The Mechanism of Plugging Open-Pit Mine Cannon Holes and the Modification of Plugging Materials

Xiaohua Ding, Zhongchen Ao (), Xiaoshuang Li, Shuangshuang Xiao, Mao Wu, Bokang Xing, Ruhao Ge and Donghua Zhang
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Xiaohua Ding: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Zhongchen Ao: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Xiaoshuang Li: School of Civil Engineering, Shaoxing University of Arts and Sciences, Shaoxing 312010, China
Shuangshuang Xiao: School of Energy, Xi’an University of Science and Technology, Xi’an 710064, China
Mao Wu: China Coal Pingshuo Group Co., Ltd., Shuozhou 036006, China
Bokang Xing: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Ruhao Ge: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Donghua Zhang: School of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Sustainability, 2023, vol. 15, issue 5, 1-25

Abstract: Step blasting is an important part of open-pit mining, which is accompanied by hazards such as large blasting blocks, flying stone splashing, blasting noises, and blasting dust during the blasting process. In order to reduce the harm caused by blasting, this paper uses impact dynamics and rock dynamics to explain the deformation damage and motion law caused by detonation of the material blocked by the gun hole. By simulating the motion of the blocked material in the gun hole, the motion and failure characteristics of the blocked material in the gun hole are revealed. In this paper, geological polymer is introduced into the field of open-pit mine blasting, and 700 g rock powder, 200 g slag, 40 g NaOH solution (30%), and 140 g water glass with a modulus of 3.2 and 80 g of water are selected to prepare geological polymer-modified plugging materials to change rock powder blockage from bulk to solid, and improve the plugging performance. Finally, a field test was carried out in the open-pit mine explosion area, and a comparative test was carried out through the high-speed photography system; it is demonstrated that the modified blocking material could improve the blockage ability of the gun hole, reduce the large block rate of the upper part of the step, reduce the amount of dust, reduce the amount of flying stone, and improve the production efficiency and safety.

Keywords: open-pit mines; blow up; gun holes; geopolymers; clog the material (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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