Abstract: There are obvious strata behaviors in the forepoling segment of No.5105 roadway approaching gob in the working face No.8105 in Tongxin coal mine in Datong mining area. The roadway deformation and single pillar breakage are serious, and the normal use of the roadway is affected seriously too. Based on the analysis of the characteristics of the strong strata appearing in the roadway ap- proaching gob, the main factor of the strong strata has been gained, and simultaneously the method of transferring bidirectional stress of the face roof to reduce the stress concentration in the triangle area of the face end has been proposed. The research shows that: the superposition of the bidirectional bearing pressure in the face end can bring out high stress concentration in the triangle area of the face end, which is the essential influence factor on the strong strata to the roadway forepoling segment; the three-parameter Weibull function in a changed form is adopted to analyze the superposition of the bidirectional support pressure, and the high stress magnitude and stress regional distribution in triangle area of the of face end is gained too; the technical measures of the stress transfer to reduce the stress distribution of the roadway approaching gob has been proposed. Field practice indicates that after using hydraulic fracturing technology to the roof of No.5105 roadway approaching gob and the return air roadway, the forepoling segment pressure of the No.5105 roadway has been significantly improved, and the amount of roadway deformation has been obviously reduced, ensuring the normal production of the coal face.

Key words: triangle area of the face end, roadway approaching gob, roadway strong strata, Weibul l function, stress transfer