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Texas ScholarWorks was established to provide open, online access to the products of the University's research and scholarship, to preserve these works for future generations, to promote new models of scholarly communication, and to help deepen community understanding of the value of higher education.
UT Tower and campus image credit: Earl McGehee, CC-BY, https://www.flickr.com/photos/ejmc/7452145850
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The deformation-failure characteristics of laminated sedimentary rocks
(1964) Chenevert, Martin E.; Not available
The effect of bedding plane orientation on the elastic constants and the yield strengths of three laminated rocks, one sandstone and two shales, was studied. A fourth rock, Leuders limestone, was also studied as an example of isotropy since it had no visible evidence of bedding. This was achieved experimentally by evaluating the physical properties on one isotropic rock and three laminated rocks. The directional nature of the elastic properties of laminated rocks was evaluated by use of a triaxial compression cell and a radial-strain indicator. [...] This study suggests that laminated rocks should be treated as orthotropic rather than isotropic materials, which consequently requires an evaluation of nine elastic constants instead of the usual two. The one isotropic rock studied (Leuders limestone) showed no consistent directional variations in its elastic constants. Compressive yield strengths were determined at several states of hydrostatic stress by use of a triaxial compression cell. Leuders limestone showed no variation of yield strength with orientation. The other three rocks studied, namely the Arkansas sandstone, Green River shale, and Permian shale, showed strength reductions as high as 40% when the test specimen was cut at an angle of 20-30° to the bedding planes. The anisotropic shear failure theory (single plane of weakness theory) of Jaeger was applied to the laminated rocks tested; the Arkansas sandstone was found to follow this theory reasonably well. The Green River shale exhibited a coefficient of internal friction, which varied with the orientation of the specimen. This variation of the coefficient of internal friction was used to explain the observed strength anomalies. The tensile strengths of the three laminated rocks were determined by the indirect tension test (also called the diametral-compression test). In these tests the tensile strength for failure parallel to bedding was as much as 37% less than the strength normal to bedding. This work suggests that bedded formations exhibit sizable direction variations in both their elastic constants and yield strengths. It is therefore postulated that the concept of an orthotropic body may be a better rheological representation for these rocks insofar as continuum mechanics applications are concerned
Geopressured geothermal aquifer evaluation of the Austin Bayou prospect : Brazoria County, Texas
(1979) Chang, Ming-ming (M.S. in engineering); Knapp, R. M.
Observations of displacement processes of residual oil by aqueous surfactant solutions in extended visual flow cells
(1985) Chamblee, Christopher Jon; Caudle, Ben H. (Ben Hall), 1923-
The displacement of residual heptane by solutions of aqueous surfactant exhibiting lower, middle and upper microemulsion phase behavior were recorded on videotape. The solutions consisted of Witco TRS 10-80 and secondary butyl alcohol mixed with brines of different salinities to control and adjust phase behavior. The displacement was observed using thin section glass flow cells up to 2 feet in length filled with a consolidated cryolite grain matrix in conjunction with a color video camera and monitor. The systems were designed to address the maintenance of the structural integrity of tertiary oil banks in long visual porous models. The initial development of the oil bank varied with phase behavior. As expected, the surfactants exhibiting middle and upper phase microemulsion resulted in very efficient displacement of the residual oil. The existence of a water bank trailing the oil bank was observed in many of the displacements. The formation of the water bank is due in part, if not entirely, to resident brine which is bypassed at the oil bank's leading edge and which remains stationary until water bank encroachment. Some two phase flow in the oil bank was also observed. The sharp leading edge of the oil bank degenerated in every case, indicating an interfacial tension gradient in the bank. Evidence of slug flow is presented along with some proposed explanations for the phenomena
Mental Health of Plan II Students: An exploration of the counseling services at UT Austin
(2024-05) Gupta, Rohan
This paper examines the views Plan II Honors students have of the counseling services offered by UT Austin. The needs of this student population have not been examined. The stress these high achieving students face can drastically alter the experiences they have. Students at UT Austin turn to the Counseling and Mental Health Center (CMHC) in an effort to improve their mental health. A sample of 10 students were qualitatively interviewed for their thoughts and experiences with mental health and stress. These data were then organized according to three themes: 1. General health and wellbeing of Plan II students, 2. Barriers to using mental health services, including CMHC, and 3. Experiences and effectiveness of therapy and the counseling services at CMHC for those who have used it, and exploring the thoughts of those who have not used these resources. The data was analyzed and the most interesting findings and experiences were presented in this paper. In the discussion, limitations to the data were established, the most prevalent attempts made by CMHC and students were highlighted, and recommendations were made to improve the experiences of those using counseling services at UT Austin.
From Celebrations to Protest: The 1986 World Cup’s Reflection of Mexican Discontent
(2024-04) Guerra, Marcos Jr.
In this paper, I argue that the 1986 World Cup in Mexico was both a spectacle of national pride and a platform for public dissent. The tournament is mostly remembered by Diego Maradona’s iconic on-field performances. However, beneath the surface of these athletic achievements was a feeling of national discontent among Mexican people during a tumultuous period in Mexican history marked by economic crisis and political instability under the Institutional Revolutionary Party (PRI). While the World Cup was intended as a showcase of Mexican organizational capability and cultural richness following the oil crisis in the 1980s, it also acted to cover up the government’s failures in addressing poverty and the aftermath of the 1985 earthquake. Public protests and expressions of dissatisfaction inside and outside the stadiums reveal a society grappling with its identity and political figures. By employing Mikhail’s theory of the carnivalesque, I argue that the World Cup served as a temporary escape from social grievances, allowing expressions of joy, unity, and critique. Additionally, Paul Gillingham’s discussion on grassroots nationalism and William H. Beezley’s insights into popular nationalism offers an interpretation of the complex dynamics of the public’s actions, while often festive, also carried undertones of resistance and frustration. Through an analysis of various matches, fan interactions, and the political context, this thesis argues that the 1986 World Cup was not merely a global sports event but a critical moment of cultural and political significance that reflected and shaped the national and collective identity of Mexicans. The tournament was a platform where celebration, national pride, and disillusionment were displayed.