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Gold Science and Technology >

2024 , Vol. 32 >Issue 2: 306 - 317

DOI: https://doi.org/10.11872/j.issn.1005-2518.2024.02.008

Mining Technology and Mine Management

Effect of Uncoupled Charge Coefficients on Rock Blast Damage

  • Rui LIANG , 1 ,
  • Xiaorui CAO , 1 ,
  • Wenhai ZHOU 1 ,
  • Xiaoming LOU 2, 3 ,
  • Caizhi HU 4 ,
  • Shujiang WANG 5
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  • 1. School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
  • 2. Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350116, Fujian, China
  • 3. Institute of Explosion Technology, Fuzhou University, Fuzhou 350116, Fujian, China
  • 4. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730099, Gansu, China
  • 5. College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China

Received date: 2023-12-27

  Revised date: 2024-02-29

  Online published: 2024-05-21

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Abstract

A suitable charging structure in blasting engineering can effectively improve the utilization rate of explosives and thus improve the blasting effect.Based on the RHT（Riedel-Hiermaier-Thomamodel）dynamic response mechanics relationship，ANSYS/LS-DYNA software was used to study the effect of the uncoupling coefficient K on the blasting load of rock body under the condition of eccentric uncoupled charge and the damage of rock body during blasting.The effective stress，vibration velocity，seismic wave energy and damage conditions under uncoupling coefficients K=1.0，1.5，2.0，2.5，3.0 and 3.5 were analyzed by establishing a single-hole eccentric uncoupled blasting model.In addition，the relationship between burst center distance l and damage degree D，mass vibration velocity PPV and burst center distance l，and vibration velocity v pp and damage degree D under different conditions of uncoupling coefficients K were investigated.The results show that with the increase of the uncoupling coefficient K，the effective stress and peak vibration velocity of the coupled and uncoupled sides and the peak energy of the seismic wave decreases slightly.The range of the crushed zone and the fracture zone decreases gradually，and the radius of the damage in the crushed zone is larger than the rate of decrease in the fracture zone.The damage degree of rock body and the mass vibration velocity v pp are gradually reduced with the increase in the burst center distance. The greater the particle vibration velocity v pp is，the larger the damage degree is.When v pp reached 50.4 cm/s， the damage variable D in the rock body reached the damage failure threshold of 0.19.When v pp>140.6 cm/s，the damage degree D>0.80.

Key words： rock damage; particle vibration velocity; effective stress; charge structure; blast center distance; uncoupling coefficient

Cite this article

Rui LIANG , Xiaorui CAO , Wenhai ZHOU , Xiaoming LOU , Caizhi HU , Shujiang WANG . Effect of Uncoupled Charge Coefficients on Rock Blast Damage[J]. Gold Science and Technology, 2024 , 32(2) : 306 -317 . DOI: 10.11872/j.issn.1005-2518.2024.02.008

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http://www.goldsci.ac.cn/article/2024/1005-2518/1005-2518-2024-32-2-306.shtml

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