Research of rock blasting seismic energy radiation and its dependence on blasting source and free surfaces
LI Yongzhen1, 2, LU Wenbo1, 2, WANG Yang1, 2, CHEN Ming1, 2, YAN Peng1, 2
(1. State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan, Hubei 430072, China;
2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University,
Wuhan, Hubei 430072, China)
Abstract： To examine the impact of blasting source and free surface conditions on the energy proportion of rock blasting seismic waves, this study conducted two field single-hole blasting tests and vibration monitoring. The measured energy proportion of blasting seismic waves under various conditions was then analyzed in detail. A calculation model for seismic energy radiation was developed based on the crack boundary of rock blasting. Using the number of initial free surfaces as a key variable, the influence of blasting source conditions on the blasting seismic energy proportion was further investigated through numerical simulations. The results show that the measured energy proportion of blasting seismic waves in the field tests ranges from 0.83% to 11.70%. Significant variations were observed among different monitoring points, influenced by factors such as distance, propagation path of seismic waves, and blasting source conditions. Adding an additional free surface to the bench blasting with two free surfaces reduced the measured energy proportion of seismic waves by an average of 19.02%. The blasting seismic energy proportion is closely related to the computational boundary and the loading process. By consistently selecting the crack boundary of rock blasting as the computational boundary, the actual proportion of blasting seismic energy radiated outward from the blasting source can be accurately determined. The number of initial free surfaces primarily affects the energy proportion by altering the crack boundary area, with the energy proportion decreasing as the number of free surfaces increases. Under conditions with one, two, and three initial free surfaces, the blasting seismic energy proportions were 9.47%, 7.82%, and 6.36%, respectively.
李勇震1，2，卢文波1，2，王 洋1，2，陈 明1，2，严 鹏1，2. 岩石爆破地震波能量辐射的爆源自由面依赖性研究[J]. 岩石力学与工程学报, 2025, 44(6): 1585-1595.
LI Yongzhen1, 2, LU Wenbo1, 2, WANG Yang1, 2, CHEN Ming1, 2, YAN Peng1, 2. Research of rock blasting seismic energy radiation and its dependence on blasting source and free surfaces. , 2025, 44(6): 1585-1595.
Research of rock blasting seismic energy radiation and its dependence on blasting source and free surfaces
LI Yongzhen1, 2, LU Wenbo1, 2, WANG Yang1, 2, CHEN Ming1, 2, YAN Peng1, 2
(1. State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan, Hubei 430072, China;
2.
Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University,
Wuhan, Hubei 430072, China)
Abstract: To examine the impact of blasting source and free surface conditions on the energy proportion of rock blasting seismic waves, this study conducted two field single-hole blasting tests and vibration monitoring. The measured energy proportion of blasting seismic waves under various conditions was then analyzed in detail. A calculation model for seismic energy radiation was developed based on the crack boundary of rock blasting. Using the number of initial free surfaces as a key variable, the influence of blasting source conditions on the blasting seismic energy proportion was further investigated through numerical simulations. The results show that the measured energy proportion of blasting seismic waves in the field tests ranges from 0.83% to 11.70%. Significant variations were observed among different monitoring points, influenced by factors such as distance, propagation path of seismic waves, and blasting source conditions. Adding an additional free surface to the bench blasting with two free surfaces reduced the measured energy proportion of seismic waves by an average of 19.02%. The blasting seismic energy proportion is closely related to the computational boundary and the loading process. By consistently selecting the crack boundary of rock blasting as the computational boundary, the actual proportion of blasting seismic energy radiated outward from the blasting source can be accurately determined. The number of initial free surfaces primarily affects the energy proportion by altering the crack boundary area, with the energy proportion decreasing as the number of free surfaces increases. Under conditions with one, two, and three initial free surfaces, the blasting seismic energy proportions were 9.47%, 7.82%, and 6.36%, respectively.
Key words: rock mechanics; blasting seismic wave; energy radiation; blasting source dependence; energy proportion; crack boundary; initial free surfaces
2025, Vol. 44 
