NESC9846 VISCOT.
VISCOT, Viscous Mechanical Behaviour of Rock Mass Under Thermal Stress
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES
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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.
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.
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.
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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NESC9846/01
The longest of the test cases included in this package ran on CDC CYBER 830 in 27 sec. of CPU time.[ top ]
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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.
- 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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NESC9846/01
To run the test cases on CDC CYBER 830, 270,500 (octal) words of main storage are required.[ top ]
NESC9846/01
NOS.5.1. with compiler FTN4 (CDC CYBER 830).[ top ]
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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 |
Keywords: deformation, elasticity, finite element method, mechanical properties, nonlinear problems, plasticity, reservoir rock, rocks, salt deposits, thermal stresses, two-dimensional.