关键词: 地下洞室, 边墙, 爆破振动, 放大效应, 四边简支板

Abstract: By analyzing the field test data of blasting vibration of underground caverns in Taohuazui mining area, the characteristics of the peak particle velocity propagation attenuation on the side wall induced by blasting excavation in underground caverns were found, which presented a larger amplification effect in the vicinity of the source and the central area of the side wall. A dynamic analytical model of simply supported slabs with four sides was established. Furthermore, according to dimensional analysis method, a formula for predicting the peak particle velocity of side wall in underground cavern blasting was deduced in the case of four side constraints of side wall. Finally, the measured data were substituted into the Sadovsky formula and the formula deduced in this paper for linear calculation. The average errors between the predicted values by the Sadovsky formula and by the formula developed in this paper and the measured values were 30.7% and 5.1%, respectively. These results indicate that the proposed formula can accurately reflect the amplification effect of the peak particle velocity in the side wall of underground cavern blasting. In particular, it can accurately predict the peak velocity of blasting vibration in a region where the amplification effect is significant, and provides a reference for better control of side wall blasting vibration damage.

Key words: underground caverns, side wall, blast vibration, amplification effect, quadrilateral simply supported slab