小湾水电站地下厂房岩锚梁现场试验研究

小湾水电站地下厂房是目前世界上最大的地下厂房之一，采用了岩锚吊车梁结构形式，厂房开挖跨度和高度分别为 28.30 m和79.88 m。由于岩锚梁通过两条宽度为0.5～8.5 m的陡倾断层，其施工期与运行期的稳定性成为关注的问题之一。在厂房洞室群的尾水闸门室中，选择具有相似工程地质条件的区域进行了现场模型试验研究，包括主要监测仪器的布置和加卸载过程设计，并对监测结果进行了分析。模型试验表明岩锚吊车梁承载能力满足设计要求，安全性有保障。

Study on in-situ test of rock-bolted crane girder in Xiaowan Hydropower Station

The anchored crane beam is used in the underground power house of Xiaowan Hydropower Station in which the generator room, one of the biggest rooms under construction, is 28.3 m in width and 79.88 m in height. Two faults with width ranging from 0.5 to 8.5 m and in high dip angle cross the generator room and the concrete crane beam. Therefore, the stability of the rock-bolted crane girder needs to be studied before the construction. This paper introduces the in situ model test that is carried out in the draft-tube gate room with the similar engineering geology condition. The setup of the monitoring instrument and the process of loading are included. The monitoring data are carefully analyzed; and the model test results demonstrate that the anchored crane beam can work at full capacity and its stability is guaranteed.