Mechanism and Control Technology of Lateral Load-Bearing Behavior of a Support System Adjacent to Empty Roadways

Yongjia Jing; Ying Xu; Jianbiao Bai; Yanhui Li; Jinliang Li

Mechanism and Control Technology of Lateral Load-Bearing Behavior of a Support System Adjacent to Empty Roadways

2025

Yongjia Jing | Ying Xu | Jianbiao Bai | Yanhui Li | Jinliang Li

Currently, research on the stability of roadway-side supports in gob-side entry techniques primarily focuses on vertical stress, neglecting the lateral effects induced via roof collapse and waste rock compaction in the mined-out area. This paper systematically investigates the effect of roof rotation and the compression of waste gangue on the lateral load-bearing behavior of the roadway-side support system, combining theoretical analysis with FLAC3D numerical simulations. The results indicate that the lateral load-bearing capacity of the support system is positively correlated with both mining height and the width of the roadway-side support. When the mining height or the support width is small, the lateral load-bearing capacity of the support system is weaker, making it more prone to sliding failure. Furthermore, lateral load control technology for the roadway-side support system is proposed, which includes “roof cutting + increasing width”. When the stress transfer path of the roof is blocked, as the support system width increases from 1 m to 2 m, the lateral load-bearing capacity of the roadway-side support significantly increases and then stabilizes. This results in different extents of expansion in the elastic region within the support system, providing valuable insights for the design of roadway-side supports.

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