# Creep Model Group

Introduction

Creep modeling capabilities are built into 3DEC and are available as an option in FLAC2D and FLAC3D. These facilities are used to simulate the behavior of materials that exhibit creep (i.e., time-dependent material behavior). The following creep models have been implemented:

Maxwell model — A classical viscoelastic model known as the Maxwell substance.

Burgers model — A classical viscoelastic model known as the Burgers substance, composed of a Kelvin model and a Maxwell model.

Power model — A two-component power law model used for mining applications (e.g., salt or potash mining).

WIPP model — A reference creep model commonly used in thermomechanical analyses associated with studies for the underground isolation of nuclear waste in salt.

Burgers-Mohr model — A viscoplastic model combining the Burgers model and the Mohr-Coulomb model.

Power-Mohr model — A viscoplastic model combining the two-component power model and the Mohr-Coulomb model.

Power-Ubiquitous model — A viscoplastic model combining the two-component power model and the ubiquitous-joint model.

WIPP-Drucker model — A viscoplastic model combining the WIPP model and the Drucker-Prager model.

Soft-Soil-Creep model — A soft soil model considering the time-dependent secondary compression (not in 3DEC).

WIPP-Salt model — A viscoplastic model modified from the WIPP model; includes volumetric and deviatoric compaction behavior for salt-like materials.

Columnar-Basalt model — A model accounts for the presence of up to four arbitrary orientations of weakness (ubiquitous joint) in a non-isotropic elastic matrix (not in FLAC2D).

The models are presented in order of increasing complexity.

In addition, it is also possible for users to write their own creep constitutive models using the DLL user-defined models option described in Writing New Constitutive Models.

- Creep Model Group
- Solving Creep Problems
- Input Instructions for Creep Modeling
- Verification and Example Problems
- Maxwell/Kelvin/Burgers Model: Parallel-Plate Viscometer
- WIPP-Type Models: Parallel-Plate Viscometer
- Power Model: Cylindrical Cavity
- Power-Mohr Model: Cylindrical Cavity
- WIPP Model: Cylindrical Cavity
- Power Model: Spherical Cavity
- Maxwell Model: Oedometer Test
- Kelvin Model: Oedometer Test
- Maxwell/Burgers Model: Compression Test
- Burgers-Mohr/Power-Mohr Model: Loading/Unloading Compression Test
- WIPP-Drucker Model: Comparison with Drucker-Prager Model
- WIPP-Drucker Model: Compression Test Showing Localization
- WIPP-Salt Model: Hydrostatic Compression Test
- WIPP-Salt Model: Shear Compression Test
- Soft-Soil-Creep Model: Triaxial Consolidated Undrained Loading
- Columnar-Basalt Model: Unconfined Compression Test

- References

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