16,071 research outputs found
Experimental data on pore moduli of porous rock
No full textDeposited here are Excel spreadsheets containing all figure data except for figures 1 and 2. Descriptions of each file can be found in "Tarokh-Labuz-Readme.txt".These data address two key questions: (i) is Ks'' a constant and (ii) under what conditions does Ks'' = Ks hold. We present unique laboratory experiments that enable the direct measurement of Ks'', for the first time, for ideal and natural porous solids.Partial support from the MSES/Miles Kersten ChairTarokh, Ali; Labuz, Joseph F. (2018). Experimental data on pore moduli of porous rock. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/D6RX0J
Experimental data on poroelastic moduli of transversely isotropic rock
No full textDeposited here are Excel spreadsheets containing data for figures 3 to 9. Descriptions of each file can be found in Readme.txtThese data present volumetric and deviatoric poroelastic moduli from a series of drained, undrained, and unjacketed tests in uniaxial, hydrostatic, and axisymmetric compression for a porous sandstone. These data enable the direct and independent measurement of all eight parameters that fully describe the mechanical response of a transversely isotropic rock.Sponsorship: Partial support from the MSES/Miles Kersten ChairTarokh, Ali; Labuz, Joseph F. (2021). Experimental data on poroelastic moduli of transversely isotropic rock. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/s9ce-z534
Implementation of Pavement Evaluation Tools
No full textThe objective of this project was to render the Falling Weight Deflectometer (FWD) and Ground Penetrating Radar (GPR) road assessment methods accessible to field engineers through a software package with a graphical user interface. The software implements both methods more effectively by integrating the complementary nature of GPR and FWD information. For instance, the use of FWD requires prior knowledge of pavement thickness, which is obtained independently from GPR.Tang, Shuling; Guzina, Bojan; Labuz, Joseph. (2013). Implementation of Pavement Evaluation Tools. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/190127
Dr. Joseph H. Peck, author of "All about men"
No full textBlack and white photograph of Dr. Joseph H. Peck, author of "All about men," about 1958, when the book was published
Resilient Modulus and Strength cf Base Course With Recycled Bituminous Material
No full textThe objective of the research was to determine the strength and deformation characteristics of base material produced from recycled asphalt pavement (RAP) and aggregate. Various samples with different ratios of RAP and aggregate base were mixed (% RAP/aggregate): 0/100, 25/75, 50/50, 75/25. Laboratory compaction testing and field monitoring indicated that gyratory compacted specimens were closer to the densities measured in the field. Resilient modulus (MR) tests were generally conducted following the National Cooperative Highway Research Program 1-28A test protocol. MR increased with increase of confining pressure, but MR showed little change with deviator stress. The specimens with 65% optimum moisture contents were stiffer than the specimens with 100% optimum moisture contents at all confining pressures. Cyclic triaxial tests were conducted at two deviator stresses, 35% and 50% of the estimated peak stress, to evaluate recoverable and permanent deformation behavior from initial loading to 5000 cycles. The specimens with RAP exhibited at least two times greater permanent deformation than the 100% aggregate material. As %RAP increased, more permanent deformation occurred. In summary, the base material produced with various %RAP content performed at a similar level to 100% aggregate in terms of MR and strength when properly compacted.Minnesota Department of TransportationKim, Woosung; Labuz, Joseph. (2007). Resilient Modulus and Strength cf Base Course With Recycled Bituminous Material. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/5567
Data for Saturating a Tight Rock and Measuring Its Hydromechanical Response
No full textInvestigation of hydromechanical behavior of fluid-saturated tight rock is motivated by the need to quantify the effect of changes of fluid pressure p and mean stress P on rock deformation, hydrothermal fluid, and mass transport. In particular, hydromechanical properties of low porosity crystalline rock are required for analysis of geological processes including areal hydration or dehydration, mineral weathering, and fault mechanics. In this study, poroelastic parameters – drained bulk modulus K, and Biot coefficient α – governing the volumetric response of Westerly blue granite, a typical crystalline rock of low porosity are measured. Three additional hydromechanical properties, unjacketed bulk modulus Ks , expansion modulus H, and permeability k, are also measured. For the Terzaghi effective mean stress of 1.0 α > 0.38, and 20 > k > 5 nanodarcy. The agreement between poroelastic coefficients determined from various methods suggests that the underlying linear elastic assumption in Biot’s theory of poroelasticity is applicable to Westerly blue granite over small increments of effective mean stress.Research was supported by the (i) Center on Geoprocess in Mineral Carbon Storage, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under Award # DE-SC0023429 (ED, HH, JFL: synthesis; HH: analysis and interpretation of permeability tests), and (ii) J.S. Braun/Braun Intertec Visiting Chair at the Department of Civil, Environmental, and Geo- Engineering, University of Minnesota (PA: experiments, analyses).Asem, Pouyan; Detournay, Emmanuel; Huang, Haiying; Labuz, Joseph. (2023). Data for Saturating a Tight Rock and Measuring Its Hydromechanical Response. Retrieved from the Data Repository for the University of Minnesota (DRUM), https://doi.org/10.13020/1vh3-sa45
Cone Penetration Testing in Pavement Design
No full textThe objective of this work was to show that cone penetration testing (CPT) can be used for pavement applications, specifically estimating resilient modulus and organic content. A series of undisturbed samples were obtained from borings directly adjacent to CPT soundings. These samples underwent both laboratory resilient modulus and bender element testing. A statistical analysis was then performed on these results in conjunction with the data obtained from the CPT soundings to determine the feasibility of developing correlations between field and laboratory measurements of moduli. A relationship was developed between Young's modulus determined by bender element testing and that determined by resilient modulus testing. However, the correlation did not apply to the field-based seismic measurements of stiffness from the CPT soundings.
The analysis presented with respect to the identification of highly organic soils via CPT testing shows that at this point the model identified using the discriminate analysis method is not currently sufficient to use in practice. The 10% increase in correctly classified soils, however, holds promise for the future, and the introduction of additional independent parameters within a significantly larger data set can be easily analyzed using the methods and tools presented here.Minnesota Department of TransportationDehler, William; Labuz, Joseph. (2007). Cone Penetration Testing in Pavement Design. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/5590
TH 241 Column-Supported Embankment
No full textA pile-supported embankment constructed on TH 241 near St. Michael, MN was instrumented with 48 sensors, including strain gages on the piles and on the geogrid, as well as earth pressure cells and settlement systems near the base of the embankment. Pile supported embankments are relatively novel structures employed largely at bridge approaches and highway expansions where soft soils would otherwise lead to unacceptably large differential settlements. The structure typically consists of a number of capped piles, well-compacted gravel, and one or more layers of geogrid reinforcement above the piles. Analyses of the data suggest that the redistribution of the embankment load to the piles occurs within and above the so-called load transfer platform, a 1 m layer of geogridreinforced gravel. Arching seemed to take place within the embankment, such that the stress at the top of the platform was concentrated above the piles.Wachman, Gregory; Labuz, Joseph. (2008). TH 241 Column-Supported Embankment. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/96630
Inelastic Strain and Damage in Surface Instability Tests
No full textSpalling 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 parallel (axial direction) and perpendicular (lateral direction) to the free surface at various stages of loading. At a load ratio, LR = current load/peak load, of approximately 30 %, elastic deformation was measured. At 70–80 % LR, the free-face effect started to appear in the displacement contours, especially for the lateral displacement measurements. As the axial compressive stress increased close to peak, extensional lateral strain started to show concentrations associated with localized damage. Continuum damage mechanics was used to describe damage evolution in the surface instability test, and it was shown that a critical value of extensional inelastic strain, on the order of -10-3 for the virgin sandstones, may provide an indicator for determining the onset of surface spalling
Histoire Complete de Joseph
No full textThe Joseph story in Genesis was a subject of great interest to Syriac writers, and in this volume Bedjan presents the Syriac text (in vocalized East Syriac script) of a lengthy and highly praised poem on the subject, sometimes attributed to Ephrem, but more recently to the fifth-century author Balai. The poem consists of twelve homilies (memre) in the 7 + 7 meter, the subjects of which are: 1. On jealousy and the sale of Joseph, 2. Bringing his coat to his father, 3. Going down to Egypt and his sale to Potiphar, 4. His temptation, 5. His imprisonment, 6. His exaltation, 7. His brothers going down to Egypt, 8. Benjamin going down to Egypt, 9. Joseph revealing himself to his brothers, 10. News of Joseph reaching his father, 11. The death of Jacob, and 12. Joseph’s death. An appendix contains a poem on the translation of Joseph’s bones
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