1. School of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing100083,China; 2. State Key Lab of GeoMechanics and Deep Underground Engineering,Beijing 100083,China
Generally, the blasting vibration of cut holes is the biggest in the blasting construction of metro running tunnel. In order to reduce the blasting vibration velocity, through horizontally arranging five to seven presplitting holes above cut holes of 600mm, the cracks and fracture zones induced by presplitting holes blasting with different charge could reduce and prevent the shock waves of cut holes blasting spreading upward, and the blasting vibration induced by presplitting holes is also small, finally the overall blasting vibration velocity was reduced successfully. The research results showd that: when adopted presplitting blasting, the largest particle vibration velocity on vault is in Z direction and the largest particle vibration velocity in crossrange is in Y direction. Compared with the original scheme, in the case of equal circulating footage, total charge and total hole number, for the vault, the effect of vibration reduction with presplitting blasting of slotted cartridge of five holes is the most obvious, but for the crossrange, the presplitting blasting of five holes generic package is the best choice; when adopted slotted cartridge to presplitting blasting, the blasting vibration on the vault and crossrange increased with the increasing of total charge of presplitting holes. The actual situation on site should be considered synthetically, the reasonable vibration reduction measures may ensure the construction safe and efficiency.
杨仁树;车玉龙;冯栋凯;王强勋. 切缝药包预裂爆破减振技术试验研究[J]. , 2014, 33(12): 7-14.
YANGRenshu;CHEYulong;FENGDongkai;WANGQiangxun. Experimental research on the technology of blasting vibration reduction with presplitting blasting of slotted cartridge. , 2014, 33(12): 7-14.