某水电站古滑坡体滑速涌浪分析

Sliding Speed and Surging Height Analysis of Ancient Landslide Beside a Hydropower Station

某水电站古滑坡体位于库首右岸的峡谷进口段,总方量约1 327×10~4 m^3,历史上该滑坡体曾多次发生滑动,目前处于临界稳定状态。古滑坡体下游侧边缘距离水电站建筑物较近,水电站扩建过程中施工因素及扩建后水库水位上升对古滑坡体的稳定影响较大,一旦滑坡体再次启动滑入水库,激起的涌浪对该工程威胁较大。基于潘家铮滑速计算方法,对计算式进行改进,编写了Fortran计算程序,运用改进后的潘家铮滑速计算方法分析了该古滑坡体的加速度、速度的变化规律;分别采用潘家铮涌浪计算方法和水科院经验公式预测了滑坡体入库激起对岸涌浪高度和坝址处涌浪高度,研究成果对工程建设具有指导意义。

The ancient landslide of a certain hydropower station is located at the entrance of the canyon on the right bank of the project, and the total volume is about 13 270 000 m^3. The landslide has been slipping many times in history, and now it is in critical stable state. The lower side edge of the ancient landslide is close to the building of the hydropower station, the construction factors during the expansion process and the rise of reservoir water level after the expansion have great influence on the stability of the ancient landslide. Once the landslide body starts to slide into the reservoir again, the surging waves have large threat to the project. Base on the sliding speed calculation method of Pan Jiazheng, this paper has improved the calculation formula, written the Fortran computing program, and analyzed the acceleration and velocity changes of the ancient landslide with the improved Pan Jiazheng sliding speed calculation method. By using Pan Jiazheng surge calculation method and the experience formula of the Institute of water conservancy, the surge height of the opposite bank and the surge height of the dam site are predicted. It has some guiding significance to the construction of project.