白鹤滩水电站高拱坝抗震措施设计研究

Measures Research on Seismic Design for High Arch Dam of Baihetan Hydropower Station

白鹤滩水电站拦河坝为椭圆线型混凝土双曲拱坝,最大坝高289m。工程场址区的地震基本烈度为Ⅷ度,基岩水平地震动峰值加速度为451gal,设计地震水平加速度达406gal,校核地震水平加速度高达481gal,同时坝基地质条件复杂,两岸地形不对称,坝身孔口多,其抗震措施设计难度较大。通过在设计过程中进行的大量抗震措施研究,提出了包括“设置垫座与扩大基础结构、配置坝面抗震钢筋、加强基础锚固与灌浆处理、软弱结构面置换处理”等综合的抗震措施。

The barrage dam of Baihetan Hydropower Station is an elliptical Concrete Double-Curved Arch Dam with a maximum dam height of 289m.The basic seismic intensity in the project site area is degree,the peak horizontal seismic acceleration of bedrock is 451 gal,the design seismic horizontal acceleration is 406 gal,and the checked seismic horizontal acceleration is 481 gal.The geological conditions of dam foundation are complicated,the topography of both banks is asymmetric,and the dam body has many orifices,so it is difficult to design seismic measures.Through a great deal of research on anti-seismic measures in the design process,comprehensive anti-seismic measures including“setting cushions and enlarging foundation structure,allocating anti-seismic reinforcement on dam surface,strengthening foundation anchorage and grouting treatment,replacement treatment of weak structural plane”are put forward in this paper.