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不同倾角充-岩组合体三轴压缩力学特性及破坏特征

徐文彬 陈伟

徐文彬, 陈伟. 不同倾角充-岩组合体三轴压缩力学特性及破坏特征[J]. 矿业科学学报, 2023, 8(5): 633-641. doi: 10.19606/j.cnki.jmst.2023.05.005
引用本文: 徐文彬, 陈伟. 不同倾角充-岩组合体三轴压缩力学特性及破坏特征[J]. 矿业科学学报, 2023, 8(5): 633-641. doi: 10.19606/j.cnki.jmst.2023.05.005
Xu Wenbin, Chen Wei. The triaxial compressive mechanical properties and failure characteristics of backfill-rock combined bodies with different interface angles[J]. Journal of Mining Science and Technology, 2023, 8(5): 633-641. doi: 10.19606/j.cnki.jmst.2023.05.005
Citation: Xu Wenbin, Chen Wei. The triaxial compressive mechanical properties and failure characteristics of backfill-rock combined bodies with different interface angles[J]. Journal of Mining Science and Technology, 2023, 8(5): 633-641. doi: 10.19606/j.cnki.jmst.2023.05.005

不同倾角充-岩组合体三轴压缩力学特性及破坏特征

doi: 10.19606/j.cnki.jmst.2023.05.005
基金项目: 

国家重点研发计划 2018YFE0123000

中央高校基本科研业务费专项资金 2023JCCXNY01

详细信息
    作者简介:

    徐文彬(1985— ),男,江西上饶人,博士,副教授,博士生导师,主要从事充填开采与岩层控制方面的研究工作。Tel:18612987658,E-mail:xuwb08@163.com

  • 中图分类号: TD315

The triaxial compressive mechanical properties and failure characteristics of backfill-rock combined bodies with different interface angles

  • 摘要: 为探究交界面倾角β对充填体与围岩组合体(充-岩组合体)三轴力学特性影响规律,开展β为0°、15°、30°、45°和60°的充-岩组合体三轴压缩试验,对比分析了不同交界面倾角组合体的力学特性、破坏特征与强度演化规律。试验结果表明:当β≤30°时,组合体的应力-应变曲线可划分为孔隙压密、弹性变形、塑性变形和破坏发展4个阶段,其破坏特征以充填体压剪破坏为主;随着交界面倾角增加,组合体在达到峰值强度后应力陡降,无明显塑性变形和破坏发展阶段,其破坏特征由充填体内部压剪破坏逐渐转变为沿交界面滑移破坏;组合体的峰值强度随着交界面倾角增加先增大后减小,β=30°时峰值强度达到极大值。基于单弱面理论得到组合体滑移破坏的交界面临界倾角为57°~68°,其中β=60°时组合体发生沿交界面滑移破坏,理论计算与试验结果相吻合。
  • 图  1  三轴试验机与试样

    Figure  1.  Triaxial testing mechine and sample

    图  2  不同围压下组合体应力-应变曲线

    Figure  2.  Stress-strain curves of the combined bodies with different confining pressure

    图  3  不同围压下组合体破坏特征

    Figure  3.  Failure characteristics of combined bodies with different confining pressures

    图  4  组合体峰值强度与围压和交界面倾角的关系

    Figure  4.  The relationship between peak strength, confining pressure and interface angles of combined bodies

    图  5  组合体交界面受力分析

    Figure  5.  Force analysis on the interface of the combined bodies

    图  6  峰值强度与围压关系(β=0°)

    Figure  6.  Relationship between peak strength and confining pressure(β=0°)

    图  7  单弱面理论

    Figure  7.  Single weak plane theory

    图  8  剪切应力与法向应力关系(β=60°)

    Figure  8.  Relationship between shear stress and normal stress(β=60°)

    表  1  材料力学参数

    Table  1.   Mechanicals parameters of materials

    试样 单轴抗压强度/MPa 密度/(g·cm-3) 波速/(m·s-1)
    充填体 3.12 1.94 2 333
    类岩石 11.67 2.24 3 125
    下载: 导出CSV

    表  2  不同交界面倾角组合体拟合曲线方程

    Table  2.   Fitting curve equations for combined bodies with different interface angles

    倾角/(°) 曲线方程 相关系数R2
    0 σ1=3.49+5.93σ3 0.96
    15 σ1=3.71+5.49σ3 0.95
    30 σ1=4.08+6.02σ3 0.97
    45 σ1=3.15+6.47σ3 0.95
    60 σ1=2.82+5.79σ3 0.99
    下载: 导出CSV

    表  3  不同交界面倾角组合体黏聚力和内摩擦角

    Table  3.   Cohesion and internal friction angle of the combined bodies with different interface angles

    倾角/(°) 黏聚力/kPa 内摩擦角/(°)
    0 716.15 45.4
    15 792.27 43.8
    30 831.40 45.7
    45 620.09 47.1
    下载: 导出CSV

    表  4  不同围压下β1β2

    Table  4.   β1 and β2 under different confining pressures

    σ3/kPa β1/(°) β2/(°)
    0 58.8 65.7
    100 57.2 67.3
    200
    300 59.5 65.0
    400 58.9 65.6
    下载: 导出CSV
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  • 收稿日期:  2023-04-10
  • 修回日期:  2023-05-05
  • 刊出日期:  2023-10-31

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