锦屏一级水电站，是雅砻江干流上的控制性水库，坝址区位于州内木里、盐源两县邻接处的普斯罗沟峡谷段，开发河段内滩多流急、不通航，电站装机容量3600MW，多年平均年发电量166.2亿kW6.。锦屏一级上游滑坡体上至楞古水电站的中坝址，下至楞古水电站的下坝址。2013年3月第一台机组运行发电。锦屏一级水电站上游河段存在滑坡体及变形体失稳形成堰塞湖的隐患，且堰塞体溃决的可能性较大，即锦屏一级大坝安全面临上游垮山洪水的严重威胁。本文首先对滑坡及变形体进行不同规模失稳破坏后的滑坡堰塞体堵江及溃决的分析预测，继而选用合适的数值模拟方法构建溃堰洪水计算模型，对上游垮山堵江溃决洪水过程进行分析，根据计算分析成果拟定水库调度方案，并对垮山洪水对大坝安全的影响进行分析，继而提出相应的工程防患措施及建议，为锦屏一级水电站的安全运行提供支持。围绕上述研究思路，本文主要开展以下四方面的研究：（1）分别从失稳破坏规模、堰塞体高度、堰塞体稳定情况及稳定时间、堰塞体溃决分析等四个方面进行潜在不稳定滑坡及变形体失稳破坏后堰塞分析，本文选取上游河段中的5个主要不稳定体及滑坡体，对其可能失稳破坏后堰塞体的堆积形态及溃决方式进行了分析预测。（2）利用DAMBRK模型，构建锦屏一级上游河道溃堰大水的计算模型，并采用实测数据对溃堰洪水的计算模型进行验证；选择具有代表性的堰塞体，并拟定计算方案，针对不同计算方案的溃堰大水进行计算分析，推演各方案下的溃口洪峰流量过程和溃堰洪水。（3）根据上游垮山溃堰洪水计算结果，分析堰塞湖蓄至堰顶高程的时间，在此基础上，根据锦屏一级水库的运行方式，选择水库在正常蓄水位1880m、防洪限制水位1859.06m和死水位1800m运行三种工况，结合上游垮山洪水的来流情况，分析拟定水库调度方案。（4）根据上游垮山溃堰洪水计算结果，取坝前水位1889.65m进行垮山洪水对坝体应力及坝肩稳定的影响计算，分析垮山洪水对大坝安全的影响，并提出相应的工程防患措施及建议。
Jinping first-level hydropower station is the control reservoir on the Yalong River, the dam area is located in Pusiluogou Canyon section. Navigation in the development beach of the river, power plant installed capacity of 3600MW, annual average annual power output of 16.62 billion kW ? h. The upstream landslide body of Jinping first-level hydropower station is from Lenggou hydropower station in the dam site, down to the Lenggou hydropower station under the dam site. In March 2013 the first unit was operated to generate electricity.There is a danger of landslide and deformed body in the upper reach of Jinping first-stage hydropower station to form the barrier lake, and the possibility of the dam body collapse is large, that is to say, the Jinping first-class dam is facing the serious threat of the collapse mountain flood. In this paper, the landslide and the deformed body are analyzed and predicted after the landslide and the deformed body are destructed and destructed. Then the appropriate numerical simulation method is used to construct the model of the floodwater in the upstream. And the impact of the flood protection on the dam safety is analyzed. Then, the corresponding measures and suggestions are put forward to support the safe operation of the Jinping I Hydropower Station.Around the above research ideas, this paper mainly carried out the following four aspects:(1) The unstable landslide and the dam failure analysis of the deformable body are analyzed respectively from four aspects, such as the destabilization failure scale, the height of the dammed body, the stability of the dammed body and the stability time, and the analysis of the collapse of the dam body. Five main unstable bodies and landslides in the upper reach are selected and analyzed, and the accumulation patterns and failure modes of the dammed bodies are analyzed.(2) The DAMBRK model is used to construct the model of the floodwater in the upper reaches of the Jinping River, and the model is validated by the measured data. The representative dammed body is selected and the calculation scheme is calculated. The calculation of the flood- The process of the flood peak flow and the evolution of the flood in the downstream are analyzed.(3) According to the calculation result of upstream collapse weir flood, the time of dammed lake to dam height is analyzed. On the basis of this, according to the operation mode of Jinping first-class reservoir, choosing the normal water level of 1880m, flood control Limit water level of 1859.06m and dead water level of 1800m, combined with the flow situation of upstream collapse mountain flood, analyze and formulate reservoir operation plan.(4) According to the calculation result of the upstream collapse weir flood, the influence of the cross-mountain flood to the dam's stress and abutment stability is calculated by taking the water level of 1889.65m before the dam, and the influence of the flooding on the dam safety is analyzed. Measures and suggestions of engineering prevention measures.
