地下厂房顶拱的实际工作状态分析

本文介绍并分析了我国若干大中型水电站地下厂房的长期原体观测资料。分析结果表明,不论是在应力数值方面或是在应力分布方面,实际观测值与按普氏理论算得的设计应力值之间均有较大出入;且顶拱钢筋应力随时间推移呈现与岩石流变曲线相似之持续而缓慢的增长,反映出顶拱在实际工作状态下具有时效特点。文中利用凯尔文（Kelvin）体与虎克（Hooke）体串联而成的标准粘弹性模型分析了作用于顶拱的流变山岩压力,并就改进顶拱的设计和施工方法提出了若干意见。

Behaviour Analysis of the Lined Top-Arch of Underground Hydro-powerhouse

This paper presents and analyses the long term prototype observational data of some large underground hydro-powerhouse in China. The analysis shows that in both the distribution and the magnitude of stresses, there exists a great difference between the value measured in prototype and the value designed by Protodyakonov's theory. All the reinforcement bar stresses measured in lined top-arch represent some time-effect, i.e. these stresses increase steadily and slowly with the time elapsed. A visco-elastic model of K-H in series is used by authors to analyse the rock pressure acting on a lined top-arch. In addition, some opinions for improving the design and construction of lined top-arch are suggested.