Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 23 for “"jointing"”.
-
Processes of Progressive Deformation with Applications to Jointing, Faulting and Fluid Flow
The study of progressive deformation of fracture mechanical processes in earth and planetary sciences is applicable to all fracturing modes (opening-, sliding-, tearing-, and closing modes) and provides insight into evolution and behavior of fracturing on all scales. Hence, studying such processes …
-
The application of knowledge based systems to the abstraction of design and costing rules in bespoke pipe jointing systems
… the design and cost estimation of bespoke pipe jointing systems. An overview of the problem domain is provided and the findings from a literature review on knowledge based systems and applications in manufacturing were used to provide initial guidance to the research. The overall investigation …
-
Characterising subaerial basaltic ‘a‘ā lava flows as potential geothermal reservoirs: Nordeste volcanic complex, Volcanic, São Miguel, Azores
… cavities, drainage cavities and fractures or jointing associated with cooling or vesiculation each provide the sequences with a degree of porosity, influencing the overall porosity and permeability of the entire sequence. <br/><br/>The vesicles and fracture networks found within the cores and …
-
Use of herbicides, tillage, and grazing cattle for establishment of corn in rotation with alfalfa and rye
… 4) treatment 3 plus grazing prior to rye jointing, and 5) alfalfa grazing plus autumn application of glyphosate, 6) alfalfa grazing plus autumn disking (no herbicides). Grazing until corn planting decreased (P<0.05) alfalfa stands and rye biomass, but increased (P<0.05) corn plant …
-
Growth analysis and regrowth potential of three cool season grasses in spring
… when the accumulating canopies were cut prior to jointing than when cut later in all grasses. This suggests that utilizing forages prior to jointing will produce a good aftermath growth and persistence. The response of stubble LAI in cool environment to produce heavier tillers shows that frequent …
-
Relationships between the geomechanics and petrography of ignimbrite
… where appropriate. Models for the strength, jointing, and geomorphic development of an ignimbrite sheet are derived. Compressive, shear, and tensile strengths, measured by using standard techniques, provide the basic geomechanical data; strength indices (density, porosity, rebound hardness, …
-
Modeling joint patterns using combinations of mechanical and probabilistic concepts
… within a competent layer bounded by ductile non-jointing layers. Field and laboratory studies in the literature suggest that their spacing is related to layer thickness and follows some probability distribution. Laboratory results in the literature also suggest that for a given layer thickness, a …
-
A structural and geochemical traverse across the NW outcrop of the Colenso Fault Zone, Saldanha, South Africa
… strike-slip shearing and finally late stage jointing. The Colenso Fault Zone is host to 3 large zones of cataclasis that are in the order of up to a few hundred metres in exposed down-dip and along-strike lengths. The cataclasites are composed of quartz and plagioclase clasts, in a …
-
Structural diagenesis of bed-parallel and bed-normal fractures, Cretaceous Crato Formation carbonate rocks, NE Brazil
… increasing overburden related to burial, next by jointing caused by decreasing overburden related to uplift and finally by dissolution along joint walls. Porosity was reduced by cementation of fractures, both during and after opening, and later enhanced by dissolution of cements and included host …
-
Latest Cenozoic stratigraphy of Lake Sakakawea area, northeast Mercer County, North Dakota
… the area. The lithologic homogeneity, columnar jointing, and a weathering profile characterize the upper member.</p> <p>The Coteau Formation is mainly alluvium and slopewash sediment. It is found at the base of steep hillslopes. Much of it was deposited during unstable (warm and dry) climatic …
-
Numerical Modeling Methodology for Weak Rock Masses in Nevada gold mines
… to take into consideration the effect of jointing using discrete fracture network (DFN) and rock bolts in 3DEC. Sensitivity studies were performed on over 200 time dependent numerical models to understand the effect of various rock support design parameters on different excavation sizes …
-
The mechanical behaviour of polyethylene pipe systems
… at a defect residual from processing or jointing. Over 95% of all small diameter pipe fractures originated from inclusions at or close to the inside wall. They were geometrically and elementally analysed and suggestions made as to their possible origin and means of elimination. For one PE …
-
Development of an early warning system for predicting rock bursts and rock induced displacements in seismically active mining blocks at Mufulira underground mine (deeps section).
… and geological parameters such as rock types, jointing and fracturing.
-
Caracterización del proceso de soldadura por puntos por fricción agitación empleando el análisis de señales vibroacústicas
… end of the last century, in 1991, a new metal jointing process emerged, the welding by friction – agitation, Friction Stir Welding (FSW) This innovative process was created due to the necessity of making welded unions which were impossible to obtain by conventional fusion welding techniques, as …
-
Speleogenesis in Comal County, Texas
… such as stratigraphic variation, topography, jointing, and ground-water flow. In the light of these data, a new classification of caves is proposed based upon the mode of water flow involved in their formation. Influent caves are formed by water flowing from the surface to the ground-water …
-
The structure of epithermal deposits of the Coromandel Peninsula : dynamic processes and three-dimensional strain
… pre-existing planar features, including columnar jointing, is important, with veins often following their precursors. The main processes which influence vein patterns and shapes are shearing (pre, syn, alternating with and post vein opening), oblique opening ('shear opening') and perpendicular …
-
The structural and engineering geology of the Country Rock at Finsch Mine
… During transpression the fault-parallel jointing/cleavage is fanned by fault-parallel folds and a conjugate set of joints form as a result of WSW directed crustal shortening. Extensive line sampling of the rock discontinuities (joints) was undertaken. The characteristics of the joints …
-
Erosion of fractured banks, Lake Sakakawea, western North Dakota
… are sealed with mineral coatings. A columnar jointing pattern in the Upper Snow School and Upper Horseshoe Valley tills results from dominance of orthogonal sets of open vertical fractures with rough surfaces and the absence of horizontal structures. </p><p> The most important failure …
-
Assessment of geotechnical considerations for ground control and stability at Nkana Synclinorium copper mine Mopani Plc, Zambia.
… meters of the tunnels. Geological factors like jointing, weathering and shearing as well as drill-and-blast challenges were attributed to over-break and under-break. In conclusion, folds and joints are major factors affecting ground and stability at Synclinorium mine, and the geotechnical …
-
Assessment of geotechnical considerations for ground control and stability at Nkana Synclinorium copper mine Mopani Plc, Zambia.
… meters of the tunnels. Geological factors like jointing, weathering and shearing as well as drill-and-blast challenges were attributed to over-break and under-break. In conclusion, folds and joints are major factors affecting ground and stability at Synclinorium mine, and the geotechnical …
Page 1 of 2