• BLASTING
  • Vol. 39, Issue 3, 76 (2022)
WANG Wei1, HUAI Ping-sheng2, and JIANG Shi-liang1
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
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    DOI: 10.3963/j.issn.1001-487x.2022.03.011 Cite this Article
    WANG Wei, HUAI Ping-sheng, JIANG Shi-liang. Efficient Driving Method for Large Section Tunnel by Burn Cut Blasting with Uncharged Holes[J]. BLASTING, 2022, 39(3): 76 Copy Citation Text show less

    Abstract

    Burn cut blasting with uncharged holes was adopted in a large-section tunnel project of Etihad Railway in the United Arab Emirates to ensure timely completion of the construction with a high standard.Engineering mathematical models are established to determine blasting parameters and guide the construction process.Considering the bit diameter on site,two burn cut plans with four 102 mm-diameter uncharged holes and six 64 mm-diameter uncharged holes are presented by using mathematical models.The theoretical excavation footage for each of the two plans is 4.5 m and 4 m,respectively.As a contrast,a wedge cut scheme is designed with a theoretical footage of 4m.According to the field test statistics of T7 tunnel,the average footage per cycle of the 4-uncharged-hole plan is 4.3 m with a hole efficiency of 95.6%,which is 0.6 m more than the footage of wedge cut plan.According to the field test statistics of T10 tunnel,the average footage per cycle of the 6-uncharged-hole plan is 3.8 m with a hole efficiency of 95.0%.Compared to the wedge cut plan,the maximum charge per delay has decreased by 85%,which has controlled the PPV below the allowed value indicated by the monitoring data.Numerous applications of burn cut with uncharged holes in this project have validated the effectiveness of the engineering mathematical model in medium-hard and hard rocks.At the same time,the burn cut plan can speed the construction process,reduce blast costs,and effectively control blast vibrations.
    WANG Wei, HUAI Ping-sheng, JIANG Shi-liang. Efficient Driving Method for Large Section Tunnel by Burn Cut Blasting with Uncharged Holes[J]. BLASTING, 2022, 39(3): 76
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