Implementing FLAC3D model for simulating deformation mechanism of steel frame support set by actual profile

Purpose. The problem of simulating steel frame irreversible deformation and displacement remains unsolved. The purpose of this research was to develop a new approach to simulation of frame yield support. Methods. We used combination of different methods, namely FLAC3D model, benchmark tests and materialistic frames profile in the form of primitive proxies in place of standard structural elements, for instance, beams, which are actually mathematical lines that have abstract geometrical characteristics of the frame profile. Findings. The research focused on the interaction of steel frame supports and the surrounding rocks during tail entry maintenance behind the longwall face to provide direct flow of air, which reduces methane explosion hazard. Originality. The proposed profile model can be helpful as a practical tool that can assist in frame support improvement during complex interaction of rock massif with frame support in difficult geological and geomechanical conditions. Practical implications. Owing to this approach, we were able to obtain practically all patterns of the actual frame profile behavior: frame turn and displacement, plastic hinge in coffering, longitudinal twisting and splitting, lateral bending, breakage and sliding in yield joints. Surprisingly, frame support behavior in computer model was extraordinary realistic despite primitive approximation of the frame profile, which demonstrates originality of the new approach.