Dementalization of Underground Mine Roadway Support Systems Using GFRP Structural Elements
Abstract
This paper addresses the critical issue of high metal intensity and corrosion degradation in underground mine support systems by introducing an alternative non-metallic solution. The research proposes a low-metal-intensity combined dual-level rock bolting system where traditional steel SVP-19 profiles and retaining plates are completely replaced with glass fiber reinforced polymer (GFRP) structural elements. The geomechanical behavior of the system was evaluated across three operational stages-initial state, abutment pressure zone, and behind the longwall face-using 3D finite element numerical modeling in SolidWorks Simulation, applying the Tsai-Hill failure criterion for orthotropic materials. The results demonstrate that the lower stiffness of GFRP elements enables a flexible damping mechanism, reducing peak equivalent stresses within the support by 10% (316 MPa vs. 335 MPa in steel) during the most critical third stage. Furthermore, the composite system improves displacement control by 9%, stabilizing contour deformations at 42 mm. Quadratic polynomial approximations with high determination coefficients R 2 =1.0 were established to predict stress dynamics. The proposed de-metallization strategy reduces the weight of auxiliary support components more than fourfold, significantly improving underground logistics, safety, and operational lifespan in corrosive mine environments.