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The Waste Isolation Pilot Plant A Potential Solution for the Disposal of Transuranic Waste (1996) / Chapter Skim
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D. CREEP BEHAVIOR OF WIPP SALT
Pages 123-128

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From page 123...
... Initial predictions of the rate of closure of underground excavations based on deformation parameters denved from laboratory tests were found to be some three to six times lower than the closure rates observed underground. Continued research to improve fundamental understanding has resulted in a very substantial reduction in this discrepancy.
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From page 124...
... Note the Increase in measured closure compared to calculated closure as roof failures develop. Source: Munson (l 996~.
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From page 125...
... G 6.1 m _ B" 1~0 12 - 1400 tSOO TIME (Days) FIGURE D.2 Comparison between predicted and actual room closure rates for Room G
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From page 126...
... 126 ~7PP A Potential Solution for the Disposal of Transuranic Waste CONSTANT STRESS At a: an g`~Q' CREEP CURVE WITH _ / FRACTURE CONTRIBUTION / Cal it, AX _ -! eG~CONTINUUM CREEP CURVE WITHOUT FRACTURE CONTRIBUTION <~'t~,~f ' boy 5~ ~ / TRANSIENT CREEP _ - / COMPONENT / 1 _ / _ I I ~ , _ | _ - ~ I ST~DY STATE CREEP _- 1 ~ COMPONENT TIME FIGURE D.3 Classical creep-deformation behavior of salt.
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From page 127...
... es3 HI ~O) iB~e +B2e Q2 Sing where A and B are constants; Q is the activation energy; T is the absolute temperature; R is the universal gas constant; ~ is the shear modulus; c' is the generalized stress, n is the stress exponent; g is the stress constant; a0 is the lower stress limit of the dislocation slip mechanism; and H is the Heaviside step Unction with argument ~ - a0 [i.e., H(o - a0 )
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From page 128...
... The isotropic condition and the creep flow characteristic of salt imply that salt in situ should be essentially impermeable, since the connected pathways needed to allow flow of fluid would lead to localized stress concentrations in the vicinity of the connected cracks, etc., that represent the permeability. AMP: A Potential Solution for the Disposal of Transuranic Waste Such concentrations (stress differences)
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Key Terms

  • shear stress
  • closure rates
  • stress state
  • strain rate
  • wipp salt

  • yield criterion
  • applied stress
  • elastic strain
  • creep rate
  • generalized stress

  • low strain
  • stress yield
  • rates associated
  • essentially constant
  • shear modulus

  • von mises
  • allow flow
  • pilot plant
  • pressure required
  • measured closure

  • connected cracks
  • special measures
  • essentially impermeable
  • lithostatic pressure
  • stress exponent

  • closure compared
  • stress level
  • localized stress
  • fundamental mechanism
  • dislocation slip


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