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<p>Investigating the shear behaviour of the rock–cemented tailings backfill natural interface (RCNI) is crucial for maintaining the stability of cemented tailings backfill (CTB). However, research on the effects of the cement–sand ratio on RCNI shear behaviour is limited, and corresponding damage constitutive models are lacking. A series of direct shear tests were conducted on rock–CTB samples to investigate the effects of the cement–sand ratio on RCNI shear performance. The findings indicated that increased cement–sand ratios led to higher shear strength and distinct strain softening characteristics. A damage constitutive model was proposed to describe the complete shear behaviour process of the RCNI. Reducing the cement–sand ratio decreased brittleness, shear strength, and deformability, while increasing normal stress resulted in a higher brittleness index due to shear strength enhancement outpacing deformability reduction. The mechanisms governing various microscopic units within the RCNI were clarified through stress evolution analysis. Additionally, SEM observations revealed the effects of cement–sand ratio and normal stress on interfacial damage from a microscopic perspective. This study provides a theoretical model for predicting RCNI shear slip, offering insights for future research and practical applications.</p>

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Damage analysis of shear mechanical behaviour of rock–cemented tailings backfill natural interface considering cement–sand ratio effect

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Wenkai Ru,
  • Diyuan Li,
  • Hao Gong,
  • Zhenyu Han

摘要

Investigating the shear behaviour of the rock–cemented tailings backfill natural interface (RCNI) is crucial for maintaining the stability of cemented tailings backfill (CTB). However, research on the effects of the cement–sand ratio on RCNI shear behaviour is limited, and corresponding damage constitutive models are lacking. A series of direct shear tests were conducted on rock–CTB samples to investigate the effects of the cement–sand ratio on RCNI shear performance. The findings indicated that increased cement–sand ratios led to higher shear strength and distinct strain softening characteristics. A damage constitutive model was proposed to describe the complete shear behaviour process of the RCNI. Reducing the cement–sand ratio decreased brittleness, shear strength, and deformability, while increasing normal stress resulted in a higher brittleness index due to shear strength enhancement outpacing deformability reduction. The mechanisms governing various microscopic units within the RCNI were clarified through stress evolution analysis. Additionally, SEM observations revealed the effects of cement–sand ratio and normal stress on interfacial damage from a microscopic perspective. This study provides a theoretical model for predicting RCNI shear slip, offering insights for future research and practical applications.