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Anisotropic characteristics of layered backfill:Mechanical properties and energy dissipation

Journal of Rock Mechanics and Geotechnical Engineering 2023年第12期15卷 3188-3208页

作者： Huisheng Qu Lang Liu Yonglu Suo Mengbo Zhu Pan Yang Caixing Zhang Geng Xie Energy School Xi’an University of Science and TechnologyXi’an710054China Key Laboratory of Western Mines and Hazards Prevention Ministry of Education of ChinaXi’an710054China

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.

关键词： layered backfill Delamination par ameters Anisotropic mechanical behavior P-wave velocity Energy dissipation characteristics Acoustic emission(AE)

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Axi-symmetric Active Earth Pressure for layered backfills Obtained by the Slip Line Method

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Journal of Shanghai Jiaotong university(Science) 2008年第5期13卷 579-584页

作者：刘发前王建华张璐璐 School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University

The axi-symmetric active earth pressure for layered backfills was investigated using the slip line method. Due to different soil properties, the interfaces of the soil layers were considered as discontinuity surface. Accordingly, the change of the major principal direction was obtained and a new computation scheme was proposed to deal with the discontinuity in the calculation, finally the slip line method was extended to layered backfills. Results indicate that, the major principal direction, as well as the earth pressure, has a finite jump on passing the soil interfaces. The magnitude of the jump depends on the soil properties mainly. Generally, the active earth pressure when a strong layer is overlying a weak layer is much larger than that when the weak layer is lying on the strong layer. The present solution can be reduced to plane strain case and it has been compared with Rankine's and Coulomb's results, and a good agreement is observed.

关键词： axi-symmetry earth pressure slip line method layered backfill soil-wall friction

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