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Smooth Blasting Technology for Tunnel Inverted Arch and its Engineering Application
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Xiang-ping LI1, Wei-yi GONG1, Zhen ZHANG2
Blasting | 2023, 40(2) : 69 - 74
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Blasting | 2023, 40(2): 69-74
• BLASTING IN ORE AND ROCK •
Smooth Blasting Technology for Tunnel Inverted Arch and its Engineering Application
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Xiang-ping LI1, Wei-yi GONG1, Zhen ZHANG2
Affiliations
  • 1.The 1st Engineering Co., Ltd. of China Railway 12th Bureau Group, Xi'an 710038, China
  • 2.State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, China
Published: 2023-06-01 doi: 10.3963/j.issn.1001-487X.2023.02.010
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The dislocation and overbreak of tunnel inverted arch are serious when traditional blasting excavation technology is used. This is because traditional blasting technology does not adopt the smooth blasting method, and the angle of the perimeter holes is too large when drilled by manual rock drilling rigs. By therefore analyzing the traditional blasting excavation technique of invert, the cause of serious studiedthe smooth blasting technology for inverted arch is proposed based on the smooth blasting theory and a large quantity of engineering practice. Water decking charge structure is adopted in the perimeter holes, which can be adjusted according to the inverted arch shape. The spacing between the perimeter holes is 30~50 cm, and the thickness of the smooth blasting layer is greater than the perimeter hole spacing by 10~30 cm. Additionally, a drilling counterforce support is used to reduce the angle of the perimeter holes which can ensure each blast hole to be drilled to the design depth. After comparing the blasting effects of the proposed smooth blasting technology and traditional blasting technology for the inverted arch by field tests, the contour overbreak by the smooth blasting technology is far less than that of traditional blasting technology, and the cost of every 12 m tunnel excavation is reduced by 35.14%.

tunnel inverted arch  /  traditional blasting excavation technology  /  smooth blasting technology  /  overbreak  /  blasting effect
Xiang-ping LI, Wei-yi GONG, Zhen ZHANG. Smooth Blasting Technology for Tunnel Inverted Arch and its Engineering Application[J]. Blasting, 2023 , 40 (2) : 69 -74 . DOI: 10.3963/j.issn.1001-487X.2023.02.010
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Year 2023 volume 40 Issue 2
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Article Info
doi: 10.3963/j.issn.1001-487X.2023.02.010
  • Receive Date：2023-01-23
  • Online Date：2026-03-18
  • Published：2023-06-01
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  • Received：2023-01-23
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Affiliations
    1.The 1st Engineering Co., Ltd. of China Railway 12th Bureau Group, Xi'an 710038, China
    2.State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, 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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