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Asymmetric Deformation and Stability Control of the Roof Plate of a Return Mining Roadway Through a Normal Fault
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Asymmetric Deformation and Stability Control of the Roof Plate of a Return Mining Roadway Through a Normal Fault
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Journal Article
Asymmetric Deformation and Stability Control of the Roof Plate of a Return Mining Roadway Through a Normal Fault
2025
Overview
Fault structures near underground coal mine return roadways frequently influence the deformation of surrounding rock, thereby constraining roadway stability. However, when the roof deformation is not clear in the case of a roadway through a normal fault, it will directly affect the establishment of a reasonable control program for the roof. Based on elastic-plasticity theory, this paper proposes a method for calculating the maximum deformation position of the roof plate in a roadway through a normal fault. This method accurately determines the maximum deformation position while considering the variation in widths between the upper and lower roof plates. Numerical simulations revealed the dual characteristics of asymmetric deformation in the roof plate and the asymmetric morphology of the plastic zone during the mining period. Furthermore, it delineated the significant impact of the width of the roof plate of the lower disc on roof deformation. A statistical analysis was conducted on the standard deviation (S) and coefficient of variation (CV) of both the theoretical and numerical simulation results, as well as the error rate between them. The analysis responded well to the reliability of the study results. The proposed reinforcement support program effectively guided the stability control of the roof plate in the roadway through the normal fault at the site. The research findings provide valuable insights for predicting and controlling roof deformation in roadways and tunnels under similar engineering conditions.HighlightsA theoretical calculation method of the maximum deformation location of the roof plate of the roadway through a normal fault is proposed.The asymmetric deformation characteristic of the roof plate of the roadway through the normal fault is revealed.Significant sensitivities of the surface deformation of the roof plate and the area of the plastic zone to the width of the roof plate of the lower disk are obtained.The feasibility of the theoretical predictive analysis of the location of maximum roof deformation in a roadway through a normal fault is determined.
