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Synergistic Bearing Effect and Failure Mechanism of Backfill–Coal Pillar Composite Structure.

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Title: Synergistic Bearing Effect and Failure Mechanism of Backfill–Coal Pillar Composite Structure.
Authors: Wang, Guangtao1 (AUTHOR), An, Yanpei1 (AUTHOR), Wu, Quansen1 (AUTHOR) 201910010@jnxy.edu.cn, Wu, Quanlin1 (AUTHOR), Li, Hao1 (AUTHOR), Zhaofei, Chu1 (AUTHOR) zhaofeichu@whu.edu.cn
Source: Advances in Civil Engineering. 4/25/2026, Vol. 2026, p1-21. 21p.
Subjects: Mechanical models, Particle methods (Numerical analysis), Filler materials, Materials compression testing, Structural components, Energy dissipation, Structural failures
Abstract: Constructing backfill walls adjacent to the yield coal pillar can effectively enhance its stability. The backfill and coal pillar form a synergistic bearing structure that jointly maintains the stability of the overlying strata. To reveal the synergistic bearing effect and failure mechanism of the backfill–coal pillar structure, this study first investigated the AE characteristics and energy evolution of the composite structure through uniaxial compression tests. An energy dissipation damage constitutive model was established. Subsequently, a particle flow code (PFC) model was established to study the crack propagation of the backfill–coal pillar structure. Finally, a mechanical model was developed to analyze the equivalent mechanical parameters of the backfill–coal pillar structure and elucidate its failure mechanism. The results indicate that: (1) Equal‐width backfill and coal pillar exhibit optimal synergistic load‐bearing effects. As the width of the coal pillar increases, the mechanical properties of the composite structure degrade nonlinearly. (2) The failure mode of the composite structure is predominantly tensile, supplemented by shear failure, with the coal pillar failing before the backfill. (3) Narrower backfills become more prone to failure under coal pillar lateral pressure. This study provides valuable insights for engineering applications involving coal pillar reinforcement using backfill walls. [ABSTRACT FROM AUTHOR]
Copyright of Advances in Civil Engineering is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Synergistic Bearing Effect and Failure Mechanism of Backfill–Coal Pillar Composite Structure.
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  Data: <searchLink fieldCode="JN" term="%22Advances+in+Civil+Engineering%22">Advances in Civil Engineering</searchLink>. 4/25/2026, Vol. 2026, p1-21. 21p.
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  Data: <searchLink fieldCode="DE" term="%22Mechanical+models%22">Mechanical models</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+methods+%28Numerical+analysis%29%22">Particle methods (Numerical analysis)</searchLink><br /><searchLink fieldCode="DE" term="%22Filler+materials%22">Filler materials</searchLink><br /><searchLink fieldCode="DE" term="%22Materials+compression+testing%22">Materials compression testing</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+components%22">Structural components</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+dissipation%22">Energy dissipation</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+failures%22">Structural failures</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Constructing backfill walls adjacent to the yield coal pillar can effectively enhance its stability. The backfill and coal pillar form a synergistic bearing structure that jointly maintains the stability of the overlying strata. To reveal the synergistic bearing effect and failure mechanism of the backfill–coal pillar structure, this study first investigated the AE characteristics and energy evolution of the composite structure through uniaxial compression tests. An energy dissipation damage constitutive model was established. Subsequently, a particle flow code (PFC) model was established to study the crack propagation of the backfill–coal pillar structure. Finally, a mechanical model was developed to analyze the equivalent mechanical parameters of the backfill–coal pillar structure and elucidate its failure mechanism. The results indicate that: (1) Equal‐width backfill and coal pillar exhibit optimal synergistic load‐bearing effects. As the width of the coal pillar increases, the mechanical properties of the composite structure degrade nonlinearly. (2) The failure mode of the composite structure is predominantly tensile, supplemented by shear failure, with the coal pillar failing before the backfill. (3) Narrower backfills become more prone to failure under coal pillar lateral pressure. This study provides valuable insights for engineering applications involving coal pillar reinforcement using backfill walls. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Advances in Civil Engineering is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1155/adce/9955810
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        Text: English
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        PageCount: 21
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        Type: general
      – SubjectFull: Particle methods (Numerical analysis)
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      – SubjectFull: Filler materials
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      – SubjectFull: Materials compression testing
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      – SubjectFull: Structural components
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      – SubjectFull: Energy dissipation
        Type: general
      – SubjectFull: Structural failures
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    Titles:
      – TitleFull: Synergistic Bearing Effect and Failure Mechanism of Backfill–Coal Pillar Composite Structure.
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            NameFull: Wang, Guangtao
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              Text: 4/25/2026
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              Y: 2026
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