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Gold Science and Technology >

2023 , Vol. 31 >Issue 2: 331 - 339

DOI: https://doi.org/10.11872/j.issn.1005-2518.2023.02.091

Mining Technology and Mine Management

Determination of Blasting Parameters for Excavation and Cutting of Small Section Roadways Based on Orthogonal Experiments

  • Yifeng ZHANG , 1 ,
  • Hongchao LI , 1, 2 ,
  • Zhiyu ZHANG 3 ,
  • Heng LI 1
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  • 1. Faculty of Public Security and Emergency Management, Kunming University of Science and Technology, Kun -ming 650093, Yunnan, China
  • 2. City College, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
  • 3. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

Received date: 2022-07-13

  Revised date: 2022-10-28

  Online published: 2023-04-27

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Highlights

In order to improve the utilization rate of blastholes in small section tunnels in a tin mine in Yunnan Province and reduce the unit consumption of explosives，after analysis，it is determined that the four factors of the charge amount，the distance between the charge hole and the empty hole，the hole diameter and the filling length are the test factors.The blast hole utilization rate and the cavity volume are the test indicators，and each factor takes 3 levels.Using the method of repeated orthogonal experiments，the effects of four different factors，namely，the charge amount，the distance between the charge hole and the empty hole，the hole diameter and the packing length，on the blasting hole utilization rate and the cavity volume were studied through the range analysis and variance analysis.The significance of the influence of each test index determine the optimal com-bination of test factors.The research results show that in the range analysis，the distance between the charge hole and the empty hole has the greatest influence on the utilization rate of the undercut blasting hole，followed by the hole diameter，the charge amount is smaller，and the filling length has the least influence. The hole diameter has the largest impact on the groove volume，the distance between the charging hole and the empty hole is second，the packing length is smaller，and the charging amount has the smallest influence.In the variance analysis，the distance between the charge hole and the empty hole has a very significant effect on the blast hole utilization rate，the hole diameter has a significant effect on the blast hole utilization rate，and the charge amount and packing length have no significant effect on the blast hole utilization rate.The hole diameter has a very significant influence on the volume of the cavity，the distance between the charging hole and the empty hole has a significant effect on the volume of the cavity，and the significant effect of the packing length on the volume of the cavity is slightly weaker than the distance between the charging hole and the empty hole.The amount has the least significant effect on the cavity volume.Therefore，for small section roadway excavation，when the hole diameter is 70 mm，the distance between the charge hole and the empty hole is 10 cm，the charge amount is 3 kg，and the mud filling length is 20 cm，the undercut can achieve excellent blasting effect.After several on-site roadway excavation tests，the blasthole utilization rate can be increased from 80% to more than 93%.

Cite this article

Yifeng ZHANG , Hongchao LI , Zhiyu ZHANG , Heng LI . Determination of Blasting Parameters for Excavation and Cutting of Small Section Roadways Based on Orthogonal Experiments[J]. Gold Science and Technology, 2023 , 31(2) : 331 -339 . DOI: 10.11872/j.issn.1005-2518.2023.02.091

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http://www.goldsci.ac.cn/article/2023/1005-2518/1005-2518-2023-31-2-331.shtml

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