All Stories

  1. Comparison of the effects of a graded interphase and a homogeneous interphase on the macroscopic properties of a particulate composite

    Article • Mathematics and Mechanics of Solids, October 2025, SAGE Publications

    Professor Robert W. Zimmerman

  2. Numerical Modeling of Tidally Driven Fractures Interacting With Meltwater Lenses on the Surface of Europa

    Article • Journal of Geophysical Research Planets, September 2025, American Geophysical Union (AGU)

    Professor Robert W. Zimmerman

  3. Dynamics of Fluid‐Driven Slip on a 3D Heterogeneous Fault With Rate‐and‐State Friction

    Article • Journal of Geophysical Research Solid Earth, July 2025, American Geophysical Union (AGU)

    Professor Robert W. Zimmerman

  4. A robust 3D finite element framework for monolithically coupled thermo-hydro-mechanical analysis of fracture growth with frictional contact in porous media

    Article • Computer Methods in Applied Mechanics and Engineering, February 2025, Elsevier

    Professor Robert W. Zimmerman

  5. How to identify the S-wave arrival in ultrasonic propagation tests using simulations?

    Article • Geophysics, January 2024, Society of Exploration Geophysicists

    Professor Robert W. Zimmerman, Alvin Biyoghe

  6. Semi-analytical Method for Modeling Wellbore Breakout Development

    Article • Rock Mechanics and Rock Engineering, May 2022, Springer Science + Business Media

    Professor Robert W. Zimmerman

  7. Fracture growth leading to mechanical spalling around deposition boreholes of an underground nuclear waste repository

    Article • International Journal of Rock Mechanics and Mining Sciences, April 2022, Elsevier

    Professor Robert W. Zimmerman

  8. One-Dimensional Flow to a Constant-Pressure Boundary in a Pressure-Sensitive Porous Medium

    Article • December 2021, Wiley

    Professor Robert W. Zimmerman

  9. The effect of pore shape on the Poisson ratio of porous materials

    Article • Mathematics and Mechanics of Solids, June 2021, SAGE Publications

    Professor Robert W. Zimmerman

  10. Perturbation Solution for One-Dimensional Flow to a Constant-Pressure Boundary in a Stress-Sensitive Reservoir

    Article • Transport in Porous Media, March 2021, Springer Science + Business Media

    Professor Robert W. Zimmerman

  11. Gravity Hydraulic Fracturing: A Method to Create Self‐driven Fractures

    Article • Geophysical Research Letters, September 2020, American Geophysical Union (AGU)

    Professor Robert W. Zimmerman

  12. A unified methodology for computing the stresses around an arbitrarily-shaped hole in isotropic or anisotropic materials

    Article • International Journal of Solids and Structures, August 2020, Elsevier

    Professor Robert W. Zimmerman

  13. Permeability of three-dimensional numerically grown geomechanical discrete fracture networks with evolving geometry and mechanical apertures

    Article • Journal of Geophysical Research Solid Earth, March 2020, American Geophysical Union (AGU)

    Professor Robert W. Zimmerman

  14. Relationship between the orientation of maximum permeability and intermediate principal stress in fractured rocks

    Article • Water Resources Research, October 2018, American Geophysical Union (AGU)

    Professor Robert W. Zimmerman

  15. Permeability of observed three dimensional fracture networks in spent fuel pins

    Article • Journal of Nuclear Materials, August 2018, Elsevier

    Professor Robert W. Zimmerman

  16. Effect of cold CO 2 injection on fracture apertures and growth

    Article • International Journal of Greenhouse Gas Control, July 2018, Elsevier

    Professor Robert W. Zimmerman

  17. Commemorating Dr. Gudmundur “Bo” Bodvarsson (1951–2006), a Leader of the Deep Unsaturated Flow and Transport Investigations

    Article • Water, December 2017, MDPI AG

    Professor Robert W. Zimmerman

  18. Quantification of Fracture Interaction Using Stress Intensity Factor Variation Maps

    Article • Journal of Geophysical Research Solid Earth, October 2017, Wiley

    Professor Robert W. Zimmerman

  19. Three-Dimensional Poroelastic Effects during Hydraulic Fracturing in Permeable Rocks

    Article • International Journal of Solids and Structures, December 2016, Elsevier

    Professor Robert W. Zimmerman

  20. Evolution of fracture normal stiffness due to pressure dissolution and precipitation

    Article • International Journal of Rock Mechanics and Mining Sciences, October 2016, Elsevier

    Professor Robert W. Zimmerman

  21. A finite element framework for modeling internal frictional contact in three-dimensional fractured media using unstructured tetrahedral meshes

    Article • Computer Methods in Applied Mechanics and Engineering, July 2016, Elsevier

    Professor Robert W. Zimmerman

  22. Inclusion-Based Effective Medium Models for the Permeability of a 3D Fractured Rock Mass

    Article • Transport in Porous Media, April 2016, Springer Science + Business Media

    Professor Robert W. Zimmerman

  23. A direct fragmentation method with Weibull function distribution of sizes based on finite- and discrete element simulations

    Article • International Journal of Solids and Structures, February 2016, Elsevier

    Professor Robert W. Zimmerman

  24. Effect of the interphase zone on the conductivity or diffusivity of a particulate composite using Maxwell’s homogenization method

    Article • International Journal of Engineering Science, January 2016, Elsevier

    Professor Robert W. Zimmerman

  25. A disk-shaped domain integral method for the computation of stress intensity factors using tetrahedral meshes

    Article • International Journal of Solids and Structures, September 2015, Elsevier

    Professor Robert W. Zimmerman

  26. On the use of quarter-point tetrahedral finite elements in linear elastic fracture mechanics

    Article • Engineering Fracture Mechanics, August 2015, Elsevier

    Professor Robert W. Zimmerman

  27. Hydraulic sealing due to pressure solution contact zone growth in siliciclastic rock fractures

    Article • Journal of Geophysical Research Solid Earth, June 2015, American Geophysical Union (AGU)

    Professor Robert W. Zimmerman

  28. Modification of Griffith–McClintock–Walsh model for crack growth under compression to incorporate stick-slip along the crack faces

    Article • International Journal of Rock Mechanics and Mining Sciences, December 2014, Elsevier

    Professor Robert W. Zimmerman

  29. An impulse-based energy tracking method for collision resolution

    Article • Computer Methods in Applied Mechanics and Engineering, August 2014, Elsevier

    Dr Adriana Paluszny, Professor Robert W. Zimmerman

  30. Permeability tensor of three‐dimensional fractured porous rock and a comparison to trace map predictions

    Article • Journal of Geophysical Research Solid Earth, August 2014, American Geophysical Union (AGU)

    Dr Adriana Paluszny, Professor Robert W. Zimmerman

  31. Validity of linear elasticity in the crack-tip region of ideal brittle solids

    Article • International Journal of Fracture, July 2014, Springer Science + Business Media

    Professor Robert W. Zimmerman

  32. Laboratory measurements of low- and high-frequency elastic moduli in Fontainebleau sandstone

    Article • Geophysics, September 2013, Society of Exploration Geophysicists

    Professor Robert W. Zimmerman

  33. Numerical fracture growth modeling using smooth surface geometric deformation

    Article • Engineering Fracture Mechanics, August 2013, Elsevier

    Dr Adriana Paluszny, Professor Robert W. Zimmerman

  34. Energy conservative property of impulse‐based methods for collision resolution

    Article • International Journal for Numerical Methods in Engineering, June 2013, Wiley

    Dr Adriana Paluszny, Professor Robert W. Zimmerman

  35. Model for Frequency-Dependence of Elastic Wave Velocities in Porous Rocks

    Article • June 2013, American Society of Civil Engineers (ASCE)

    Professor Robert W. Zimmerman

  36. Fracture and impulse based finite-discrete element modeling of fragmentation

    Article • Computational Mechanics, May 2013, Springer Science + Business Media

    Dr Adriana Paluszny, Professor Robert W. Zimmerman

  37. Impact of stress on solute transport in a fracture network: A comparison study

    Article • Journal of Rock Mechanics and Geotechnical Engineering, April 2013, Elsevier

    Professor Robert W. Zimmerman

  38. Comparison of discrete fracture network and equivalent continuum simulations of fluid flow through two-dimensional fracture networks for the DECOVALEX–2011 project

    Article • Mineralogical Magazine, December 2012, Mineralogical Society

    Professor Robert W. Zimmerman

  39. Pore structure model for elastic wave velocities in fluid-saturated sandstones

    Article • Journal of Geophysical Research Atmospheres, July 2012, American Geophysical Union (AGU)

    Professor Robert W. Zimmerman

  40. Sliding crack model for nonlinearity and hysteresis in the uniaxial stress–strain curve of rock

    Article • International Journal of Rock Mechanics and Mining Sciences, June 2012, Elsevier

    Professor Robert W. Zimmerman

  41. Estimating the Hydraulic Conductivity of Two-Dimensional Fracture Networks Using Network Geometric Properties

    Article • Transport in Porous Media, March 2012, Springer Science + Business Media

    Professor Robert W. Zimmerman

  42. Estimating the permeability of cement pastes and mortars using image analysis and effective medium theory

    Article • Cement and Concrete Research, February 2012, Elsevier

    Professor Robert W. Zimmerman

  43. Effect of entrained air voids on the microstructure and mass transport properties of concrete

    Article • Cement and Concrete Research, October 2011, Elsevier

    Professor Robert W. Zimmerman

  44. Elastic moduli of solids containing spheroidal pores

    Article • International Journal of Engineering Science, July 2011, Elsevier

    Professor Robert W. Zimmerman

  45. Pressure Buildup During CO2 Injection into a Closed Brine Aquifer

    Article • Transport in Porous Media, May 2011, Springer Science + Business Media

    Professor Robert W. Zimmerman

  46. Compressibility and shear compliance of spheroidal pores: Exact derivation via the Eshelby tensor, and asymptotic expressions in limiting cases

    Article • International Journal of Solids and Structures, March 2011, Elsevier

    Professor Robert W. Zimmerman

  47. Numerical simulation of multiple 3D fracture propagation using arbitrary meshes

    Article • Computer Methods in Applied Mechanics and Engineering, February 2011, Elsevier

    Dr Adriana Paluszny, Professor Robert W. Zimmerman

  48. 10.1029/90WR01418

    Article • Water Resources Research, July 2010, CrossRef Test Account

    Professor Robert W. Zimmerman

  49. A fully coupled thermo-hydro-mechanical model for simulating multiphase flow, deformation and heat transfer in buffer material and rock masses

    Article • International Journal of Rock Mechanics and Mining Sciences, February 2010, Elsevier

    Professor Robert W. Zimmerman

  50. Erratum to “Screening and selection of sites for CO2 sequestration based on pressure buildup” [Int. J. Greenhouse Gas Control 3 (5) (2009) 577–585]

    Article • International Journal of Greenhouse Gas Control, January 2010, Elsevier

    Professor Robert W. Zimmerman

  51. An effective thermal conductivity model of geological porous media for coupled thermo-hydro-mechanical systems with multiphase flow

    Article • International Journal of Rock Mechanics and Mining Sciences, December 2009, Elsevier

    Professor Robert W. Zimmerman

  52. A new well path optimization model for increased mechanical borehole stability

    Article • Journal of Petroleum Science and Engineering, November 2009, Elsevier

    Professor Robert W. Zimmerman

  53. Influence of the interfacial transition zone and microcracking on the diffusivity, permeability and sorptivity of cement-based materials after drying

    Article • Magazine of Concrete Research, October 2009, ICE Publishing

    Professor Robert W. Zimmerman

  54. Screening and selection of sites for CO2 sequestration based on pressure buildup

    Article • International Journal of Greenhouse Gas Control, September 2009, Elsevier

    Professor Robert W. Zimmerman

  55. Approximate Solutions for Pressure Buildup During CO2 Injection in Brine Aquifers

    Article • Transport in Porous Media, December 2008, Springer Science + Business Media

    Professor Robert W. Zimmerman

  56. Shear compliance of two-dimensional pores possessing N-fold axis of rotational symmetry

    Article • Proceedings of the Royal Society A Mathematical Physical and Engineering Sciences, March 2008, Royal Society Publishing

    Professor Robert W. Zimmerman

  57. Assessing the effect of geological uncertainty on recovery estimates in shallow-marine reservoirs: the application of reservoir engineering to the SAIGUP project

    Article • Petroleum Geoscience, February 2008, Geological Society

    Professor Robert W. Zimmerman

  58. Sensitivity of the impact of geological uncertainty on production from faulted and unfaulted shallow-marine oil reservoirs: objectives and methods

    Article • Petroleum Geoscience, February 2008, Geological Society

    Professor Robert W. Zimmerman

  59. Boundary Perturbation Solution for Nearly Circular Holes and Rigid Inclusions in an Infinite Elastic Medium

    Article • Journal of Applied Mechanics, January 2008, ASME International

    Professor Robert W. Zimmerman

  60. Influence of volume/mass on grain-size curves and conversion of image-analysis size to sieve size

    Article • Engineering Geology, March 2007, Elsevier

    Professor Robert W. Zimmerman

  61. Stability analysis of vertical boreholes using the Mogi–Coulomb failure criterion

    Article • International Journal of Rock Mechanics and Mining Sciences, December 2006, Elsevier

    Professor Robert W. Zimmerman

  62. Pore-scale modelling of NMR relaxation for the characterization of wettability

    Article • Journal of Petroleum Science and Engineering, June 2006, Elsevier

    Professor Robert W. Zimmerman

  63. Compressibility of two-dimensional pores having n-fold axes of symmetry

    Article • Proceedings of the Royal Society A Mathematical Physical and Engineering Sciences, February 2006, Royal Society Publishing

    Professor Robert W. Zimmerman

  64. Heat transfer to air–water annular flow in a horizontal pipe

    Article • International Journal of Multiphase Flow, January 2006, Elsevier

    Professor Robert W. Zimmerman

  65. Preface

    Article • International Journal of Rock Mechanics and Mining Sciences, October 2005, Elsevier

    Professor Robert W. Zimmerman

  66. Analysis of counter-current imbibition with gravity in weakly water-wet systems

    Article • Journal of Petroleum Science and Engineering, July 2005, Elsevier

    Professor Robert W. Zimmerman

  67. Relation between the Mogi and the Coulomb failure criteria

    Article • International Journal of Rock Mechanics and Mining Sciences, April 2005, Elsevier

    Professor Robert W. Zimmerman

  68. Effect of an inhomogeneous interphase zone on the bulk modulus and conductivity of a particulate composite

    Article • International Journal of Solids and Structures, January 2005, Elsevier

    Professor Robert W. Zimmerman

  69. Analytic Analysis for Oil Recovery During Counter-Current Imbibition in Strongly Water-Wet Systems

    Article • Transport in Porous Media, January 2005, Springer Science + Business Media

    Professor Robert W. Zimmerman

  70. Navier-stokes simulations of fluid flow through a rock fracture

    Article • January 2005, Wiley

    Professor Robert W. Zimmerman

  71. Polymers as relative permeability modifiers: adsorption and the dynamic formation of thick polyacrylamide layers

    Article • Journal of Petroleum Science and Engineering, December 2004, Elsevier

    Professor Robert W. Zimmerman

  72. Non-linear regimes of fluid flow in rock fractures

    Article • International Journal of Rock Mechanics and Mining Sciences, May 2004, Elsevier

    Professor Robert W. Zimmerman

  73. Effective stress law for the permeability of clay-rich sandstones

    Article • Journal of Geophysical Research Atmospheres, April 2004, American Geophysical Union (AGU)

    Professor Robert W. Zimmerman

  74. Chapter 7 Hydromechanical Behavior of Fractured Rocks

    Article • January 2003, Elsevier

    Professor Robert W. Zimmerman

  75. Predicting the permeability of sandstone from image analysis of pore structure

    Article • Journal of Applied Physics, November 2002, American Institute of Physics

    Professor Robert W. Zimmerman

  76. Segregated pathways mechanism for oil and water flow through an oil-based gelant

    Article • Journal of Petroleum Science and Engineering, August 2002, Elsevier

    Professor Robert W. Zimmerman

  77. Flow of Water through Channels Filled with Deformable Polymer Gels

    Article • Journal of Colloid and Interface Science, June 2002, Elsevier

    Professor Ann H Muggeridge, Professor Robert W. Zimmerman

  78. Wettability alteration by aging of a gel placed within a porous medium

    Article • Journal of Petroleum Science and Engineering, April 2002, Elsevier

    Professor Robert W. Zimmerman

  79. Creeping Flow Through an Axisymmetric Sudden Contraction or Expansion

    Article • Journal of Fluids Engineering, January 2002, ASME International

    Professor Robert W. Zimmerman

  80. Creeping flow through a pipe of varying radius

    Article • Physics of Fluids, October 2001, American Institute of Physics

    Professor Robert W. Zimmerman

  81. Rheology and Permeability of Crosslinked Polyacrylamide Gel

    Article • Journal of Colloid and Interface Science, August 2001, Elsevier

    Professor Ann H Muggeridge, Professor Robert W. Zimmerman

  82. Article • Transport in Porous Media, January 2001, Springer Science + Business Media

    Professor Robert W. Zimmerman

  83. Article • Transport in Porous Media, January 2001, Springer Science + Business Media

    Professor Robert W. Zimmerman

  84. A Model for Steady Laminar Flow through a Deformable Gel-Coated Channel

    Article • Journal of Colloid and Interface Science, June 2000, Elsevier

    Professor Ann H Muggeridge, Professor Robert W. Zimmerman

  85. Effect of stress on the hydraulic conductivity of rock pores

    Article • Physics and Chemistry of the Earth Part A Solid Earth and Geodesy, January 2000, Elsevier

    Professor Robert W. Zimmerman

  86. A new lumped-parameter model for flow in unsaturated dual-porosity media

    Article • Advances in Water Resources, October 1996, Elsevier

    Professor Robert W. Zimmerman

  87. Effective block size for imbibition or absorption in dual-porosity media

    Article • Geophysical Research Letters, June 1995, American Geophysical Union (AGU)

    Professor Robert W. Zimmerman

  88. Coupled reservoir-wellbore simulation of geothermal reservoir behavior

    Article • Geothermics, April 1995, Elsevier

    Professor Robert W. Zimmerman

  89. Grain and void compression in fractured and porous rocks

    Article • International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, April 1994, Elsevier

    Professor Robert W. Zimmerman

  90. A numerical dual-porosity model with semianalytical treatment of fracture/matrix flow

    Article • Water Resources Research, July 1993, American Geophysical Union (AGU)

    Professor Robert W. Zimmerman

  91. The effect of contact area on the permeability of fractures

    Article • Journal of Hydrology, November 1992, Elsevier

    Professor Robert W. Zimmerman

  92. Hashin-Shtrikman bounds on the poisson ratio of a composite material

    Article • Mechanics Research Communications, November 1992, Elsevier

    Professor Robert W. Zimmerman

  93. Elastic moduli of a solid containing spherical inclusions

    Article • Mechanics of Materials, August 1991, Elsevier

    Professor Robert W. Zimmerman

  94. Reply [to “Comment on ‘An Approximate Solution for One-Dimensional Absorption in Unsaturated Porous Media’ by R. W. Zimmerman and G. S. Bodvarsson”]

    Article • Water Resources Research, August 1991, American Geophysical Union (AGU)

    Professor Robert W. Zimmerman

  95. Lubrication theory analysis of the permeability of rough-walled fractures

    Article • International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, July 1991, Elsevier

    Professor Robert W. Zimmerman

  96. Permeability of a fracture with cylindrical asperities

    Article • Fluid Dynamics Research, June 1991, Institute of Physics Publishing

    Professor Robert W. Zimmerman

  97. A simple approximate solution for horizontal infiltration in a Brooks-Corey medium

    Article • Transport in Porous Media, April 1991, Springer Science + Business Media

    Professor Robert W. Zimmerman

  98. Comment and Reply on "Application of linear elastic fracture mechanics to the quantitative evaluation of fluid-inclusion decrepitation"

    Article • Geology, January 1991, Geological Society of America

    Professor Robert W. Zimmerman

  99. Thermal conductivity of fluid-saturated rocks

    Article • Journal of Petroleum Science and Engineering, November 1989, Elsevier

    Professor Robert W. Zimmerman

  100. Integral method solution for diffusion into a spherical block

    Article • Journal of Hydrology, January 1989, Elsevier

    Professor Robert W. Zimmerman

  101. Stress singularity around two nearby holes

    Article • Mechanics Research Communications, March 1988, Elsevier

    Professor Robert W. Zimmerman

  102. Second-Order Approximation for the Compression of an Elastic Plate Containing a Pair of Circular Holes

    Article • ZAMM ‐ Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, January 1988, Wiley

    Professor Robert W. Zimmerman

  103. The elastic moduli of mortar as a porous-granular material

    Article • Cement and Concrete Research, March 1986, Elsevier

    Professor Robert W. Zimmerman

  104. The Effects of Pore Pressure and Confining Pressure on Pore and Bulk Volume Compressibilities of Consolidated Sandstones

    Article • January 1985, ASTM International

    Professor Robert W. Zimmerman

  105. Elastic moduli of a solid with spherical pores: New self-consistent method

    Article • International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, December 1984, Elsevier

    Professor Robert W. Zimmerman

  106. Analytic Analysis for Oil Recovery During Counter-Current Imbibition in Strongly Water-Wet Systems

    Article • Springer Science + Business Media

    Professor Robert W. Zimmerman