Spatiotemporal Evolution Characteristics of Stress Transfer in the Stress Concentration Zone at the Working Face End of Steeply Dipping Coal Seams

Zhonghua Xu

doi:10.54097/bdmjbz49

Authors

Zhonghua Xu

DOI:

https://doi.org/10.54097/bdmjbz49

Keywords:

Steeply Dipping Coal Seam, Stress Concentration Zone, Numerical Simulation, Spatiotemporal Evolution of Stress Transfer

Abstract

Steeply dipping coal seams exhibit unique stress environments with spatiotemporal stress transfer in the stress concentration zone of the working face. Revealing these characteristics is crucial for safe and efficient mining. We investigated the spatiotemporal evolution of stress transfer in the stress concentration zone at the junction between the working face and the upper and lower roadways for the steeply dipping fully mechanized coal mining face (35050) of Yiluo Coal Mine. Field measurements and laboratory-determined mechanical properties of rock samples were used to analyze stress transfer paths at the working face end. During the working face advancements, the deformation of the overburden at the junction showed a greater displacement at the upper end than at the lower end. The structural evolution of the surrounding rock along the strike direction exhibited a periodic “stable–deformation–fracture–stable” pattern. Mining-induced stress showed asymmetric dip-ward and symmetric strike-ward transfer and evolution during working face advance. As the face advanced, the extent of the stress boundary line gradually increased. In the coal seam-parallel section, the stress boundary lines of the goaf and roof exhibited asymmetric arch-shaped distributions. The lower-end stress arch was significantly greater than the upper.

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