Joseph F. Labuz
University of Minnesota
Ultimate tensile strengthDigital image correlationGeologyEngineeringBrittlenessComposite materialAcoustic emissionGeotechnical engineeringMaterials scienceStiffnessSofteningPlane stressLateral earth pressureFracture (geology)MechanicsFracture mechanicsStructural engineeringStress (mechanics)Shear (geology)Rock mechanics
190Publications
32H-index
3,135Citations
Publications 189
Newest
#1Ashok K. Chugh (USBR: United States Bureau of Reclamation)H-Index: 7
#2Joseph F. LabuzH-Index: 32
Last. C. Guney Olgun (VT: Virginia Tech)H-Index: 15
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Structural stiffness of a retaining wall, properties of the foundation soils, and the construction sequence, including order of placement of fill in front and back of the wall, affect movements and hence the development of active and passive earth pressures. Retaining walls considered in this paper are the traditional reinforced concrete type usually constructed along highways and dam spillway structures – the highway wall is a simple cantilever and the spillway wall in an earth dam is a counter...
2 CitationsSource
#1C. S. Kao (ExxonMobil)H-Index: 6
#2Ali Tarokh (UMN: University of Minnesota)H-Index: 8
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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Spalling near a free surface in laboratory experiments on two sandstones was characterized using acoustic emission and digital image correlation. A surface instability apparatus was used to reproduce a state of plane strain near a free surface in a modeled semi-infinite medium subjected to far-field compressive stress. Comparison between AE locations and crack trajectory mapped after the test showed good consistency. Digital image correlation was used to find the displacements in directions para...
6 CitationsSource
#1Ali Tarokh (UMN: University of Minnesota)H-Index: 8
#2C. S. Kao (ExxonMobil)H-Index: 6
Last. Joseph F. LabuzH-Index: 32
view all 4 authors...
Failure of rock close to a free surface is reproduced in laboratory tests on two types of sandstone. Digital image correlation is used to study the in-plane displacement fields prior to and during the successive formation of surface-parallel fractures. The axial and lateral displacements suggest that the displacement gradient is uniform in both directions at early loading stages; as the axial load increases, the free-face effect starts to influence the displacement contours, especially the later...
6 CitationsSource
#1Joseph F. LabuzH-Index: 32
#2Roman Y. Makhnenko (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 12
Last. J. T. Harvieux (Stanford University)H-Index: 1
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2 Citations
#1Ali Tarokh (UMN: University of Minnesota)H-Index: 8
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
view all 4 authors...
#1Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
#2Emmanuel M Detournay (UMN: University of Minnesota)H-Index: 60
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This special issue of Rock Mechanics and Rock Engineering contains ten papers and two technical notes that were invited contributions from the 48th US Rock Mechanics/Geomechanics Symposium held at the University of Minnesota, MN, June 1–4, 2014. The symposium is the focal event of the American Rock Mechanics Association (ARMA), and the manuscripts in this special issue are revised and expanded versions of the proceedings papers. The theme of the symposium was Rock Mechanics Across Length and Tim...
Source
#1Roman Y. Makhnenko (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 12
#2Justice Harvieux (UMN: University of Minnesota)H-Index: 1
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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The Paul-Mohr-Coulomb failure criterion includes the intermediate principal stress sigma(II) and friction angles at the limiting stress states of sigma(II)= sigma(III) and sigma(II) = sigma(I), where sigma(I) and sigma(III) are major and minor principal stresses. Conventional triaxial compression (sigma(II) = sigma(III)), extension (sigma(II) = sigma(I)), and plane strain (sigma(I) not equal sigma(II) not equal sigma(III)) experiments were performed on dry rock. The failure data were plotted in ...
16 CitationsSource
#1Dmitry Nikolskiy (UMN: University of Minnesota)H-Index: 5
#2Sofia G. Mogilevskaya (UMN: University of Minnesota)H-Index: 23
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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Abstract This paper reports new developments on the complex variables boundary element approach for solving three-dimensional problems of cracks in elastic media. These developments include implementation of higher order polynomial approximations for the boundary displacement discontinuities and more efficient analytical techniques for evaluation of integrals. The approach employs planar triangular boundary elements and is based on the integral representations written in a local coordinate syste...
8 CitationsSource
#1Roman Y. Makhnenko (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 12
#2Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
The presence of pore fluid in rock affects both the elastic and inelastic deformation processes, yet laboratory testing is typically performed on dry material even though in situ the rock is often saturated. Techniques were developed for testing fluid-saturated porous rock under the limiting conditions of drained, undrained, and unjacketed response. Confined compression experiments, both conventional triaxial and plane strain, were performed on water-saturated Berea sandstone to investigate poro...
17 CitationsSource
#1Jia Liang LeH-Index: 18
#2Jonathan Manning (UMN: University of Minnesota)H-Index: 1
Last. Joseph F. LabuzH-Index: 32
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Abstract This paper presents a comprehensive set of size effect experiments on fatigue crack kinetics for Berea sandstone. It is observed that for all specimens the Paris-Erdogan law is applicable for a wide range of amplitudes of the stress intensity factor. The fatigue tests also indicate that there is a small-crack growth regime at the beginning stage of cyclic loading, where the growth rate decreases as the crack initiates from the notch tip. It is shown that the fracture kinetics for both t...
44 CitationsSource