贵州油啥水库施工期洞式溢洪道安全监测分析  

Safety Monitoring Analysis of Tunnel Spillway during Construction Period of Yousha Reservoir in Guizhou Province

作　　者：刘田珂 黄平 孙彪 LIU Tian-ke;HUANG Ping;SUN Biao(Power China Guiyang Engineering Corporation Limited,Guiyang 550081,China)

机构地区：[1]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081

出　　处：《海河水利》2024年第10期71-74,共4页Haihe Water Resources

摘　　要：水库溢洪道作为重要泄水建筑物,其施工期健康稳定是后续正常泄洪的必要前提和安全保证。以在建油啥水库洞式溢洪道为例进行安全监测及分析,包括溢洪道洞身变形监测分析、钢筋受力监测分析、渗压及围岩-洞身衬砌之间的变形监测分析。结果表明,溢洪道洞身变形逐渐减小,结构趋于稳定,最大变形为-0.21 mm;各监测断面钢筋受力特征不同,由于结构自身重力和混凝土收缩性,导致测点钢筋主要以受压为主,但桩号Y0+276.00监测断面底板内侧钢筋受到2.57 kN的拉力;各监测断面的渗透压力及围岩-洞身衬砌间缝隙变化不大,溢洪道洞身出口处消能段基础开挖施工导致桩号Y0+276.00监测断面水压环境改变,出现负压。各监测数据正常,洞式溢洪道在施工期处于安全稳定状态。As an important discharge structure,the health and stability of the reservoir spillway during construction are necessary prerequisites and safety guarantees for subsequent normal flood discharge.Therefore,this article focuses on safety monitoring and analysis of the tunnel spillway of the Yousha Reservoir under construction,including deformation monitoring and analysis,reinforcement stress monitoring and analysis,seepage pressure and deformation monitoring and analysis between the surrounding rock and lining.The results show that the deformation of the spillway itself gradually decreases,and the structure tends to stabilize,with a maximum deformation of-0.21mm.The stress characteristics of the steel bars in each monitoring section are different.Due to the gravity of the structure itself and the shrinkage of the concrete,the steel bars at the measuring point are mainly under compression.However,the steel bars inside the bottom plate of the Y0+276.00 section are subjected to a tensile force of 2.57kN.The seepage pressure of each monitoring section and the gap between the tunnel lining and surrounding rock have not changed much.The excavation construction of the energy dissipation section foundation at the outlet of the spillway tunnel has caused a change in the water pressure environment of the Y0+194.00 section,resulting in negative pressure.All monitoring data is normal,and the tunnel spillway is in a safe and stable state during the construction period.

关 键 词：水库工程 洞式溢洪道 安全监测 变形分析 

分 类 号：TV698.11[水利工程—水利水电工程]