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Contour blasting parameters by using a tunnel blast design mode

基于隧道爆破设计模型的光面爆破参数

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Abstract

The quality of contour blasting depends on many initial blasting parameters. The parameters including blasthole diameter, rock Protodyakonov coefficient, tunnel area and distance between cracks on the tunnel face are more important. In this study, an algorithm linking between Delphi programming language and AutoCAD was created to develop a tunnel blasting model. Using this model, tunnel contour blasting passport in AutoCAD can be obtained automatically. The effects of rock Protodyakonov coefficient and cracks’ distance on blastholes number and specific charge with the variation of blasthole diameter and the semi-circular tunnel face area were investigated to yield a set of equations with the highest correlations. The results show that specific charge increases as rock Protodyakonov coefficient, cracks’ distance and drillhole diameter increase, but decreases when tunnel face area increases. In addition, the number of drillholes increases linearly as tunnel face area increases but decreases when drillhole diameter increases.

摘要

光面爆破效果高度依赖炮孔直径、岩石普氏系数、隧道断面和裂隙与隧道轮廓之间的间距等初 始爆破参数。本文提出一种能够实现Delphi 程序语言与AutoCAD 对接的算法, 基于提出的算法开发 了一种隧道爆破设计模型。该隧道爆破设计模型能够实现以AutoCAD 为平台的隧道光面爆破自动设 计。在炮孔直径和隧道断面变化的条件下, 研究了岩石普氏系数和裂隙间距对炮孔数量和单位炸药消 耗量的影响, 给出了一组高度相关方程。研究结果表明, 单位炸药消耗量随着岩石普氏系数、裂隙间 距和炮孔直径的增加而增加, 但是随着隧道断面积的增加而减小。此外, 炮孔数量随着隧道断面积的 增加呈线性增加, 但是随着炮孔直径的增大而减小。

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    Nguyen Ngoc Minh, Ping Cao  (曹平) & Zhi-zhen Liu  (刘智振)

  2. Quang Ninh University of Industry, Quang Ninh, 208650, Vietnam

    Nguyen Ngoc Minh

Authors
  1. Nguyen Ngoc Minh
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  2. Ping Cao  (曹平)
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  3. Zhi-zhen Liu  (刘智振)
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Contributions

CAO Ping provided the concept and edited the paper. Nguyen Ngoc MINH designed the study, conducted the literature review, wrote and edited the paper. LIU Zhi-zhen edited the paper.

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Correspondence to Ping Cao  (曹平).

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Conflict of interest

CAO Ping, Nguyen Ngoc MINH and LIU Zhi-zhen declare that they have no conflict of interest.

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Minh, N.N., Cao, P. & Liu, Zz. Contour blasting parameters by using a tunnel blast design mode. J. Cent. South Univ. 28, 100–111 (2021). https://doi.org/10.1007/s11771-021-4589-x

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  • DOI: https://doi.org/10.1007/s11771-021-4589-x

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