Mechanism and Application of Roof Cutting by Directional Energy-Cumulative Blasting along Gob-Side Entry

Eryu Wang (), Zhen Shi (), Wenyuan Xi, Jiwei Feng and Pengfei Wu
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Eryu Wang: School of Mining and Coal Engineering, Inner Mongolia University of Science and Technology, Inner Mongolia, Baotou 014010, China
Zhen Shi: School of Mining and Coal Engineering, Inner Mongolia University of Science and Technology, Inner Mongolia, Baotou 014010, China
Wenyuan Xi: School of Mining and Coal Engineering, Inner Mongolia University of Science and Technology, Inner Mongolia, Baotou 014010, China
Jiwei Feng: School of Mining and Coal Engineering, Inner Mongolia University of Science and Technology, Inner Mongolia, Baotou 014010, China
Pengfei Wu: School of Mining and Coal Engineering, Inner Mongolia University of Science and Technology, Inner Mongolia, Baotou 014010, China

Sustainability, 2022, vol. 14, issue 20, 1-21

Abstract: In this paper, roof-cutting technology of directional energy-cumulative presplitting blasting is taken as the research object. Through the numerical simulation software Ansys/Ls-dyna3D, the process of energy-cumulative blasting and non-cumulative blasting is simulated and analyzed by using the ALE algorithm. Moreover, the evolution processes of tensile strain energy, detonation stress wave of explosives, stress state of rock mass, and rock crack damage cumulative are compared in two conditions. In the energy cumulative state, the detonation wave acts centrally on the hole wall in the energy cumulative direction to form an initial crack, and then under the action of the jet of energy cumulative, the crack continues to propagate until it runs through. In the non-energy cumulative state, the crack propagates uniformly around the hole wall, forming irregular short cracks. The simulation is verified by the field test, and the law of crack propagation is the same with the simulation. Therefore, directional energy-concentrated presplitting blasting has good practicability in a roof presplitting operation.

Keywords: roof structure; directional concentrated blasting; roof cutting; ALE algorithm; numerical simulation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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