Research on the crushing range of surrounding rock in special-shaped hole water bag blasting

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (11) : 131-138.

ZHANG Xuefu1,2， LI Ningjie1,2， ZHOU Jie1,2， HAN Fenglei1,2， ZHANG Jian1,2

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Abstract

In tunnel driving, the over-under-excavated values of smooth blasting, the uneven contour of excavation and low blasting efficiency are the most concerned problems in construction. Aiming at the problem of rock breaking mechanism by special-shaped hole water bag blasting, based on the theory of blasting. The calculation formula P_d=3028.4K_d^(-1.021) of hole wall impact force of special-shaped hole water bag blasting is fitted, and the calculation formula R_c=(P/N[P_r])^(1/α) (r_b+l) of surrounding rock crushing area is derived. Based on the tunnel in Zhengyang Town, Qianjiang District, Chongqing, and with the self-made drill bit as the tool, the reliability of the calculation formula is verified through the comparative experiment of special-shaped hole water bag blasting and conventional blasting and the numerical simulation of rock blasting damage threshold. The results show that the fitting accuracy of hole wall impact force formula is R^2=0.996, the theoretical value of surrounding rock crushing range formula is consistent with the measured value. This blasting method generates a smooth tunnel excavation profile even in complex rock joints, Radial decoupling coefficient K_d of explosive, and the increase of explosive content in ≤1.5 has little effect on the crushed area of surrounding rock, which mainly affects the fracture area.

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Tunnel blasting / Special-shaped hole / Water bag / Crushing zone

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ZHANG Xuefu1,2， LI Ningjie1,2， ZHOU Jie1,2， HAN Fenglei1,2， ZHANG Jian1,2. Research on the crushing range of surrounding rock in special-shaped hole water bag blasting[J]. Journal of Vibration and Shock, 2023, 42(11): 131-138

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