论述了美国比弗大坝升级改造的原因,并通过降低水库运行水位、开展风险评估及加固处理等措施进行了险情应急处理。介绍了溢洪道加高加固、泄水建筑物管道更新和闸门重构、左坝肩下游滤排水系统设置等升级改造方案,简述了具体的施工步骤。大坝的升级改造解除了险情,并在整个项目实施期间,重点关注了环境影响。 The reasons for the upgrading of the Beaver Dam in the United States are discussed. Emergency treatment is carried out by reducing the reservoir water level, carrying out risk assessment and strengthening treatment. The upgrading and reconstruction schemes of spillway heightening and reinforcement, pipeline renewal and gate reconstruction of spillway buildings, and filtration and drainage system of the downstream dam abutment are introduced. Concrete construction steps are also briefly described. Upgrading of the dam relieved the danger and focused on the environmental impact throughout the project.