Abstract: 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.

Key words: anchored crane beam, in situ model test, underground power house