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<p>The uniaxial compressive strength of the filling material is usually used as the filling index for backfill mining technology, but the filling body is mostly in a triaxial compressive state in actual fact. In this paper, uniaxial and triaxial compression tests were carried out on cemented tailings backfill (CTB) with different solid concentrations (70, 72, 74, 76, and 78 wt%) and different cement/tailings ratios (1: 4, 1:6, 1:8, 1:10). The constitutive characteristics, basic mechanical parameters, and energy dissipation characteristics under different compression conditions were analyzed. And a two-stage triaxial compression constitutive model was constructed. The results show that (1) under different compression conditions, the values of peak strain, peak stress, and elastic modulus of CTB are 0.5–0.8%, 1.4–7.5&#xa0;MPa, and 0.2–2.3 GPa and 1.1–4.5%, 6.7–12.9&#xa0;MPa, and 0.9–1.4 GPa, respectively. (2) The triaxial compressive strength of CTB under lateral restraint is about 2 times that of uniaxial, and the deformation capacity is about 4 times. (3) When the strain exceeds 1.3%, the elastic deformation energy of CTB tends to be stable under both conditions, and all the input energy is converted into plastic damage energy. This study provides a theoretical basis for the selection of filling materials.</p>

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Comparative Analysis of Uniaxial and Triaxial Compression Characteristics of Cement Tailings Backfill

  • 期刊论文

  • 发表日期：

    2025年1月19日

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  • Bingbing Tu,
  • Haiqiang He,
  • Lang Liu,
  • Xiang Ding,
  • Qixing Yang

摘要

The uniaxial compressive strength of the filling material is usually used as the filling index for backfill mining technology, but the filling body is mostly in a triaxial compressive state in actual fact. In this paper, uniaxial and triaxial compression tests were carried out on cemented tailings backfill (CTB) with different solid concentrations (70, 72, 74, 76, and 78 wt%) and different cement/tailings ratios (1: 4, 1:6, 1:8, 1:10). The constitutive characteristics, basic mechanical parameters, and energy dissipation characteristics under different compression conditions were analyzed. And a two-stage triaxial compression constitutive model was constructed. The results show that (1) under different compression conditions, the values of peak strain, peak stress, and elastic modulus of CTB are 0.5–0.8%, 1.4–7.5 MPa, and 0.2–2.3 GPa and 1.1–4.5%, 6.7–12.9 MPa, and 0.9–1.4 GPa, respectively. (2) The triaxial compressive strength of CTB under lateral restraint is about 2 times that of uniaxial, and the deformation capacity is about 4 times. (3) When the strain exceeds 1.3%, the elastic deformation energy of CTB tends to be stable under both conditions, and all the input energy is converted into plastic damage energy. This study provides a theoretical basis for the selection of filling materials.