广源水电站双曲拱坝结构稳定性分析与体形优化研究OA

To optimize the shape of the roller-compacted concrete double-curvature arch dam of Guangyuan Hydropower Station and evaluate its structural safety,a systematic analysis of dam stress,displacement,and abutment stability under multiple load cases was carried out based on the arch-cantilever load distribution method and the three-dimensional rigid body limit equilibrium method.The arch-cantilever load distribution method and the ADAO arch dam software system were adopted to simulate nine load combination cases and calculate the stress and displacement of the dam body.The anti-sliding stability of the dam abutments was analyzed using the three-dimensional rigid body limit equilibrium method.To address the problem of excessive local stress in the dam foundation,an enlarged foundation scheme was applied for improvement.The results show that the stress and displacement of the dam body meet the specification requirements;the stress control case is the combination of check flood level and temperature rise,and the displacement control case is the combination of empty reservoir grouting and temperature rise.The local tensile stress of the dam foundation is reduced to the allowable range after the foundation is enlarged by 4 m.The anti-sliding stability safety factors of the left and right dam abutments as well as faults f5 and f7 are all greater than the specification limits.The shape parameters of the arch dam are reasonable,and the structure is safe and reliable.The adopted stress analysis method and dam foundation treatment measures are effective,which can provide a reference for similar projects.