关键词: 高心墙堆石坝, 参数反演, 有限元计算, 变形倾度, 裂缝

Abstract: In the numerical simulation of earth-rock dam, accurate and reliable mechanical parameters of dam material are the important basis for dam deformation prediction and dam safety evaluation. Based on the monitored deformation data of Luding core wall rockfill dam, the rheological parameters of rockfill and core wall materials are inversed in this paper. Combined with the actual filling and impoundment process of the dam, the numerical simulation is carried out, and the stress, deformation and differential settlement of the dam after completion and impoundment are analyzed. The results show that the obtained stress and deformation of the dam based on the inversed parameters are in good agreement with the actual situation, and the settlement and principal stress of the dam at the completion and during the impoundment period are within the allowable range. At the completion, the deformation inclination of the dam crest is less than 1%. During the impoundment period, the deformation inclination of the dam crest area increases due to the wetting deformation of the upstream rockfill material. Moreover, the deformation inclination of the dam crest axis is larger than that of the upstream and downstream sides, and the deformation inclination of the dam crest at the middle of the valley is the largest, but it does not exceed 3%, that means there would be no longitudinal cracks, which is consistent with the actual situation. The research results can well predict the stress, deformation and crack of the dam body, which provides important support for dam safety evaluation.

Key words: high core wall rockfill dam, parameter inversion, finite element calculation, deformation inclination, cracks