黄河玛尔挡水电站库区Qd04倾倒体稳定性评价及涌浪分析

Stability Evaluation and Surge Analysis of the Qd04 Toppling Deformation Body in Reservoir Area of Maerdang Hydropower Station in the Yellow Rive

玛尔挡水电站库区发育的Qd04倾倒体距离上游抽水蓄能电站下水库进水口较近,考虑到该倾倒体潜在失稳体积较大,宏观稳定性较差,水库蓄水后可能沿软弱面或折断面发生失稳,准确评价其稳定性及涌浪风险至关重要。为了准确评价该倾倒体稳定性,分析涌浪情况,采用M-P(Morgenstern-Price)法进行稳定性分析,并采用常用的3种滑速计算方法与3种涌浪计算方法9种组合进行涌浪计算,使用数值模拟法对涌浪值进行验证。结果表明:结合新滩滑坡实测的涌浪数据,得出使用经验公式法时采用能量守恒法计算滑速和潘家铮法计算涌浪高度的组合计算成果更贴近实测值,即在死水位、正常蓄水位时倾倒体整体失稳产生涌浪至上游抽蓄电站的涌浪高度分别为11.3、11.5 m。研究成果可为玛尔挡水电站库区相关工程的风险预测提供借鉴。

The Qd04 toppling deformation body developed in the reservoir area of the Maerdang hydropower station is relatively close to the inlet of the lower reservoir of the upstream pumped storage power station.Considering the large potential instability volume and poor macroscopic stability,it is crucial to accurately evaluate its stability and surge risk after the reservoir is inundated,as instability may occur along weak or broken sections.In order to accurately evaluate the stability of the toppling deformation body and analyze the surge,this paper adopts the M-P(Morgenstern Price)method for stability analysis,and uses 9 combinations of 3 commonly used sliding speed calculation methods and 3 surge calculation methods for surge calculation.At the same time,numerical simulation method is used to verify the surge value.Based on the measured surge data of the Xintan landslide,it is concluded that when using the empirical formula method,the combined calculation results by using the energy conservation method to calculate the sliding speed and the Pan Jiazheng method to calculate the surge height are closer to the measured values.That is,the surge heights generated by the overall instability of the toppling deformation body at the dead water level and normal water storage level are 11.3 m and 11.5 m,respectively,for the upstream pumped storage power station.The study results can provide a reference for the risk prediction of related projects in the reservoir area.