Stability Evaluation and Surge Analysis of the Qd04 Toppling Deformation Body in Reservoir Area of Maerdang Hydropower Station in the Yellow Rive
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 stabil-ity,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(Morgen-stern 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 con-servation 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.
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