Experimental study on the fracture evolution of cemented waste rock-tailings backfill (CWRB) of metal ore using in-situ CT scanning

YI Xue-feng; LIU Chun-kang; WANG Yu

doi:10.16285/j.rsm.2019.1962

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Experimental study on the fracture evolution of cemented waste rock-tailings backfill (CWRB) of metal ore using in-situ CT scanning

更新时间：2026-06-25

- Experimental study on the fracture evolution of cemented waste rock-tailings backfill (CWRB) of metal ore using in-situ CT scanning
- Vol. 41, Issue 10, Pages: 3365-3373(2020)
- 作者机构：
  
  北京科技大学土木与资源工程学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2019.1962
  CLC： TD926.4
- Online First：07 November 2020，
  
  Published：2020
- 稿件说明：
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YI Xue-feng, LIU Chun-kang, WANG Yu. Experimental study on the fracture evolution of cemented waste rock-tailings backfill (CWRB) of metal ore using in-situ CT scanning[J]. 2020, 41(10): 3365-3373.
DOI：

YI Xue-feng, LIU Chun-kang, WANG Yu. Experimental study on the fracture evolution of cemented waste rock-tailings backfill (CWRB) of metal ore using in-situ CT scanning[J]. 2020, 41(10): 3365-3373. DOI： 10.16285/j.rsm.2019.1962.

摘要

为了揭示金属矿尾废胶结充填体（CWRB）破裂过程中的细观力学特性及尾废胶结协同作用机制，采用单轴压缩实时CT扫描力学试验对废石含量（WBP）为0%（全尾砂胶结充填体）、30%、50%和70%的充填体损伤破裂演化过程进行了可视化和数字化表征，揭示了充填体细观损伤和破裂演化的内在力学机制。结果表明，尾废胶结充填体中的废石含量会影响应力?应变响应，随着废石含量的增加，充填体的强度也会增加。强度增加的主要原因是试样中挠曲破裂面扩展的地质力学效应。充填体开裂后裂纹的形状受废石块形状、大小和分布的影响。基质?块体交接界面为充填体中最薄弱的部分。裂纹的形成和扩展最终导致了尾废胶结充填体的应力剪胀行为。界面损伤开裂控制了试样中裂纹扩展路径及强度特性。尾废胶结充填体的强度效应取决于块石的含量，废石?废砂胶结充填体的相互作用控制着试样强度的增加，块石间的互锁作用对于提高试样的整体刚度具有重要影响。该研究成果对于金属矿固废绿色处置及矿产资源的可持续开发具有理论指导意义。

Abstract

In order to reveal the meso-mechanical characteristics during the fracture process of the cemented waste rock-tailings backfill (CWRB) of metal ore and the synergistic mechanism of the tail-sludge cementation

uniaxial compression real-time CT scanning mechanical test was carried out to visualize and digitize the damage evolution process of the filling body with waste block proportions (WBP) of 0% (full tailings cemented backfill)

30%

50% and 70%. The mesoscopic mechanism of mesoscopic damage and cracking and fracture evolution of CWRB was revealed. The results show that the WBP in the CWRB could affect the stress-strain response. As the WBP increases

the strength of the filling body increases. The main reason for the increase in strength is attributed to the propagation of the curved fracture surface in the sample. Related geomechanical effects

the crack morphology after the cracking of the filling body was affected by the shape

size and distribution of the waste rock. The matrix-block interface is the weakest part of the filling body. The formation and propagation of cracks eventually lead to the stress dilatancy behavior of CWRB. The damage and cracking on the interface control the crack propagation path and strength characteristics. The strength effect of CWRB depends on the content of block stone. The interaction between waste rock and waste sand controls the increase of sample strength

and the interlocking effect between blocks and rocks has an important impact on improving the overall stiffness of the sample. The research results have theoretical significance for the green disposal of solid waste and sustainable development of mineral resources

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