Application of 3DEC Numerical Simulation Method in Experimental Teaching of Mine Safety Engineering

Ruifeng Huang

doi:10.6918/IJOSSER.202608_9(8).0008

Authors

Ruifeng Huang School of Emergency Technology and Command, University of EmergencyManagement, YanJiao 065201, China

DOI:

https://doi.org/10.6918/IJOSSER.202608_9(8).0008

Keywords:

Mine safety engineering; N00 mining method; experimental teaching; principal stress evolution; 3DEC numerical simulation.

Abstract

An in-depth understanding of mining models, the mining-induced evolution characteristics of three-dimensional principal stresses, as well as stress states and instability failure modes, is critical for students to grasp the disaster-causing mechanisms of roof disasters, gas disasters, water inrush disasters and other hazards in mine safety engineering. Compared with the traditional mechanical analytical method, field in-situ stress test data analysis method and triaxial compression test method, the 3DEC numerical simulation method can characterize the stress distribution and failure morphology during mining more accurately. It possesses advantages such as high consistency with engineering practice, strong teaching visualization and low experimental cost. Taking the N00 mining method for longwall mining as the research object, this study adopts a teaching approach combining theoretical analysis and 3DEC numerical simulation to systematically reveal the mechanical response characteristics of rock masses at key positions under this mining method. The results show that: (1) In view of the mechanical property that rock masses resist compression but are vulnerable to tension, the directional hydraulic roof cutting technology can realize hydraulic fracture generation with low disturbance. (2) Under the combined effect of cutting fractures and mining disturbance, the three-dimensional principal stresses of immediate roof rock blocks on the goaf side present a dynamic evolution characteristic of “increase–decrease–increase”, accompanied by obvious deflection of mining-induced principal stress directions. (3) The mining-induced failure mode of roof rock blocks on both sides of the goaf is tension-shear composite failure, while that in the central area is shear failure. Teaching practice demonstrates that introducing the 3DEC numerical simulation method into the experimental teaching of mine safety engineering is highly feasible. This method enriches teaching approaches and provides effective research methods and implementation paths for students to understand the mechanisms of engineering disasters.

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