12 reedlunn reinvestigation into closure
TRANSCRIPT
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Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a
wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear
Security Administration under contract DE-AC04-94AL85000. SAND2016-8560 C.
Reinvestigation into Closure Predictions of Room D at the Waste Isolation Pilot Plant
Benjamin ReedlunnSandia National Laboratories
Washington, DCSeptember 7-9, 2016
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Room B and D Dimensions
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Photos of Room B and D
Room DRoom B
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In-Situ Closure Measurements
Horizontal Closure
Vertical Closure
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Triaxial Creep Tests
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Triaxial Creep Tests
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Idealized Stratigraphy
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Model Setup
Clean and Argillaceous Salt Munson-Dawson model Separate parameter sets
Anhydrite and Polyhalite Drucker-Prager model Elastic perfectly plastic Separate parameters sets
Clay Seams Coulomb friction
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Legacy Simulations
Munson, DE, Torres, TM, & Blankenship, DA. 1986. Early results from the thermal/structural in situ test series at the WIPP. In: The 27th US Symposium on Rock Mechanics (USRMS). American Rock Mechanics Association.
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Changed the Equivalent Stress
Steady State Creep Rate
Transient Creep Strain Limit
p-Plane
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Changed the Friction Coefficient
Friction coefficient treated as a free parameter
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Changed the Stratigraphy
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Changed the Material Parameters
Clean Salt Argillaceous Salt
Argillaceous transient strain limit treated as a “free parameter”.
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Legacy Predictions
Changed from von Mises to Tresca equivalent stress
Changed the clay seam friction coefficient from 0.4 to 0.2
Changed from mostly clean salt to mostly argillaceous salt
Changed the material model calibrations Argillaceous strain limit
treated as a free parameter Munson, D., Fossum, A. Senseny, P., Advances in Resolution of Discrepancies Between Predicted and Measured In Situ WIPP Room Closures, SAND88-
2948, 1988
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Legacy Predictions
Tuning of model parameters is common industry practice Tune against one in-situ measurement Compare against other in-situ measurements
Our goal is to predict solely from laboratory test data Requires a stronger scientific basis Enables predictions at a new repository
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Recreation of Legacy Simulations
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Recreation of Legacy Simulations
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Changed the Mesh
Legacy Mesh Current Fine Mesh
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Resolving the Numerics Change the Mesh
Changed Rtol = 10-3 to Rtol = 10-5
Switched to a higher quality element type
Changed the contact enforcement algorithm
Switched from non-associated flow rule to an associated flow rule for the anhydrite
Added a pressure ramp down to ease into the instantaneous excavation
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New Cores Extracted in 2013
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Clean vs. ArgillaceousSteady State Rate
Transient Limit
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New Munson-Dawson CalibrationSteady State Rate Transient Limit
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Closure Prediction with New Calibration
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List of Open Questions
Creep at low equivalent stresses
Extent of simulation boundary
Lost transient strains
Creep of argillaceous vs. clean salt
Sliding at clay seams
Anhydrite material model
Salt moisture content
Reconstruction of closure measurements
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Summary
In 1987, the simulations under-predicted the room closure by roughly 4X. In 1989, Darrell Munson adjusted the model to match the experiments.
After including the anhydrite and resolving the numerics, the predictions match the experiments.
New, laboratory based, salt calibration under-predicts the room closure by roughly 3X.
Open questions remain Creep at low equivalent stresses Extent of simulation boundary Lost transient strains Creep of argillaceous vs. clean salt Sliding at clay seams Anhydrite material model Salt moisture content Reconstruction of closure measurements