溪洛渡水电站左岸特大泄洪洞底板开挖光面爆破效果分析

Analysis on Smooth Blasting Effect in Bottom Excavation of Extra Large Spillway Tunnel in Left Bank of Xiluodu Hydropower Station

溪洛渡水电站泄洪洞规模庞大,洞室底板开挖受传统工艺水平制约,开挖的平整度、错台、超欠挖量较大,残孔率较低。通过改进工艺工法,研究制定了一套可操作性强、管理成效显著的工艺标准,对减少底板混凝土回填量,节省工程投资具有较大的实际意义。

Spillway tunnel at Xiluodu hydropower station is very large-sized and the tunnel bottom excavation is restricted by traditional technique level resulting in poor excavation flatness,excavation dislocation,large overbreak and underbreak,low half hole ratio. By improving technique method,a set of highly operable process standards with remarkable management results are developed to reduce tunnel bottom concrete backfill. It is significant to project investment saving.