Feasibility of GFRP Bolts for Stope Roadway Support in Cemented Backfill Drift Mining: A Case Study of Jinchuan No. 2 Mine

Abstract

Conventional rebar bolts used for stope roadway support during cemented backfill drift mining often suffer from high installation demand, high cost, and corrosion damage. Based on Jinchuan No. 2 Mine, this study combined field anchorage force tests, numerical analysis, and field trials to evaluate the feasibility of Glass-fiber-reinforced plastic (GFRP) bolts for stope roadway support. Under full length anchorage, the average anchorage force of GFRP bolts reached 103.53 kN. This was 74.65% of the value for rebar bolts and was sufficient to meet the support requirement of the mining area. The anchorage forces of both GFRP bolts and rebar bolts decreased as anchorage length decreased, but GFRP bolts were more sensitive to anchorage length. Under the same support parameters, GFRP bolt support reduced the stress concentration range, deformation, and plastic zone volume of the surrounding rock. Its overall control effect was close to that of rebar bolt support. During the field trial, the test roadway remained stable. These results indicate that GFRP bolts can serve as a feasible support option for stope roadways in cemented backfill drift mining.