察汗乌苏面板堆石坝运行期坝体渗压变化分析

The seepage pressure variation law and cause analysis of dam during the operation period of Chahanwusu concrete faced rockfill

察汗乌苏面板堆石坝自水库下闸蓄水以来正常运行至今,期间最高库水位1649 m,最低库水位1620.07 m。为监测察汗乌苏大坝坝体渗压,共设置4个监测断面,分别在面板下垫层料区、坝基与堆石体结合部位及趾板附近安装振弦式渗压计进行监测。选择坝体中部典型断面坝左0+202 m断面,对其不同部位渗压计运行期测值进行分析,通过相关性检验与线性回归拟合等方法,明确了典型断面各部位渗压测值与库水位、环境温度、时间推移的相关关系和受影响程度,并对其形成原因作出推论。

Chahanwusu concrete faced rockfill dam had been in normal operation since the release of the reservoir for water storage,during this period,the maximum reservoir water level was 1649 m and the minimum reservoir water level was 1620.07 m.In order to monitor the seepage pressure of Chahanwusu dam,four monitoring sections were set up,vibrating wire osmometers were installed respectively in cushion material area under the face slab,the joint between the dam foundation and rockfill body and near the toe slab for monitoring.The left 0+202 m section of typical section in the middle of dam was selected to analyze the measured values of osmometers in different parts during operation period,through correlation test and linear regression fitting and other methods,clarified the correlation and influence degree of the seepage pressure measured values of in various parts of typical section to reservoir water level,ambient temperature and time passage,and inferred the causes.