Abstract: FromJanuary to the beginning ofMarch 2007, the water level at Dongfeng hydropower station was above 960 m, and during this period, the temperature here was low. Under condition of lowtemperature and high water level, average horizontal displacement, especially the radial displacement of the damwas larger than the same periods in other years, and some of themwere the maximum in history. This paper, by introduction to this, with observation data, explained the influence of low temperature, high water level and time effect to damstructural safety. Hopefully, it would be useful in operation and deformation monitoring.

摘要： 2007 年1 月到3 月上旬, 东风水电站库水位一直维持在960 m 以上, 在该时段内, 坝体温度处于一个低温期。因此在高水位、低温度的环境作用下, 坝体水平位移尤其是径向位移比常年同期偏大, 个别测点的位移值超过历史值。本文通过对上述情况的简述, 用观测数据来说明低温高水位的运行工况以及时效因素对大坝结构安全造成的影响, 这有利于对今后运行期大坝变形监测的掌握。