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１９７６年地震时密云水库白河土坝保护层发生滑坡。文中阐述滑坡的范围和形态，对坝上取得的地震记录和地震过程中大坝的反应做了分析。 根据保护层砂砾料的组成、密度和细料的三轴动力试验成果指出这种料属于易液化料，在地震荷载作用下由于孔隙水压力的升高而使抗剪强度大幅度降低是这次滑坡的主要原因。考虑砂砾料液化的边坡稳定分析资料证实这一结论。 文中最后介绍了大坝的加固措施，并对地震区砂砾料筑坝问题提出了若干观点和建议。
Landslide occurred at the protective cover of Baihe Dam in Miyun Reservoir during the 1976 earthquake. The article describes the scope and shape of the landslide and analyzes the seismological records obtained during the dam and the response of the dam during the earthquake. According to the composition, density and the triaxial dynamic test results of the gravel material, it is pointed out that the material belongs to the liquefiable material and the shear strength is drastically reduced due to the increase of the pore water pressure under the earthquake load The main reason for landslide. Slope stability analysis considering the liquefaction of gravel material confirms this conclusion. Finally, the article introduces the reinforcement measures of the dam, and puts forward some opinions and suggestions on the dam of gravel material in the earthquake area.