锦屏一级水电站拱坝整体稳定性分析和抗裂设计

锦屏一级水电站拱坝坝高305 m,为世界第一高拱坝,由于拱坝坝址区地形地质条件不对称,同时存在大量的缺陷,造成大坝受力条件较为恶劣,可能导致坝体开裂。为此,从拱坝整体受力稳定的角度深入分析了各种可能的开裂因素,并据此提出抗裂设计措施。实践表明:由于充分利用了拱坝的自我调整能力,并综合运用了增强混凝土抗裂性能、优化体型、加强对地形和地质不对称条件的处理、增强河床部分坝体刚度等措施,使坝体抗裂性能有较大提高。

Overall stability analysis and anti-crack design of arch dam of Jinping I Hydropower Station

The 305m high arch dam of Jinping I Hydropower Station is the highest one in the world . Due to the unsymmetrical geological and topographical conditions and a large quantity of geological defects at the dam site, the mechanical condition of dam body is unfavorable, which may lead to dam crack. Aiming at the unfavorable factors that could lead to dam crack, we studied the possible causes from an integral dam stability perspective, and put forward some anti-crack design solutions. The practice showed that the full utilization of arch dam self-adjustment performance and the comprehensive application of measures such as adopting high crack-resistant concrete, body shape optimization, treatment to the unsymmetrical geological and topographical conditions, as well as increasing stiffness of dam body in the river bed area, improved the anti-crack ability of the arch dam.