Abstract: Taking No. 4217 fully mechanized caving face crossing abandoned roadway of Guojiashan Coal Mine (uphill pillar recovery) in Liulin as a case study, a mechanical model of abandoned roadway roof subjected to advance mining influence was established, and support resistance was derived based on interaction relations between roof stability and backfill body in abandoned roadway. The support re-sistance of backfill body in the abandoned roadway is more than 3.58 MPa. The technology of backfilling abandoned roadways with high moisture quick-setting material is put forward：1) High moisture quick-setting backfill material grout can cement both the broken coal/rock and cracks around the aban-doned roadway together into an integral structure, improving the load-bearing capacity of surrounding rock；2) The strength of backfill material (Water cement ratio is 2.5:1) not only meets strength re-quirement of supporting the abandoned roadway roof, but also avoids main roof slide and rotation de-formation. Field test shows that the application of high moisture quick-setting backfill material in abandoned roadway can keep the roof and ribs stability. It provides an effective approach to make the working face pass through an abandoned roadway quickly and safely.

Key words: abandoned roadway, advance mining influence, high moisture quick-setting material, backfill, support resistance of backfill body