Abstract: Until now, the concrete dams which are built in 1950s and 1960s have been in operation for more than 40 years. The durability of dams are affected by factors such as foundation deterioration, erosion and abrasion, freeze-thaw and frost heave, surface carbonation, leakage, corrosion, sulfate attack, cracks, loss of hydraulic machinery, reservoir sedimentation etc. Even worse, some dams encounter safety and stability problems as serious aging. After reinforcement and scientific operation, the dams are in normal condition now. In order to extend the service life of the dams, analysis on durability factors should be enhanced. As well, engineering control measures and appropriate adjustments to operation mode should be combined. Finally, timely elimination of major aging diseases and damage to dam durability should be carried out.

摘要： 20世纪50~60年代兴建的混凝土坝，在长达40多年的运行历程中，其耐久性遭受到地基劣化、冲磨空蚀、冻融冻胀、表层碳化、渗漏溶蚀、硫酸盐侵蚀、裂缝、水工机械衰损、水库淤积等因素的影响，有的老化病害比较严重，个别曾影响到大坝的安全稳定。经过维修加固和科学调度，这些大坝如今运行状态仍属正常，没有因老化病害致使承载能力和使用功能丧失而退出运行的事例。需继续加强影响大坝耐久性因素的分析研究，将工程治理措施与适当调整运行方式相结合，及时消除重大老化病害，避免或减少大坝耐久性遭受损害，以延长大坝的正常使用寿命。