菲古坝顶溢流面板堆石坝运行期变形特性分析

Analysis of Deformation Characteristics of Face Rockfill Dam with Crest Overflow in Feigu Reservoir During Operation

以大坝监测数据为基础,对菲古水库坝顶溢流面板坝蓄水后运行期大坝变形和溢洪道泄槽错动分布规律进行分析和评价。运用数理统计、时空分布分析等手段,对库水位、气温和水温等环境变量进行了相关性分析。认为大坝坝顶水平变形和沉降量均小于安全警戒值;气温和库水位是影响大坝变形的主要环境因素;溢洪道泄槽错动量对温度十分敏感,但相邻泄槽变形协调,错动量较小,泄槽处于较安全状态;通过采用主堆石料混杂少量埋石砼的做法,减少坝顶溢洪道的不均匀沉降是可行的。

On the basis of the dam monitoring data,we analyze and evaluate dam deformation and dislocation distribution laws of spillway drain channels during operation upon the impounding of the face dam with crest overflow in Feigu Reservoir.The correlation analysis of environmental variables such as the reservoir water level,air temperature,and water temperature is carried out by means of mathematical statistics and spatiotemporal distribution analysis.It is concluded that the horizontal deformation and settlement of the dam crest are less than the safety warning values.Air temperature and the reservoir water level are the main environmental factors affecting dam deformation.The dislocation magnitude of the spillway drain channel is highly sensitive to temperature,but with coordinated deformation,adjacent drain channels have small disjunction momentum,and thus the spillway drain channel is in a safe state.We can reduce the uneven settlement of the spillway on the dam crest by mixing the main stone pile with a small amount of buried stone concrete.