Distribution law of principal stress difference and stability of roadway surrounding rock in unequal stress field

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[1]	. Concentrated stress transfer mechanism of coal pillars in shallow-buried closely spaced multi-seam mining [J]. Journal of Mining and Safety Engineering, 2021, 38(6): 1071-1080.
[2]	. Study on stress seepage coupling model and numerical simulation of fractured rock mass [J]. Journal of Mining and Safety Engineering, 2021, 38(6): 1220-1230.

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