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首页> 外文会议>Asia Pacific Symposium on Safety; 20051102-04; Shaoxing(CN) >Effect of Elastic Modulus on Deformation and Failure of Model of Two Bodies Composed of Rock and Coal
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Effect of Elastic Modulus on Deformation and Failure of Model of Two Bodies Composed of Rock and Coal

机译：弹性模量对岩石和煤两体模型变形和破坏的影响

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摘要

FLAC was adopted to investigate the macroscopically mechanical behaviors for the model of two bodies composed of elastic rock and elastoplastic coal, the evolution of shear strain increment within coal, the failure modes and the precursor to unstable failure of coal. For coal, the adopted constitutive relation in elastic stage was linear; in strain-softening stage a composite Mohr-Coulomb criterion with tension cut-off and a post-peak linear constitutive relation were adopted. Higher elastic modulus of rock leads to higher elastic modulus; higher dissipated energy of coal in the form of localized shear deformation and uniform plastic deformation outside shear bands, and slightly higher peak strength of coal or the model. However, the slope of softening branch of stress-strain curve and the failure mode of coal are not nearly concerned with the elastic modulus of rock. With an increase of axial strain along the direction of height of the model, shear strain increment within coal transforms from the uniform to nonuniform distributions so that V-type shear bands are observed. In the strain-softening process of coal, the recovery of shear strain occurs outside shear bands. When the peak strength of coal is just reached, the value of shear strain increment within coal is increased with decreasing elastic modulus of rock. This means that the precursor to the unstable failure of coal (rock burst of coal pillar), which occurs in strain-softening stage of coal, is more apparent for lower elastic modulus of rock. The present numerical results enhance the understanding of the interaction between roof or floor and coal pillar.
机译：采用FLAC技术研究了由弹性岩石和弹塑性煤组成的两个物体模型的宏观力学行为，煤内剪切应变增量的演化，破坏模式以及不稳定不稳定煤的形成。对于煤，弹性阶段采用的本构关系是线性的。在应变软化阶段，采用了具有拉力截止和峰后线性本构关系的复合Mohr-Coulomb准则。岩石的弹性模量越高，弹性模量越高；煤的耗散能量较高，其形式为剪切带以外的局部剪切变形和均匀塑性变形，以及峰值较高的煤或模型。然而，应力-应变曲线的软化分支斜率和煤的破坏模式与岩石的弹性模量几乎没有关系。随着轴向应变沿模型高度方向的增加，煤中的剪切应变增量从均匀分布转变为不均匀分布，从而观察到V型剪切带。在煤的应变软化过程中，剪切应变的恢复发生在剪切带之外。当刚达到煤的峰值强度时，煤中的剪切应变增量值随岩石的弹性模量的减小而增加。这意味着在煤的应变软化阶段发生的煤不稳定破坏（煤柱的岩石破裂）的前兆对于较低的岩石弹性模量更为明显。当前的数值结果增强了对屋顶或地板与煤柱之间相互作用的理解。

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