叶巴滩水电站深卸荷置换洞爆破开挖工艺研究OA

The construction environment and topography of the deep unloading and replacement tunnel of the Yebatan Hydropower Project Dam are complex.This project mainly involves excavating four types of loose unloading rock masses,with relatively poor surrounding rock quality.During construction,there is a possibility of radioactive harmful gas from radon and rock bursts,requiring enhanced smoke ventilation and protection.During construction,blasting is carried out in the tunnel chamber followed by ventilation and smoke exhaust.The specific process is:first measure and drill holes,then charge explosives for networked detonation,followed by ventilation and smoke exhaust,risk removal support,and finally mucking and bottom cleaning for the next excavation cycle.By strictly controlling blasting parameters and construction quality,such as residual hole rate and particle vibration velocity,the blasting excavation of the deep unloading and replacement tunnel ensures a good overall effect and meets the design requirements.