A combined experimental and numerical study on the triaxial and dynamic compression behavior of cemented tailings backfill
A combined experimental and numerical study on the triaxial and dynamic compression behavior of cemented tailings backfill
复制标题
DOI：
10.1016/j.engstruct.2020.110957
复制
发表时间：
2020-09
影响因子：
5.5
通讯作者：
Lei Yang;Wen-bin Xu;E. Yilmaz;Qiang Wang;Jingping Qiu
中科院分区：
文献类型：
--
作者：
Lei Yang;Wen-bin Xu;E. Yilmaz;Qiang Wang;Jingping Qiu
充分了解尾砂胶结充填体在各种载荷作用下的力学响应，对矿山工程应用具有重要意义。本文通过实验研究了不同围压和围压分量的三轴压缩载荷下CTB的应力-应变响应、破坏模式和破坏准则。微观结构分析也揭示了围压如何影响CTB的变形行为。随后，三轴抗压强度数据被用来校准的Holmquist-Johnson-Cook（HJC）模型CTB的本构参数。在HJC模型标定的基础上，利用商用有限元软件LS-DYNA建立了分离式霍普金森压杆（SHPB）模型，研究了侧向初始约束和端部摩擦约束对不同组分CTB动态压缩强度的影响。
A full understanding of the mechanical response of cemented tailings backfill (CTB) under various loading scenarios is beneficial for mining engineering applications. This study experimentally investigates the stress–strain response, failure pattern and criteria of CTB under triaxial compression loading with various confining pressures and components. Microstructural analyses are also conducted to reveal how the confining pressure influences the deformation behavior of CTB. Later, triaxial compression strength data are used to calibrate the constitutive parameters of the Holmquist-Johnson-Cook (HJC) model for CTB. Following the HJC model calibration, a split Hopkinson pressure bar (SHPB) model is established by using the commercial finite element software LS-DYNA to evaluate the effect of the lateral initial confinement and end-friction confinement on the dynamic compression strength of CTB with various components.