Anisotropic characteristics of layered backfill:Mechanical properties and energy dissipation

作     者：Huisheng Qu Lang Liu Yonglu Suo Mengbo Zhu Pan Yang Caixing Zhang Geng Xie Huisheng Qu;Lang Liu;Yonglu Suo;Mengbo Zhu;Pan Yang;Caixing Zhang;Geng Xie

作者机构：Energy SchoolXi’an University of Science and TechnologyXi’an710054China Key Laboratory of Western Mines and Hazards PreventionMinistry of Education of ChinaXi’an710054China 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2023年第15卷第12期

页      面：3188-3208页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：国家自然科学基金 

主　　题：Layered backfill Delamination par ameters Anisotropic mechanical behavior P-wave velocity Energy dissipation characteristics Acoustic emission(AE) 

摘      要：Layered backfill is commonly used in mining operations,and its mechanical behavior is strongly influenced by delamination *** this study,13 specimens with different numbers of delamination and delamination angle were prepared to investigate the anisotropic mechanical behavior,energy dissipation characteristics and crack development of backfill.P-wave velocity,uniaxial compression,scanning electron microscope(SEM),and acoustic emission(AE)experiments were *** results indicate that:(1)The P-wave velocity has linear and elliptical relationships with the number of delamination surface and delamination angle,respectively;the strength,delamination parameters and P-wave velocity show a high degree of coincidence in terms of their function relationship,which can realize the rapid prediction of strength.(2)The microstructure of the delaminated surface is looser than that of the matrix,leading to a decrease in strength and an increase at the pore-fissure compaction *** number and angle of delamination increase linearly with the anisotropy coefficient.(3)The energy evolution in angle-cut backfill can be divided into four stages,with a decrease in the proportion of elastic energy at the initiation stress and peak stress with increasing number of delamination planes and delamination angle.(4)Crack development increases with the number of delamination surface and delamination angle,resulting in a decrease in energy dissipation coefficient and peak AE *** findings provide valuable insights for the design of filling materials and processes in mining operations.