Acoustic emission characteristics and damage evolution process of layered cemented tailings backfill under uniaxial compression
Acoustic emission characteristics and damage evolution process of layered cemented tailings backfill under uniaxial compression
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单轴压缩层状胶结尾矿充填声发射特性及损伤演化过程
DOI：
10.1016/j.conbuildmat.2021.123663
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发表时间：
2021-05-25
影响因子：
7.4
通讯作者：
Wu, Shan
中科院分区：
文献类型：
--
作者：
Wang, Jie;Fu, Jianxin;Wu, Shan
为了解层状尾砂胶结充填体的破坏模式、裂纹演化及损伤本构关系，对4种不同类型尾砂胶结充填体进行了单轴压缩试验。试验结果表明：(1)高度（h(1)/ h）比越大，灰尾料（c/t）比越小，单轴抗压强度（UCS）和弹性模量（EM）越小。LCTB主要表现为拉伸破坏。(2)声发射信号的演化特征呈先上升后下降的倒u型分布。它可以分为五个阶段：安静期、缓慢上升期、快速上升期、快速下降期和缓慢下降期。(3)建立了预测LCTB失效的尖点突变模型。预测结果准确。建立了LCTB的损伤本构模型。LCTB的总损伤D由损伤值D-1和D-2组成。所有损伤曲线均呈现先缓慢上升后快速上升，最后再次缓慢上升并接近最大值的s型分布。(C) 2021 Elsevier Ltd版权所有。
In order to understand the failure mode, crack evolution and damage constitutive relationship of layered cemented tailings backfill (LCTB), the uniaxial compression test were carried out on four different types of LCTB. Test results show that: (1) The greater the height (h(1)/H) ratio and the smaller the cement-to-tailings (c/t) ratio, the smaller the uniaxial compressive strength (UCS) and elastic modulus (EM). The LCTB is mainly manifested as tensile failure. (2) The evolution characteristics of acoustic emission (AE) signal show an inverted U-shaped distribution, which first rises and then falls. It can be divided into five stages: quiet period, slow rising period, fast rising period, fast falling period, and slow falling period. (3) A cusp catastrophe model was established to predict the failure of LCTB. The prediction results are accurate. A damage constitutive model of LCTB was constructed. The total damage D of LCTB is composed of the damage value D-1 and D-2. All damage curves demonstrate an S-shaped distribution, first rising slowly, then rising quickly, and finally rising slowly again and approaching the maximum. (C) 2021 Elsevier Ltd. All rights reserved.