Abstract: Ores from Baoshenmiao mine in Wafangzi Manganese Mine are in small size and usually explored by small mines.The mine was taken over since 2007， and recovered with the regular wall backfill method from Jiupingpan.In the mining process， the developing tunnel suffers serious ground pressure， resulting in floor heave in horizontal transport， two-side extruding and roof subsidence.Huge maintenance workload exists.Although a variety of support measures such as bolting， metal scaffolding are adopted， collapse at the transport tunnel and roof fall at the connection roadway happened yet before the recovery was finished. Through on-site observation and analysis on the mechanical properties of the ore， the occurrence and growing process of ground pressure in roadway were identified， and the behavior law of ground pressure and its damage mechanism were analyzed.Two main forms in roadway damage were summarized， that is， the rib fall-floor heave-roof subsidence and the continuous roof caving.According to different damaging form of ground pressure， the roadway support consisting of roof and floor elliptical arch sections associated with the whole cross-section of spraying and anchoring net was proposed.Then， new type of supporting technique was formed， which better fitted with the rocks and realized good effect.

Key words: Manganese mine, Floor heave, Anchor bolt support, Rule of geostatic activity