地下厂房岩壁吊车梁及邻近层爆破开挖施工技术的探讨

Summary of Excavation Technology for Crane Beam on Rock Wall of Underground Powerhouse

抽水蓄能电站岩壁吊车梁是整个地下厂房系统的关键部位,岩壁梁岩台爆破开挖成型效果直接影响梁体受力和运行.岩壁梁混凝土浇筑完成后,相邻部位爆破开挖过程中如何避免爆破对岩壁梁结构造成振动损伤是蓄能电站施工质量控制重点.文中以文登抽水蓄能电站为例,研究地下厂房岩壁梁及邻近层的爆破开挖中采用的光面爆破、梯段爆破、预裂爆破技术,进一步总结隧道爆破开挖超欠挖和振动速度控制技术,为类似工程提供参考.

The crane beam on the rock wall of pumped storage power station is the key part of the whole underground power house system. The forming effect of the rock wall beam and rock platform blasting excavation directly affects the stress and operation of the beam body. After the concrete pouring of the rock wall beam is completed, how to avoid the vibration damage of the rock wall beam structure caused by the blasting excavation of the adjacent parts is the key point of the construction quality control of the power station. Taking Wendeng pumped storage power station as an example, this paper studies the smooth blasting, bench blasting and presplitting blasting technology used in the blasting excavation of the rock wall beam and adjacent layers of the underground powerhouse, and further summarizes the over under excavation and vibration speed control technology of the tunnel blasting excavation, so as to provide reference for similar projects.