关键词: 碾压混凝土坝, 温度变形, 坝体弹模, 异常水平位移

Abstract: The abnormal horizontal displacement of section 7 of a RCC dam is analyzed in this paper. Based on the measured temperature field of dam body, the influence of the dam's temperature variation on horizontal displacement is calculated by finite element method, and the elastic modulus of dam body is retrieved by mixed model method. The results show that the influence of water level variation on horizontal displacement of section 7 is within a reasonable range. As the temperature field of dam is less affected by temperature, the influence of reservoir water level is relatively large. Therefore, horizontal displacement shows obvious correlation with reservoir water level. Considering the temperature drop of dam and the abrupt change of measuring values, there is no obvious trend displacement in the dam body. The trend displacement of dam foundation mainly occursed during storage. Since the normal operation, the downstream deformation of dam foundation is only about 1 mm, which does not affect the dam safety operation. The results of the study provide a reliable basis for dam safety evaluation.

Key words: RCC dam, thermal deformation, dam elastic modulus, abnormal horizontal displacement