瑞士塞拉拱坝的修复

Experiences learnt from the rehabilitation of Serra dam

通过监测发现瑞士塞拉拱坝坝体明显向上游偏移并伴有坝顶不均匀沉降,坝体混凝土出现不均匀开裂,特别是下游坝趾附近还发现了可能威胁拱坝安全的裂缝,同时拱坝的泄洪能力也不满足新修订的防洪标准。在对塞拉拱坝进行修复时,考虑到拱坝长期安全性决定在原有拱坝下游几米处修建一座新坝以替代原有拱坝。修复重建工作包括了原有坝体的拆除、新坝施工建设、水电站在施工期间的运行管理和水文预报模型的建立等。塞拉拱坝的修复重建对我国水利水电工程修复有借鉴意义。

By monitoring, the concrete of the Swiss Serra arch dam was found to have an irreversible up- stream displacements and a non-uniform subsidence of the dam crest, besides non-uniform cracks, especial- ly along the downstream perimeter, which may threaten the safety of the dam. At the same time, the dis- charge capacity of the arch dam does not meet the new flood control standard. Considering the long-term security, in the Serra dam repair, the construction of a new dam few meters downstream of the existing one was decided. The construction work includes the demolition, construction, hydropower station operating and hydrological forecast model developed during the construction. The Serra dam reconstruction is of cer- tain significance to the restoration of hydropower projects in China.