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| 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) |
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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.
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岩石爆破地震波能量辐射的爆源自由面依赖性研究
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李勇震1，2，卢文波1，2，王 洋1，2，陈 明1，2，严 鹏1，2
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（1. 武汉大学 水资源工程与调度全国重点实验室，湖北 武汉 430072；2. 武汉大学 水工岩石力学教育部重点实验室，湖北 武汉 430072）
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摘要：为研究爆源自由面条件对岩石爆破地震波能量占比的影响，开展现场单孔爆破试验与爆破振动监测，分析不同条件下实测爆破地震波能量占比特性，提出基于开裂边界的岩石爆破地震波能量辐射计算模型，以初始自由面数量为纽带，结合数值模拟方法，进一步研究爆源条件对爆破地震波能量占比的影响规律。结果表明：现场单孔爆破试验中，实测爆破地震波能量占比的范围为0.83%～11.70%，受爆心距、地震波传播路径及爆源条件等因素的影响，各监测点的能量占比实测值存在一定差异；在原有两自由面条件下增加一个初始自由面，实测爆破地震波能量占比平均降低19.02%；爆破地震波能量占比与计算边界及荷载作用过程密切相关，统一选取岩石爆破开裂边界作为计算边界，可获得自爆源激发并向外辐射的爆破地震波能量占比实际值；初始自由面数量通过改变开裂边界面积影响爆破地震波能量占比，随初始自由面数量的增加，能量占比逐渐降低；在1个、2个和3个初始自由面条件下，单孔爆破地震波能量占比分别为9.47%，7.82%和6.36%。
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关键词：岩石力学；爆破地震波；能量辐射；爆源依赖性；能量占比；开裂边界；初始自由面
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中图分类号：TU 45 文献标识码：A 文章编号：1000-6915(2025)06-1585-11
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Research of rock blasting seismic energy radiation and its dependence on blasting source and free surfaces
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LI Yongzhen1, 2, LU Wenbo1, 2, WANG Yang1, 2, CHEN Ming1, 2, YAN Peng1, 2
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(1. State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan, Hubei 430072, China;
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Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University,
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Wuhan, Hubei 430072, China)
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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.
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Key words: rock mechanics; blasting seismic wave; energy radiation; blasting source dependence; energy proportion; crack boundary; initial free surfaces
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2025, Vol. 44 
