湖南镇水电站扩建工程高边坡控制爆破及后山坡处理

High side-slope controlled blasting and back hillside treatment of the extension work of the Hunanzhen Hydropower Station

湖南镇水电站扩建工程的厂房基础开挖，由于岩石柱状节理、顺坡裂隙发育，并紧靠坝脚线，开挖安全要求高，因此采用毫秒微差控制爆破，山坡处理采用“上撬下固，上锚下护，边挖边护，排水同步”的处理原则，确保了工程的进度和施工的安全。

The millisecond delay control blasting has been adopted in the powerhouse foundation excavation of the extension work of the Hunanzhen Hydropower Station because the rock prismatic joints and downslope fissures are welldeveloped and the excavation is immediately close to the dam toe so that the high safety of excavation is required.The treatment principles of 'prizing off in the upper side and reinforcing in the lower side, anchoring in the upperside and protecting in the lower side,excavating while protecting, and drainage at the same time' have been adoptedin the slope treatment. Therefore, the project progress and construction safety have been guaranteed.