无损检测技术在密云水库白河主坝安全监测中的应用成果分析

Analysis of the Application Results of Non-Destructive Testing Technology in the Safety Monitoring of Baihe Main Dam of Miyun Reservoir

白河主坝是密云水库主要挡水建筑物,坝型为碾压式斜墙土坝。近年来,水库水位连创历史新高且持续高水位运行将成为常态化,这势必对水库大坝坝体的渗流和稳定产生一定影响。文章借助多种无损检测手段对其进行现场检查和检测,以综合评估大坝安全性态。高密度电法探测结果显示,白河主坝下游大部未见富含水区,少量含水区仅存于较大埋深覆盖层中;探地雷达检测结果表明,坝体内部材料总体均匀,仅在局部表层区域存在孔洞、不密实区等缺陷;由温度场法检测分析可知,坝体温度总体稳定,不存在渗漏大通道。综合分析大坝渗流正常、变形稳定、总体处于安全运行状态。

Baihe Main Dam is the main water retaining structure of Miyun Reservoir,with a roller-compacted inclined wall earth dam type.In recent years,the reservoir water level has reached historic highs,and continuous high water level operation is becoming the norm,which will inevitably have a certain impact on the seepage and stability of the dam body.This paper uses various non-destructive testing methods to conduct on-site inspection and testing,and comprehensively evaluate the safety status of the dam.The high-density electrical method detection results show that most of the downstream of Baihe Main Dam is not rich in water,and a small amount of water-containing areas only exist in larger depth cover layers.The ground penetrating radar detection results show that the internal materials of the dam body are generally uniform,and only defects such as holes and non-dense areas exist in local surface areas.The temperature field detection and analysis indicate that the dam body temperature is generally stable,and there is no leakage channel.The overall analysis shows that the dam’s seepage is normal with stable deformation,and it is in a safe operating state.