摘要： 着重分析镜泊湖地下厂房顶拱肋梁运行30 多年来存在的缺陷以及造成缺陷的原因，通过对原型观测资料的分析,获得了对类似工程具有参考价值的几点建议。

Abstract: This text draw the emphasize on analyzing the defects of top arch rib beam in Jingbo lakes’ underground powerhouse which started operation 30 years ago, as well as the causes reasons. Based on analyzing the original observation data, several suggestions of reference value for similar projects were advanced.