和Ⅱ区中下部滑动。在稳定性分析的基础上,采用潘家铮滑速计算方法,定量计算了滑坡从启动到停止的全过程,获得了各工况失稳滑动的滑速时程曲线和滑坡堆积形态。最后采用经验公式,对滑坡涌浪进行了预测。计算结果表明:水库蓄水后,各工况失稳滑动的滑速和滑距均较小,滑坡高速远程滑动的可能性小;滑坡产生的涌浪不会漫过坝顶,涌浪对大坝的影响小。Based on a reservoir landslide in the upper reaches of Jinsha River,the landslide overall and local stabilities are analyzed,the dynamic process after landslide start-up is simulated,and the impact of landslide surge on the dam is discussed from three aspects of landslide stability,landslide movement law and landslide induced surge disaster in this paper.The landslide is basically stable under the natural water level condition,but it is likely to slip under the normal water level condition.Two landslide failure modes after reservoir impoundment are further established:the whole sliding of zone Ⅱ and the middle and lower sliding of zone Ⅱ.On the basis of stability analysis,the whole process of landslide from initiation to deposition is quantitatively calculated by using Pan Jiazheng’s method,and the sliding velocity time history curve and accumulation form of the landslide are obtained.Finally,the landslide surge is predicted by empirical formula.The calculation results show that the slip velocity and slip distance of the landslide under various failure modes are small,and the possibility of high-speed and long-distance landslide is small after reservoir impoundment.The surge generated by landslide cannot overflow the dam crest,and the impact of landslide surge on the dam is small.

关 键 词：滑坡稳定性分析 失稳模式 运动规律 堆积形态 滑坡涌浪 

分 类 号：TU473[建筑科学—结构工程]