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
#1Tsuyoshi Ishida (Kyoto University)H-Index: 17
#2Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
Last. Arno ZangH-Index: 25
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Acoustic emission (AE) is defined as high-frequency elastic waves emitted from defects such as small cracks (microcracks) within a material when stressed, typically in the laboratory. AE is a similar phenomenon to microseismicity (MS), as MS is induced by fracture of rock at an engineering scale (e.g., rockbursts in mines), that is, in the field. Thus, seismic monitoring can be applied to a wide variety of rock engineering problems, and AE is a powerful method to investigate processes of rock fr...
53 CitationsSource
#1Jacob Sharpe (UMN: University of Minnesota)H-Index: 1
#2Joseph F. LabuzH-Index: 32
2 Citations
#1Feitao Zeng (DUT: Dalian University of Technology)H-Index: 4
#2Ali Tarokh (UMN: University of Minnesota)H-Index: 8
Last. Joseph F. LabuzH-Index: 32
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#1Roman Y. Makhnenko (UIUC: University of Illinois at Urbana–Champaign)H-Index: 12
#2Joseph F. LabuzH-Index: 32
Localization in terms of a bifurcation from a homogeneous pattern of deformation is predicted to be different if the boundary conditions are drained or undrained. This phenomenon is evaluated in plane strain compression experiments with water-saturated Berea sandstone, where corresponding poroelastic and inelastic properties were measured. Non-uniformity of lateral deformation and clustering of acoustic emission events were used as the experimental evidence of localization, which occurred soon a...
Source
#1Joseph F. LabuzH-Index: 32
#2Roman Y. Makhnenko (UIUC: University of Illinois at Urbana–Champaign)H-Index: 12
Last. Luigi Biolzi (Polytechnic University of Milan)H-Index: 26
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1 CitationsSource
#1Roman Y. MakhnenkoH-Index: 12
#2Joseph F. LabuzH-Index: 32
#1Roman Y. Makhnenko (UMN: University of Minnesota)H-Index: 12
#2Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
In situ rock is often saturated with fluid, the presence of which affects both elastic parameters and inelastic deformation processes. Techniques were developed for testing fluid-saturated porous rock under the limiting conditions of drained (long-term), undrained (short-term) and unjacketed (solid matrix) response in hydrostatic, axisymmetric and plane-strain compression. Drained and undrained poroelastic parameters, including bulk modulus, Biot and Skempton coefficients, of Berea sandstone wer...
41 CitationsSource
#1Ali Tarokh (UMN: University of Minnesota)H-Index: 8
#2J. Peng (USTB: University of Science and Technology Beijing)
Last. Joseph F. LabuzH-Index: 32
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#1Ali Tarokh (UMN: University of Minnesota)H-Index: 8
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
view all 4 authors...
Abstract Initiation of fracture from a cylindrical opening in blocks of Berea sandstone under plane strain was monitored with a cavity expansion apparatus. Using the particle tracking technique called digital image correlation, a discontinuity in the displacement field near the cavity boundary was identified at 80% of the peak internal pressure, which meant that a process zone developed prior to peak. To investigate the effect of scaling on fracture, a two dimensional bonded particle model was v...
17 CitationsSource
Mar 25, 2016 in CPM (Combinatorial Pattern Matching)
#1Ali Tarokh (UMN: University of Minnesota)H-Index: 8
#2C. S. Kao (ExxonMobil)H-Index: 6
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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Surface spalling is a complex failure phenomenon that features crack propagation and detachment of thin pieces of rock near free surfaces, particularly in brittle rock around underground excavations when large in situ stresses are involved. A surface instability apparatus was used to study failure of rock close to a free surface, and damage evolution was monitored by digital image correlation (DIC). Lateral displacement at the free face was used as the feedback signal to control the post-peak re...
5 CitationsSource