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不同弹模时圆形巷道围岩的应变局部化数值模拟

王学滨 王玮 潘一山

王学滨, 王玮, 潘一山, 2011. 不同弹模时圆形巷道围岩的应变局部化数值模拟. 地质力学学报, 17 (2): 200-210.
引用本文: 王学滨, 王玮, 潘一山, 2011. 不同弹模时圆形巷道围岩的应变局部化数值模拟. 地质力学学报, 17 (2): 200-210.
WANG Xue-bin, WANG Wei, PAN Yi-shan, 2011. NUMERICAL SIMULATION OF THE STRAIN LOCALIZATION OF A CIRCULAR TUNNEL AT DIFFERENT ELASTIC MODULI. Journal of Geomechanics, 17 (2): 200-210.
Citation: WANG Xue-bin, WANG Wei, PAN Yi-shan, 2011. NUMERICAL SIMULATION OF THE STRAIN LOCALIZATION OF A CIRCULAR TUNNEL AT DIFFERENT ELASTIC MODULI. Journal of Geomechanics, 17 (2): 200-210.

不同弹模时圆形巷道围岩的应变局部化数值模拟

基金项目: 

国家自然科学基金项目 50974069

辽宁省教育厅科学研究一般项目 2009A322

详细信息
    作者简介:

    王学滨(1975-), 男, 黑龙江双鸭山市, 博士, 教授, 博导, 从事非均质材料(岩石、混凝土及金属等)变形、破坏及稳定性研究。E-mail:wxbbb@263.net; Tel:(0418)-3350924

  • 中图分类号: TU45

NUMERICAL SIMULATION OF THE STRAIN LOCALIZATION OF A CIRCULAR TUNNEL AT DIFFERENT ELASTIC MODULI

  • 摘要: 利用基于运动方程求解的FLAC程序模拟了不同弹性模量时圆形巷道的应变局部化过程。在计算中, 采用了"先加载, 后挖洞"方式。模拟结果表明, 在弹性模量中等或较小的条件下, 由于开挖卸荷而产生的围岩向空腔内部的"涌入"(运动)现象比较明显, 进而围岩中诱发了较多的破坏、V形坑或短剪切带式破坏。在上述条件下, 基于静力平衡的解析及数值方法不再适用, 而且是偏于不安全的。弹性模量越小, 开挖之后, 围岩维持其均匀周向(或环向)变形的能力越差, 这种轴对称变形越容易被打破, 也被打破得越早。尽管随着弹性模量的增加, 破坏单元数的变化并不是单调的, 但是在总体上, 随着弹性模量的增加, 破坏单元数目降低, 最大剪切应变增量急剧单调下降。

     

  • 图  1  模型的几何特征及边界条件

    (a)巷道开挖之前; (b)巷道开挖之后

    Figure  1.  Model geometry and boundary conditions

    图  2  各方案围岩的破坏样式(时步= 60000)

    (a)方案1; (b)方案2; (c)方案3; (d)方案4; (e)方案5; (f)方案6; (g)方案7; (h)方案8; (i)方案9; (j)方案10; (k)方案11; (l)方案12; (m)方案13; (n)方案14

    Figure  2.  Failure modes in schemes 1 to 14 (step = 60000)

    图  3  方案1的破坏过程(a-h)及最大失衡力-时步曲线(i)

    Figure  3.  The failure process (a-h) of Scheme 1 and the maximum unbalanced force-timestep curve (i)

    图  4  方案8的破坏过程(a-d)及最大失衡力-时步曲线(e)

    Figure  4.  The failure process (a-d) of Scheme 8 and the maximum unbalanced force-timestep curve (e)

    图  5  方案12的破坏过程(a-g)及最大失衡力-时步曲线(h)

    Figure  5.  The failure process (a-g) of Scheme 12 and the maximum unbalanced force-timestep curve (h)

    图  6  不同方案的破坏单元数及最大剪切应变增量

    Figure  6.  The numbers of failed elements and the maximum shear strain increments in different schemes

    图  7  V形坑(a-b) [67]及短剪切带(c) [8]

    Figure  7.  The V-shaped notches (a-b) [67] and shorter shear bands (c) [8]

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出版历程
  • 收稿日期:  2010-03-20
  • 刊出日期:  2011-06-01

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