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Rock Fragmentation Patterns in Tunnels with Interbedded Surrounding Rock by Blasting with Slotted Blastholes
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Chengyu XIONG1, Jian ZHANG2, Xiangyang LIU1, Xuefu ZHANG3, Yaomin HUANG1, Bo HU2, Biao YU1, Gaoyu LIN2
Mining and Metallurgical Engineering | 2024, 44(6) : 11 - 15
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Mining and Metallurgical Engineering | 2024, 44(6): 11-15
• MINING •
Rock Fragmentation Patterns in Tunnels with Interbedded Surrounding Rock by Blasting with Slotted Blastholes
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Chengyu XIONG1, Jian ZHANG2, Xiangyang LIU1, Xuefu ZHANG3, Yaomin HUANG1, Bo HU2, Biao YU1, Gaoyu LIN2
Affiliations
  • 1.The Fourth Engineering Co., Ltd. of CCCC First Highway Engineering Co., Ltd., Nanning 530000, Guangxi, China
  • 2.School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
  • 3.Institute of Future Civil Engineering Science and Technology, Chongqing Jiaotong University, Chongqing 400074, China
Published: 2024-12-01 doi: 10.3969/j.issn.0253-6099.2024.06.003
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According to the relative position between interbedded surrounding rock and the peripheral holes, the relationship between bedding planes and the connecting line of the adjacent blastholes was classified into three kinds. Mechanism for bedding planes bringing impact to crack propagation in rocks between blastholes by blasting under typical work conditions (with bedding planes on the perpendicular bisector of the connecting line of blastholes) was explored by the LS-DYNA numerical simulation; and the effect of bedding planes in a different relative position to the connecting line of blastholes on the blasting effect of surrounding rock was also studied. It is found that the propagation speed of blasting vibration waves in sandstone is slightly higher than that in sandy mudstone. Under blasting loads, the surrounding rock above both softer layer and the beddings suffer severe damage. The superposition of two-blasthole blasting vibration wave peaks intensifies the damage to the surrounding rock. The blasting effect is poor when the bedding plane penetrates the blastholes, but the blasting effect is ideal if the bedding plane is on the perpendicular bisector of the connecting line of blastholes.

tunnel blasting  /  interbedded surrounding rock  /  blasting with slotted blasthole  /  crack propagation  /  bedding plane  /  peripheral hole  /  blasting vibration  /  surrounding rock damage
Chengyu XIONG, Jian ZHANG, Xiangyang LIU, Xuefu ZHANG, Yaomin HUANG, Bo HU, Biao YU, Gaoyu LIN. Rock Fragmentation Patterns in Tunnels with Interbedded Surrounding Rock by Blasting with Slotted Blastholes[J]. Mining and Metallurgical Engineering, 2024 , 44 (6) : 11 -15 . DOI: 10.3969/j.issn.0253-6099.2024.06.003
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Year 2024 volume 44 Issue 6
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Article Info
doi: 10.3969/j.issn.0253-6099.2024.06.003
  • Receive Date：2024-06-08
  • Online Date：2026-03-19
  • Published：2024-12-01
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  • Received：2024-06-08
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Affiliations
    1.The Fourth Engineering Co., Ltd. of CCCC First Highway Engineering Co., Ltd., Nanning 530000, Guangxi, China
    2.School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
    3.Institute of Future Civil Engineering Science and Technology, Chongqing Jiaotong University, Chongqing 400074, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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