Application of Air Interval Charge Blasting Model in Mining Room

Rui LIANG; Ruili YU; Wenhai ZHOU; Xiaobin HUANG; Jianyong WANG; Zhengyu XIONG

doi:10.11872/j.issn.1005-2518.2019.03.358

Gold Science and Technology >

2019 , Vol. 27 >Issue 3: 358 - 367

DOI: https://doi.org/10.11872/j.issn.1005-2518.2019.03.358

Mining Technology and Mine Management

Application of Air Interval Charge Blasting Model in Mining Room

Rui LIANG ^,¹ ,
Ruili YU ^,¹ ,
Wenhai ZHOU ¹ ,
Xiaobin HUANG ² ,
Jianyong WANG ³ ,
Zhengyu XIONG ³

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1. School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, Gansu，China
2. Institute of Explosion Technology, Fuzhou University, Fuzhou 350116, Fujian，China
3. Zijin Mining Construction Co. , Ltd. , Longyan 364200, Fujian，China

Received date: 2018-06-16

Revised date: 2018-11-22

Online published: 2019-07-09

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Highlights

Aiming at the problems of excessive blasting vibration and impact，high bulk rate，large vibration and blasting hazard effects in the process of deep hole lateral collapse blasting in underground mining，ANSYS/LS-DYNA software based on ALE algorithm is adopted in this paper.The program established a numerical model for the blasting of air-deck charge structures with four different air column lengths and different charge amounts.Firstly，using the initial impact pressure theory analysis，theoretically deducing the stress at different distances from the charging section，the stress peak is increased at the charging section，reduced at the air section，and the stress distribution in the middle of the air section is superimposed and analyzed.Then，using ANSYS/LS-DYNA software，the explosion stress field in the rock mass and the free surface of the collapse is numerically simulated when the charge structure is blasted.It shows that when the charge is the same within a certain engineering range,the effective stress decreases with the increase of the length of the air column.When the length of the air column is the same，the larger the charge is，the larger the effective stress is.The peak value of the stress appears to be the largest at the charging section，and it is reduced at the air section.The law of minimum stress in the middle is basically consistent with the theoretical analysis.By analyzing the effective stress peaks of the four air-deck charge models，it is obtained that within a certain engineering range，the effective stress decreases with the increase of the length of the air column in the case of the same charge.When the air column length is the same，the larger the charge，the greater the effective stress.The longer the length of the air column，the longer the length of the air column，the more stable the effective stress distribution，and the more uniform the explosion energy distribution.By extracting the effective stress peaks of the key elements on the free surface of each scheme，the effective stress peak curve was drawn，and the Von Mises yield criterion is used to judge whether the rock is damaged，and the vibration response speed of the particle on the free surface of the collapse is reflected.The effective peak of the unit on the surface and the peak of the unit synthesis speed was compared to select the best air-deck charge structure.

Cite this article

Rui LIANG , Ruili YU , Wenhai ZHOU , Xiaobin HUANG , Jianyong WANG , Zhengyu XIONG . Application of Air Interval Charge Blasting Model in Mining Room[J]. Gold Science and Technology, 2019 , 27(3) : 358 -367 . DOI: 10.11872/j.issn.1005-2518.2019.03.358

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