周宁水电站地下厂房埋藏较深，地质条件为完整的花岗岩。为控制爆破对岩壁吊车梁的震动影响，经现场测试及回归分析得到相关的经验公式，根据经验公式，反算控制药量，确保了地下厂房岩壁吊车梁的安全。另外，通过测试数据比较分析，试图定量分析出预裂缝的减振效果，对相似条件的地下厂房开挖具有一定的参考价值。

The underground power house of Zhouning hydropower station has deep cover and is located in intact granite. In order to minimize the impact on the rock crane beam imposed by blasting, related empirical formulas are obtained by means of insitu tests and regression analysis. The controlled charging quantity is back calculated on basis of the empirical formulas so as to ensure the safety of the rock crane beam of the underground power house. Furthermore, efforts are made to make quantitative analysis on the vibration reducing effect of the presplit cracks. The paper can provide reference for the excavation of similar underground power houses in the future.