Stability of rock burst prevention in narrow coal pillar roadway based on FLAC3D

Abstract

With the progress of coal extraction into deep strata, the scour-resistant stability of slender coal pillar drifts has become a key factor limiting safe and efficient development. Conventional pillar design relies on static load assumptions and fails to consider the effect of dynamic loads in excavations on stress accumulation, resulting in excessive conservatism and huge waste of resources. Based on the FLAC3D (Fast Lagrangian Analysis of Continua in 3D) computational simulation platform, the stress distribution characteristics, plastic zone evolution behavior, and energy accumulation mechanism of slender coal pillar drifts were analyzed through three-dimensional geomechanical modeling. This research clarified the characteristics of the stress concentration phenomenon in pillars of different dimensions and studied the dynamic stability response of the pillar during excavation. It has been revealed that the 200 m pillar width designed by FLAC3D solidifies the coal reserves of about 20% compared to the 250 m pillar design by the traditional approach under the same safety requirements. This research provides a theoretical basis and technical support for scour-resistant design of slender coal pillar drifts and is of great significance for the development of coal mining toward precision and intelligence.