Abstract: Due to the influence of columnar joint basalt, interlayer dislocation zone C4 and C5, fault and high ground stress, the quality of excavation face at the rock-bolted crane girder is poor. In particular, overbreak of the downstream rock wall is common, and the maximum overbreak height below the inflection point of the wall seat is 6 m. Aiming at different defect forms of the rock-bolted crane girder, reinforcement measures are taken, such as support, structure repair and arm support. And the reinforcement measures are analyzed and evaluated.

Key words: rock-bolted crane girder, columnar joint, interlayer dislocation zone, high ground stress, defect repair

摘要： 白鹤滩水电站右岸尾水管检修闸门室岩壁吊车梁部位受柱状节理玄武岩、层间错动带C4及C5、断层和高地应力影响，开挖面局部成型质量较差，尤其是下游侧岩壁超挖情况普遍，壁座下拐点以下最大超挖高度达6 m。针对岩壁吊车梁不同缺陷形态，采取支护加强、结构修补、护臂支撑等加固措施，并对加固措施进行分析评价。

关键词: 岩壁吊车梁, 柱状节理, 层间错动带, 高地应力, 缺陷修补