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Determining the reasonable pillar width and surrounding rock control based on goaf compaction

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Abstract

The stress distribution and deformation of roadway surrounding rock at different pillar widths are investigated through theoretical calculation, numerical simulation and field monitoring, taking into account goaf compaction. The purpose is to determine the best width and the stress evolution of the reserved roadway protective coal pillar in fully mechanized working faces. The results show that when the gangue in the goaf is slowly compacted, its stress will recover and the gangue will take over part of the overburden load. This will result in a reduction in the bearing pressure inside the surrounding rock. The stress recovery of the fallen gangue in the goaf center will peak and diffuse to the goaf edge in a decreasing manner. As the pillar width increases, the concentrated stress of the pillar will change from unimodal to bimodal. The bearing capacity will gradually increase. The peak stress and plastic failure area of the roadway solid coal wall will gradually reduce. Taking into account pillar stability, resource recovery and the need to prevent gas in the goaf from coming into the mining roadway, we recommend setting the pillar width in coal 3#, the protective layer, to 10 m. The mine replaced the original bolt-cable roof support scheme with a full-cable plus local grouting technique. Field practice indicates a displacement of 39, 20, 32, and 23 mm for the roadway roof, floor, pillar wall, and solid coal wall. The overall roadway deformation is well controlled, validating our numerical simulation result.

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Acknowledgements

The study was funded by the National Natural Science Foundation of China (Nos. 51804182 )

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  1. College of Resources, Shandong University of Science and Technology, Tai’an, 271000, China

    Pengqiang Zheng & Yanqing Liu

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  1. Pengqiang Zheng
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  2. Yanqing Liu
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Correspondence to Yanqing Liu.

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Zheng, P., Liu, Y. Determining the reasonable pillar width and surrounding rock control based on goaf compaction. Geotech Geol Eng 41, 43–55 (2023). https://doi.org/10.1007/s10706-022-02261-z

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