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Study on Influence of Charge Structure on Contour Forming Effect of Hard Rock Tunnel
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Guang-hui ZHANG1, Jia-tuo ZHANG1, Yang WANG2, Yuan-long CHENG1, Hong-jie JANG2, Ming CHEN2
Blasting | 2024, 41(2) : 15 - 22
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Blasting | 2024, 41(2): 15-22
• THEORETICAL AND TECHNOLOGICAL EXPLORATION •
Study on Influence of Charge Structure on Contour Forming Effect of Hard Rock Tunnel
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Guang-hui ZHANG1, Jia-tuo ZHANG1, Yang WANG2, Yuan-long CHENG1, Hong-jie JANG2, Ming CHEN2
Affiliations
  • 1.Luotian Pingyuan Pumped Storage Co., Ltd. of Hubei Energy Group, Huanggang 438000, China
  • 2.School of Water Resources and Hydropower, Wuhan University, Wuhan 430072, China
Published: 2024-06-01 doi: 10.3963/j.issn.1001-487X.2024.02.003
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The contour forming effect of a hard rock tunnel is of significant importance in enhancing the stability of surrounding rock and reducing support costs. This paper aims to optimize the single-hole charge and charge structure for tunnel contour holes. The theoretical range of charge parameters for blasting contour holes in tunnels is proposed initially. Subsequently, blasting tests were conducted on a hard rock tunnel using single-hole charges of 1200 g, 900 g, 750 g, and 600 g respectively, with all tunnel contours analyzed by a laser scanner. Finally, a fracture mechanics model was employed to simulate the contour blasting of the hard rock tunnel with different single-hole charges. The results indicate that when charging parameters are within a reasonable range, smaller single-hole charges result in fewer cracks between blasting holes and less damage to the surrounding rock. Although decreasing the charging amount from 1200 g to 600 g reduces over-excavation volume from 6.53 m3 to 2.02 m3, it also increases under-excavation volume caused by hole position error from 0.15 m3 to 0.26 m3 along the tunnel contour. Furthermore, compared to the damage mechanics model, the fracture mechanics model proves superior in simulating contour blasting for hard rock tunnels as evidenced by good agreement between calculated results and experimental data regarding half hole numbers on the tunnel's contour.

tunnel blasting  /  contour blasting  /  single blast hole charge  /  air decking charge  /  fracture mechanics model
Guang-hui ZHANG, Jia-tuo ZHANG, Yang WANG, Yuan-long CHENG, Hong-jie JANG, Ming CHEN. Study on Influence of Charge Structure on Contour Forming Effect of Hard Rock Tunnel[J]. Blasting, 2024 , 41 (2) : 15 -22 . DOI: 10.3963/j.issn.1001-487X.2024.02.003
Funding
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  • National Natural Science Foundation of China(No51979205)
  • Hubei Province Postdoctoral Innovation Research Post Funding Project(279265)
Appendix
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Year 2024 volume 41 Issue 2
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Article Info
doi: 10.3963/j.issn.1001-487X.2024.02.003
  • Receive Date：2023-07-06
  • Online Date：2026-03-20
  • Published：2024-06-01
Article Data
Affiliations
History
  • Received：2023-07-06
Funding
National Natural Science Foundation of China(No51979205)
Hubei Province Postdoctoral Innovation Research Post Funding Project(279265)
Affiliations
    1.Luotian Pingyuan Pumped Storage Co., Ltd. of Hubei Energy Group, Huanggang 438000, China
    2.School of Water Resources and Hydropower, Wuhan University, Wuhan 430072, China

Corresponding:

WANG Yang (1991-), male, Ph. D, postdoctoral, mainly engaged in rock dynamics simulation research, (E-mail) .
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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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