黄坛口大坝伸缩缝性态异常的分析

ANALYSIS ON ABNORMAL BEHAVIOR OF EXPANSION JOINTS IN HUANGTANKUO DAM

黄坛口大坝２６号坝段二侧伸缩缝在蓄水运行多年后发生异常变形。变形量虽微小但持续３０年至今仍无明显收敛迹象，实属国内外所罕见。它是否会影响到大坝安全？是什么原因产生的？今后发展趋势又如何？本文就此作了具体分析，认为是由部分坝体横缝灌浆加上右坝肩地质条件不理想所引起的。本文对今后混凝土重力坝的设计、施工及安全管理可能有一定参考价值。

The expansion joints on both sides of dam block No. 26 exhibit an abnormal behavior after 12 years' operation. A rare phenomenon is that the very small deformation has been lasting for 30 years up to now. It is necessary to investigate the effect of the phenomenon on the dam safety and the cause of it? It is pointed out that the grouting of expansion joints and the unsatisfactory geologic condition of the right bank are the most important factors. The present study is of reference value to design. construction. and operation of gravity dams.