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<p>Interface shear instability of the coal–backfilling composite structure is a primary cause of engineering disasters, and carbon fiber reinforced polymer (CFRP) can address this issue. In this study, shear tests were conducted on coal–backfilling composite structure with different interface angles both before and after CFRP wrapping. The effects of CFRP wrapping on the macroscopic failure characteristics of specimens, such as shear strength and acoustic emission-surface strain characteristics, were analyzed. A detailed continuum-discontinuity coupling model of specimens (both before and after CFRP wrapping) was established. The effects of CFRP wrapping on the microscopic failure characteristics of specimens, such as damage process and strong force chain distribution, were investigated. On this basis, a peak shear strength model for coal–backfilling composite structure was established, and the shear damage mechanism was analyzed. The results show that CFRP wrapping can enhance the peak shear strength and interface stability of coal–backfilling composite structure. After CFRP wrapping, coal–backfilling composite structure can undergo more crack initiation and propagation. The interior of CFRP-wrapped specimen can withstand greater loads. After CFRP wrapping, the internal friction angle of specimen increases, further enhancing its shear strength.</p>

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Strengthening Effect of CFRP on Variable-angle Shear Behavior of Coal–backfill Composite Structures: Insights on Simulations and Experiments

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Jinwen Bai,
  • Jiawei Wang,
  • Xudong Shi,
  • Guorui Feng,
  • Shanyong Wang,
  • Kai Wang

摘要

Interface shear instability of the coal–backfilling composite structure is a primary cause of engineering disasters, and carbon fiber reinforced polymer (CFRP) can address this issue. In this study, shear tests were conducted on coal–backfilling composite structure with different interface angles both before and after CFRP wrapping. The effects of CFRP wrapping on the macroscopic failure characteristics of specimens, such as shear strength and acoustic emission-surface strain characteristics, were analyzed. A detailed continuum-discontinuity coupling model of specimens (both before and after CFRP wrapping) was established. The effects of CFRP wrapping on the microscopic failure characteristics of specimens, such as damage process and strong force chain distribution, were investigated. On this basis, a peak shear strength model for coal–backfilling composite structure was established, and the shear damage mechanism was analyzed. The results show that CFRP wrapping can enhance the peak shear strength and interface stability of coal–backfilling composite structure. After CFRP wrapping, coal–backfilling composite structure can undergo more crack initiation and propagation. The interior of CFRP-wrapped specimen can withstand greater loads. After CFRP wrapping, the internal friction angle of specimen increases, further enhancing its shear strength.