Study on the rational position of externally offset mining roadway in the lower split during layered mining of a thick coal seam.

As the offset distance increases, the amount of roof subsidence shows a decreasing trend; the reduction in roof subsidence at an offset distance of 12 m is the greatest compared to that at an offset of 6 m, with a decrease of 42.6%.

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In general, when the external offset distance of the mining roadway is 18 m, the stress on the surrounding rock on the left side of the roadway is the greatest, reaching 11.87 MPa and 8.72 MPa on the right side; When the external offset distance mining roadway is 24 m, the stress on the left side of the roadway begins to decrease, peaking at 11.048 MPa, while stress begins to concentrate on the coal pillar on the right side and shows an increasing trend, peaking at 10.5 MPa.

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