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Coal Engineering ›› 2026, Vol. 58 ›› Issue (2): 8-15.doi: 10.11799/ce202602002

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Optimization of terminal mining position and stress control technology for roadway protection in fully mechanized mining faces 

  

  • Received:2025-07-15 Revised:2025-09-24 Online:2026-02-15 Published:2026-03-16

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Abstract:

Cantilever beam structure is a type of overlying strata structure commonly found in comprehensive mining working face, which often results in higher stress concentrations in the coal pillar near the mining stop line. The failure of coal pillar leads to the transfer of front abutment pressure to the main roadway, thereby increasing the risk of destabilization of the surrounding rocks in the main roadway. Taking the 22104 working face of the Yaping Coal Mine as the engineering background, this paper first analyzes the transfer process of front abutment pressure influenced by the cantilever beam structure based on key stratum theory. Subsequently, the deformation and failure processes of the surrounding rock in the main roadway under the gradual influence of mining were simulated using FLAC3D, which reduces the width of the coal pillar to about 55m. In order to provide sufficient safety redundancy for the main roadway, a combined reinforcement technology consisting of “excavating another pressure relief roadway and pre-grouting reinforcement on both sides” is proposed, which simultaneously realizes the pressure relief by the roadway and the pressure control by the reinforcement of the coal and rock, so as to improve the stress environment of the main roadway. The deformation and failure of the main roadway under the two programs of “pressure relief” and “pressure relief-pre grouting” were simulated, and the results showed that the reinforcement technology can effectively reduce the risk of failure of surrounding rocks in the main roadway. The program was applied in the field, and the main roadway could still maintain its own stability after 3 months of mining stoppage, which provided a guarantee for the safe mining of the mine.

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