Distribution Characteristics of the Overburden Three-Zone Structure in the Goaf of a Y-Type Ventilation Working Face

RenRui Li; YuTing Kong

doi:10.63313/AERpc.9079

Authors

RenRui Li School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454003, China Author
YuTing Kong School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454003, China Author

DOI:

https://doi.org/10.63313/AERpc.9079

Keywords:

Y-Type Ventilation, Goaf, Overburden Three-Zone Structure, Fracture Evolution, Numerical Simulation, Gas Control

Abstract

To elucidate the development law of the overburden three-zone structure in the goaf of a Y-type ventilation working face, the 32010 working face of a coal mine was selected as the engineering background, and the evolutionary characteristics of the overburden three zones were investigated by combining theoretical analysis with numerical simulation. First, the formation mechanism of the overburden three-zone structure was analyzed. Second, empirical formulae were employed to estimate the heights of the caving zone and fractured zone. Finally, a UDEC numerical model was established to simulate the evolution of overburden fractures during face advance. The results indicate that the theoretical calculation gives a caving-zone height of 10.24-14.45 m and a fractured-zone height of 37.86-51.04 m. The numerical simulation shows that when the working face advances to 80 m, the caving-zone height is approximately 14 m and the fractured-zone height is approximately 55 m. The theoretical and numerical results are in good agreement, indicating that the proposed model can effectively capture the development law of the overburden three-zone structure in the goaf of a Y-type ventilation working face.

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