A combined “ground support-rock modification-destressing” strategy for 1000-m deep roadways in extreme squeezing ground condition

Deep underground coal mines face great challenges of extreme squeezing conditions resulting from high mining-induced stresses caused by a high recovery of the reserves and low to moderate strength coal measures. This is particularly true for deep roadways that suffer side and front abutment pressure...

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Bibliographic Details
Published in:International journal of rock mechanics and mining sciences (Oxford, England : 1997) England : 1997), 2021-06, Vol.142, p.104746, Article 104746
Main Authors: Kang, Hongpu, Jiang, Pengfei, Wu, Yongzheng, Gao, Fuqiang
Format: Article
Language:English
Subjects:
Coal
Coal mines
Compressing
Deep roadway
Extreme values
Ground control
Grouting
Hydraulic fracturing
Mathematical models
Roads
Rocks
Squeezing ground
Underground mines
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Summary:Deep underground coal mines face great challenges of extreme squeezing conditions resulting from high mining-induced stresses caused by a high recovery of the reserves and low to moderate strength coal measures. This is particularly true for deep roadways that suffer side and front abutment pressures. In this study, a case study was conducted in a 1000-m deep coal mine with extreme squeezing ground conditions. A new strategy of “ground support + rock modification + destressing” was proposed for the ground support. A numerical simulation was performed to evaluate the performance of the new support strategy. Field observations suggested that the proposed strategy could successfully mitigate the extreme squeezing of the double-used entry. The proposed support strategy provides an effective measure for ground control in extreme squeezing conditions.
ISSN:1365-1609
1873-4545
DOI:10.1016/j.ijrmms.2021.104746