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NESC9846 VISCOT.

VISCOT, Viscous Mechanical Behaviour of Rock Mass Under Thermal Stress

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1. NAME OR DESIGNATION OF PROGRAM:  VISCOT.
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2. COMPUTERS
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Program name Package id Status Status date
VISCOT NESC9846/01 Tested 15-FEB-1990

Machines used:

Package ID Orig. computer Test computer
NESC9846/01 CDC CYBER 176 CDC CYBER 830
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3. DESCRIPTION OF PROGRAM OR FUNCTION

VISCOT is a nonlinear, transient, thermal-stress, finite-element program designed to determine the viscoelastic, viscoplastic, or elastoplastic deformation of a rock mass due to mechanical and thermal loading.
A major application of VISCOT in conjunction with a SCEPTER heat transfer code, e.g. DOT-BPMD (NESC 9833), is the thermomechanical analysis of a rock mass such as salt in which significant time- dependent, nonlinear deformations are expected to occur. Such problems include room and canister scale studies during the excavation, operation, and long-term, post-closure stages in a salt  repository.
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4. METHOD OF SOLUTION

The numerical solution of the nonlinear incremental equilibrium equations is performed by using an explicit  Euler time-stepping scheme. The rock mass may be modeled as a viscoplastic or viscoelastic material. The viscoplastic material model can be described by a Tresca, von Mises, Drucker-Prager, or Mohr-Coulomb yield criteria (with or without strain hardening) with  an associated flow rule which can be a power or an exponential law.  The viscoelastic material model is a temperature- and stress- dependent law which has been developed by Pfeifle, Mellegard, and Senseny specifically for salt rock masses. Site-specific parameters  for this creep law at the Richton, Permian, Paradox, and Vacherie salt sites are given in the ONWI-314 report.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Mechanical and thermal properties must be isotropic; anisotropic material behavior  cannot be modeled. The rock mass medium can only be modeled as a continuum; therefore, it is impossible to model the discontinuous deformation which may occur in a heavily fractured rock mass.
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6. TYPICAL RUNNING TIME:
NESC9846/01
The longest of the test cases included in this package  ran on CDC CYBER 830 in 27 sec. of CPU time.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
NESC9846/01 15-FEB-1990 Tested at NEADB
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10. REFERENCES

- Tom W. Pfeifle, Kirby W. Mellegard, and Paul E. Senseny,
  Constitutive Properties of Salt from Four Sites,
  ONWI-314, April 1983.
NESC9846/01, included references:
- INTERA Environmental Consultants, Inc.:
  VISCOT: A Two-Dimensional and Axisymmetric Nonlinear Transient
  Thermoviscoelastic and Thermoviscoplastic Finite-Element Code for
  Modeling Time-Dependent Viscous Mechanical Behavior of a Rock Mass
  ONWI-437  (April 1983)
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11. MACHINE REQUIREMENTS:  80K words and 12 I/O units.
NESC9846/01
To run the test cases on CDC CYBER 830, 270,500 (octal) words of main storage are required.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC9846/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  NOS 1.4.
NESC9846/01
NOS.5.1. with compiler FTN4 (CDC CYBER 830).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

         M.J. Golis
         Office of Nuclear Waste Isolation
         Battelle Project Management Division
         505 King Avenue
         Columbus, Ohio 43201
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16. MATERIAL AVAILABLE
NESC9846/01
File name File description Records
NESC9846_01.001 Information file 91
NESC9846_01.002 VISCOT.FORTRAN source 3317
NESC9846_01.003 Verification test 1 input 21
NESC9846_01.004 Verification test 2 input 23
NESC9846_01.005 Verification test 3 input 99
NESC9846_01.006 Verification test 4 input (linear elem.) 32
NESC9846_01.007 Verification test 4 input (quadratic elem.) 42
NESC9846_01.008 Triaxial creep sample problem input 1 28
NESC9846_01.009 Auxiliary program 1 35
NESC9846_01.010 Data for input to auxiliary program 1 12
NESC9846_01.011 1-D non linear elastic and creep S.P. 2 inp. 32
NESC9846_01.012 Auxiliary program 2 38
NESC9846_01.013 Data for input to auxiliary program 2 36
NESC9846_01.014 Thermal shock sample problem 3 input 181
NESC9846_01.015 Auxiliary program 3 25
NESC9846_01.016 Data for input to auxiliary program 3 130
NESC9846_01.017 Input data for DOT to use S.P. 3 175
NESC9846_01.018 Verification test 1 output 530
NESC9846_01.019 Verification test 2 output 549
NESC9846_01.020 Verification test 3 output 935
NESC9846_01.021 Verification test 4 output (lin. elem.) 343
NESC9846_01.022 Verification test 4 output (quad. elem.) 1753
NESC9846_01.023 Triaxial creep sample problem 1 output 1093
NESC9846_01.024 1-D non linear elastic S.P. 2 output 3682
NESC9846_01.025 Thermal shock sample problem 3 output 1928
NESC9846_01.026 JCL and control information 66
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17. CATEGORIES
  • R. Environmental and Earth Sciences

Keywords: deformation, elasticity, finite element method, mechanical properties, nonlinear problems, plasticity, reservoir rock, rocks, salt deposits, thermal stresses, two-dimensional.