白鹤滩水电站地下厂房岩壁吊车梁设计与施工期关键技术

Key technologies for design and construction of rock-bolted crane beam in underground power⁃house of Baihetan hydropower station

白鹤滩水电站地下厂房岩壁吊车梁采用刚体极限平衡法设计,有限元法复核,验证了岩壁吊车梁结构断面和锚杆设计参数的合理性。受复杂地质和高地应力的影响,局部洞段岩壁吊车梁开挖成型较差,因此提出了岩台开挖施工和补强加固的技术措施。原型观测结果分析表明,岩壁吊车梁锚杆应力、岩梁与围岩开合度满足要求。荷载试验期间,各监测数据增量均较小,验证了岩壁吊车梁设计方法和施工技术措施的合理性。

The rock-bolted crane beam in underground powerhouse of Baihetan hydropower station is designed by use of rigid body limit equilibrium method and checked by finite element method,which verifies the rationality of design parameters of structural section and bolt.Due to the influence of com⁃plex geology and high in-situ stress,the excavation of rock-bolted crane beam in local area is difficult,so the technical measures of rock platform excavation and reinforcement are put forward.Analysis of the prototype observation results shows that the bolt stress of rock-bolted crane beam and the opening be⁃tween crane beam and surrounding rock have met the requirements.During the load test,the increase of monitoring data is small,which verifies the rationality of the design method and construction measures of rock-bolted crane beam.