富水水库大坝变形监测与安全性分析

Deformation Monitoring and Safety Analysis of Fushui Reservoir Dam

富水水库为大(1)型水库,已运行近57年,为了解大坝运行情况,分析大坝变形监测资料、评估大坝安全性是非常必要的。文章对富水水库大坝2015—2019年变形监测数据,采用过程线、特征值、分布图、沉降速率等方法进行综合分析。结果表明,大坝坝体位移受坝高影响较为明显,表现为坝体中部位移大于两端;各测点在库水位高时向下游变形,库水位下降后向上游变形,位于坝身较高的上游及坝顶测点变形量大于下游测点变形量;垂直位移以持续下降方向变化为主,平均沉降速率在10^(-3) mm/d数量级,未出现明显不利于大坝安全的异常现象,大坝性态基本正常,为富水水库大坝后期安全运行管理提供了科学参考。

Fushui Reservoir is a large(1)reservoir,which has been in operation for nearly 57 years.In order to understand the dam operation,it is necessary to analyze the dam deformation monitoring data and evaluate the dam safety.In this paper,the deformation monitoring data of Fushui Reservoir Dam from 2015 to 2019 are comprehensively analyzed by means of hydrograph,eigenvalue,distribution map and settlement rate.The results show that the displacement of the dam body is obviously affected by the dam height,which shows that the displacement in the middle of the dam body is larger than that at both ends.Each measuring point deforms to the downstream when the reservoir water level is high,and then to the upstream after the reservoir water level drops.The deformation of the measuring point located at the upper reaches of the dam body and at the top of the dam is greater than that of the downstream measuring point.The vertical displacement mainly changes in the direction of continuous decline,and the average settlement rate is in the order of 10^(-3) mm/d.There is no abnormal phenomenon that is obviously unfavorable to the dam safety,and the dam behavior is basically normal,which provides a scientific reference for the later safe operation and management of fushui reservoir dam.