Study on pressure relief mechanism and control technology of single-side double-hole cave-making in gob-side entry of deep buried inclined coal seam

Le résumé fourni par la source

• Proposed a novel " full anchor cable-single-side new double-hole collaborative internal pressure relief " synergistic control technology. • The stress evolution characteristics and pressure relief law under different cavitation parameters are revealed. • Field application confirms that double-hole relief eliminates local stress concentration and enhances roadway stability. To address the severe deformation of gob-side entries in deep inclined coal seams, this study employs an integrated approach combining field monitoring, physical modeling, and numerical simulation using a Ningxia mine as a case study. The research first elucidates the asymmetric failure mechanism driven by the dip angle and deep stress field. Consequently, a novel collaborative control technology " full anchor cable-single side new double hole cooperative internal pressure relief " is proposed. Integrated simulations demonstrate that compared to traditional single-hole methods, the bi-portal strategy more effectively mitigates peak stress and prevents the formation of secondary stress concentrations through a superimposed relief effect. Field industrial tests confirm the technology's efficacy: following implementation, the average surrounding rock deformation decreased from 555 mm to 135.5 mm (a 75.6% reduction), the increase in anchor cable readings was significantly reduced, and the stress levels stabilized in the later stages (with a maximum of 164.2 kN). These results validate the long-term stability of the roadway and provide a robust reference for ground control in similar complex deep geological environments.

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