三峡地下厂房天锚作为桥式起重机吊装的重要设施，在投入生产之前采用电测法对其安全性进行了荷载试验检查，并对荷载试验过程中的天锚锚杆受力及其变化情况采用电测法进行了应变监测。监测成果显示，电阻应变计实测规律性明显，且测值均未超过设计允许范围，表明天锚是安全的。

The electrical measuring method is one of the methods to use for structural element ' s stress analysis in engineering. It ' s applied widely for its sizes is small, and measurement operation flexible, and accuracy high. The up-anchors of underground power house of TGP are important facilities used as the handing of a tower crane, so it must be examined in safety by loading experiment before using in production. All together, the stress and its change of up-anchors are monitored during the loading experiment. The achievements show that regularities are significant by real measurement using resistance strain gauges. The measured values are all in the allowable range. It shows that the up-anchors are safety.