预裂爆破技术在某洞库高直边墙开挖中的应用研究

以某洞库工程主洞室中层开挖施工为背景,洞室基岩为中粗粒花岗岩,其间穿插其它岩脉,如何保证安全和洞库工程的成型质量最为关键。在高直边墙中,采用预裂爆破技术,在对中层开挖方案研究的基础上,通过试验确定了预裂爆破参数和围岩Q值的选取,成功实现了大型洞室高直边墙预裂爆破,大大提高了洞库工程成型质量,并确保了安全。

Study on Application of Excavation for High Straight Wall in a Cavern with Pre-splitting Blasting

Taking the excavation in the middle of major cavity in a cavern project as the background, the bedrock thereof is coarse-grained granite with other dykes interspersed therein, thus the key points most important are to guarantee the safety and control the forming quality of the cavern. For the high straight wall, pre-splitting blasting technique was applied in such manner that, based on the study on the middle excavation scheme, the pre-splitting blasting parameters were defined and the Q value of surrounding rock selected by testing so as to implement pre-splitting blasting on high straight wall of large cavern successfully and improve the forming quality thereof with guarantee of safety. This can be for reference to similar works.