古田溪三级大坝老化病害及其治理

古田溪三级钢筋混凝土平板支墩坝，建成蓄水至今已40多年，随着岁月的流逝，坝基帷幕防渗能力逐渐衰减，迎水面遭受到严重风化侵蚀，面板渗漏溶蚀不断加剧，表层碳化深度日益累进，坝体裂缝增生或扩展，面板强度大幅度降低。为了遏制大坝进一步遭受到老化病害的危害，确保大坝安全运行，采取了一系列针对性防护和加固措施。对该坝老化症状坚持定期检测分析，并及时进行治理，对于其他大坝具有一定的借鉴意义。

Deterioration and its treatment of Gutianxi Cascade-Ⅲ Dam

The Gutianxi cascade-III reinforced concrete facing buttress dam has been operated for more than 40 years. The anti-seepage capability of grouting curtain of dam foundation generally decreased as the time passed, so that the upstream dam surface was seriously weathered. The leakage solution of the face solution has worsened. The surface carbonation depth has increased, the cracks in the dam body have increased or extended and the strength of the face slab has intensively decreased. A series of protective and strengthening measures were taken to avoid the deterioration and to ensure dam safety and normal operation. The Gutianxi cascade-III hydropower plant performed periodic detection and analysis for the dam deterioration and timely took corresponding measures.