首页|Effect of Elastic Modulus on Deformation and Failure of Model of Two Bodies Composed of Rock and Coal
Effect of Elastic Modulus on Deformation and Failure of Model of Two Bodies Composed of Rock and Coal
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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。
model of two bodiescoalrockshear strainshear bandsstress-strain curveprecursorrock burst
WANG Xuebin
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Department of Mechanics and Engineering Sciences, Liaoning Technical University, Fuxin 123000, Liaoning, China
Progress in Safety Science and Technology vol.5 pt.B
Shaoxing(CN)
Asia Pacific Symposium on Safety; 20051102-04; Shaoxing(CN)
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