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<p>Aiming to address the formidable engineering challenges associated with significant construction-induced disturbances and the intricate task of maintaining stability during the excavation of large cross-sectional deep underground chambers, rigorous monitoring and analytical investigations were conducted into the deformation and deterioration processes of the pump house group in Wanfu Coal Mine, known for housing the most extensive alluvial layer in the world. The results revealed that under the influence of construction disturbance in deep chamber groups, the deformation of surrounding rock continues to increase, the range of loosening and breaking exceeds the anchoring depth of bolt/cable, the stress of bolt (cable) increases first and then becomes stable, and the lining fails due to excessive load. Numerical experimental studies were systematically carried out under different ground stresses, surrounding rock strengths, and support preload forces to define a control mechanism for high prestress anchoring in deep chamber groups. On this basis, a reinforcement scheme for the pump room group in Wanfu Coal Mine was developed. Field monitoring demonstrated that maximum deformation of surrounding rock reached only 7.3&#xa0;mm, achieving stable control over deep large-section chamber groups.</p>

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Study on Disturbance Failure Mechanism and High Preload Bolt-Grouting Control Method of Deep Large-Section Chamber Group

  • 期刊论文

  • 发表日期：

    2025年3月24日

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  • Ning Yang,
  • Yubing Huang,
  • Yukun Ma

摘要

Aiming to address the formidable engineering challenges associated with significant construction-induced disturbances and the intricate task of maintaining stability during the excavation of large cross-sectional deep underground chambers, rigorous monitoring and analytical investigations were conducted into the deformation and deterioration processes of the pump house group in Wanfu Coal Mine, known for housing the most extensive alluvial layer in the world. The results revealed that under the influence of construction disturbance in deep chamber groups, the deformation of surrounding rock continues to increase, the range of loosening and breaking exceeds the anchoring depth of bolt/cable, the stress of bolt (cable) increases first and then becomes stable, and the lining fails due to excessive load. Numerical experimental studies were systematically carried out under different ground stresses, surrounding rock strengths, and support preload forces to define a control mechanism for high prestress anchoring in deep chamber groups. On this basis, a reinforcement scheme for the pump room group in Wanfu Coal Mine was developed. Field monitoring demonstrated that maximum deformation of surrounding rock reached only 7.3 mm, achieving stable control over deep large-section chamber groups.