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This study evaluates the stability of cemented backfill in deep mining through theoretical models (Thomas, Terzaghi, Mitchell, Yang Xin, overburden-bearing capacity, Cai Sijing) and FLAC3D numerical simulations. Results show vertical stress at the base correlates strongly with backfill height (R2 = 0.98) and varies minimally with stope length (<5%). For a 60 m-high backfill, theoretical predictions range 0.92–1.53 MPa, with numerical simulations aligning closely (1.21 MPa). The Cai Sijing method yields conservative estimates (1.53 MPa). Incorporating dynamic roof loads (0.82 MPa), the recommended design strength is 1.13–1.53 MPa. Primary stopes require strength R₂₈ = 0.025h + 1.17 MPa (h = 10–60 m), secondary stopes 0.6 MPa, and critical zones ≥3.0 MPa. Safety factors (1.2–2.0) and binder-tailings ratios (1:4–1:8) are proposed, balancing safety and feasibility for deep mining applications.

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Research on the Exposure Stability of Full Tailings Cemented Backfill

  • 会议论文

  • 发表日期：

    2026年

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  • Xueshan Bai,
  • Yuchuan Zhao,
  • De Tian,
  • Xueliang Yang,
  • Huijie Liang,
  • Minghui Gao

摘要

This study evaluates the stability of cemented backfill in deep mining through theoretical models (Thomas, Terzaghi, Mitchell, Yang Xin, overburden-bearing capacity, Cai Sijing) and FLAC3D numerical simulations. Results show vertical stress at the base correlates strongly with backfill height (R2 = 0.98) and varies minimally with stope length (<5%). For a 60 m-high backfill, theoretical predictions range 0.92–1.53 MPa, with numerical simulations aligning closely (1.21 MPa). The Cai Sijing method yields conservative estimates (1.53 MPa). Incorporating dynamic roof loads (0.82 MPa), the recommended design strength is 1.13–1.53 MPa. Primary stopes require strength R₂₈ = 0.025h + 1.17 MPa (h = 10–60 m), secondary stopes 0.6 MPa, and critical zones ≥3.0 MPa. Safety factors (1.2–2.0) and binder-tailings ratios (1:4–1:8) are proposed, balancing safety and feasibility for deep mining applications.