Abstract:

In this paper, based on the gob-side entry retaining of large section coal roadway in high gas mine—Tunlan coal mine, it established the rock structure model of the gob-side entry retaining, and analyzed the deformation characteristics of the gob-side entry retaining and the mechanism of action of filler mass beside roadway, as well as proposed the leaving rock control technology of gob-side entry retaining, which included the basic support by using anchor cable combined with steel beams and metal mesh, concrete paste filling material supporting the roadway side, anchor belt net strengthening outer the filler mass, steel mesh strengthening within the filler mass and grouting seal. The site practice results of gob-side entry retaining showed that, maximum of roof separation was 40mm, maximum moving amount between the roof and floor was 17cm, gas concentration at the upper corner of the face was 0.45%~0.75%, gas concentration in the roadway was 0.32%~0.68%, which achieved successful application of gob-side entry retaining of large section coal roadway in high gas mine.

Key words: High gas mine, Coal roadway with large section, Gob-Side Entry Retaining, Paste roadside Packing