Mechanical characteristics and partition control technology in whole life cycle of deep gob-side entry: A case study

In deep mining engineering, high-stress roadways frequently experience severe damage, thereby compromising the stability of the surrounding rock. This study investigates the stress-energy evolution in the 31,402 material roadway in Hongqinghe Coal Mine through numerical simulation and field measurement. The study focuses on three critical stages of its whole life cycle: facing the excavation roadway, gob-side entry driving, and mining of the working face. The mechanical behavior of each stage shows significant differences. The results show that while facing the excavation roadway, the primary areas of stress concentration and energy dissipation were observed to be approximately 4 m from the goaf driving heading. As the gob-side entry progresses, the stress distribution within the coal pillar transitions to a bimodal pattern, with most energy dissipation occurring on the gob side. When mining the 31,402 working face, the stress distribution across the coal pillar approaches equilibrium, and the energy dissipation pattern evolves into a bimodal form. A partition control strategy for different stages of roadway surrounding rock is proposed, and the support parameters are determined. Engineering practice demonstrates that this technology can effectively control the deformation of the surrounding rock in roadways.