Damage dynamics model of gas-bearing coal under dual disturbances and its application

Abstract

To address the critical gaps in modeling the failure of gas-bearing coal under realistic multi-source disturbances, this study developed, for the first time, a systematically integrated dual-disturbance damage mechanics model. The model uniquely synthesizes a modified Nishihara-NVPB creep framework with partitioned damage evolution laws to concurrently account for gas adsorption, long-term axial static stress, and the synergistic effects of superimposed cyclic and impact dynamic loads. The core innovation is this strategic damage-partitioning integration, where damage from gas and static load is embedded into the elastic element, and damage from dynamic disturbances is embedded into the viscous and plastic elements, enabling a unified representation of complex multi-factor coupling. This integrated constitutive model was successfully embedded into the GDEM continuum-discontinuum software. A full engineering-scale numerical simulation of a coal and gas outburst was conducted. The results, including the excavation outburst initiation distance, in-situ stress evolution at monitoring points, and outburst coal volume, showed high consistency with benchmark results from a large-scale physical simulation test. This work verifies the model’s reliability and applicability at the engineering scale and provides a novel analytical framework and computational tool for investigating the disaster mechanisms of coal and rock dynamic disasters under dual disturbances.

Keywords

Gas-bearing coal / Dual disturbances / Integrated damage mechanics model / Engineering-scale simulation / GDEM

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