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.
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Showing 1 to 20 of 62 for “"Geomechanics"”.
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Relationships between the geomechanics and petrography of ignimbrite
Fundamental petrographic controls on ignimbrite strength are examined, and those aspects of the texture and fabric of the rocks which are primarily responsible for the strength of ignimbrite identified. The range of strength exhibited by ignimbrite is quantified, and the value of common, …
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Geomechanics of injection-induced seismicity in Illinois basin
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01
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Constitutive modelling and finite element analysis in geomechanics
The major objective of the work presented in this thesis was the development of a constitutive model for hard rock at high pressure. The model should capture the important features of material behaviour and should be soundly based on mechanical principles; furthermore it should be simple enough to …
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Visualization in Geomechanics With an Application to Deep Excavations
The second part of this dissertation explores the behavior of deep excavation numerical analyses, with the aid of the visualization techniques presented herein. First, a 2D plane strain excavation analysis is explored. Second, a 3D linear excavation is modeled using a variety of excavation …
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Geomechanics and elastic anisotropy of the Bakken Formation, Williston Basin
<p>Many of the earth’s rocks exhibit anisotropic characteristics. Anisotropy is particularly common in many sedimentary rocks, such as shales. Anisotropy is defined as the spatial alignment of mineral grains, layers, fractures and stresses which causes elastic wave velocity and other elastic …
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Distict element numerical modelling of volcanic debris avalanche emplacement geomechanics.
Catastrophic collapse of volcanic edifices is a relatively common phenomenon in the geological record, representing the largest subaeriallandsliding events on Earth. Subsequent volcanic debris avalanche (VDA) runout lengths often exceed 50 km and inundated areas may be greater than 1,000 km2. The …
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Efficient algorithms for flow models coupled with geomechanics for porous media applications
… coupling between subsurface flow and reservoir geomechanics plays a critical role in obtaining accurate results for models involving reservoir deformation, surface subsidence, well stability, sand production, waste deposition, hydraulic fracturing, CO₂ sequestration, and hydrocarbon recovery. …
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Experimental, Theoretical, and Numerical Investigations of Geomechanics/Flow Coupling in Energy Georeservoirs
… for the coupled multiphysics processes of geomechanics, fluid dynamics, and the Klinkenberg effect in shales. Furthermore, A novel multi-physics multi-scale multi-porosity shale gas transport (M3ST) model was developed based on the MPST model research to investigate shale gas transport in …
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Coupled geomechanics and transient multiphase flow at fracture-matrix interface in tight reservoirs.
… forces the hydrocarbons out of the reservoirs. Geomechanics, externally applied stress on the rock, play a significant role in the oil recovery from fractured reservoirs. Subsurface fluid injection modifies pore pressure and in-situ stresses locally. In response to the pressure/stress combined …
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Application of distributed algebraic multigrid to nonlinear finite element analysis of geomechanics problems
Includes bibliographical references (pages 108-112).
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An integrated peridynamics-finite volume based multi-phase flow, geomechanics and hydraulic fracture model
Hydraulic fracturing in unconventional reservoirs exhibits several interesting phenomena including the interaction of hydraulic fractures with multi-scale heterogeneities such as natural fractures, stress/barrier layers, bedding planes, shale laminations, and mineralogy. Moreover, hydraulic …
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Application of lower bound limit analysis with second-order cone programming for plane strain and axisymmetric geomechanics problems
The present thesis illustrates the application of the lower bound limit analysis with finite elements and second-order cone programming for various geotechnical stability analyses. For the plane strain case, we firstly investigate the bearing capacity of shallow foundations on sand subjected to …
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Computational Techniques for Efficient Solution of Discretized Biot's Theory for Fluid Flow in Deformable Porous Media
… and rock mechanics, coupling effects between geomechanics field and fluid-flow field are important to understand many physical phenomena. Coupling effects in fluid-saturated porous media comes from the interaction between the geomechanics field and the fluid flow. Stresses subjected on the …
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Flow through porous media : from mixing of fluids to triggering of earthquakes
… approach to model coupled multiphase flow and geomechanics of faulted reservoirs. We represent faults as surfaces embedded in a three-dimensional medium by using zero-thickness interface elements to accurately model fault slip under dynamically evolving fluid pressure and fault strength. We …
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Compositional modeling of gas injection in tight oil reservoirs
… diffusion, and their coupling with geomechanics. Firstly, a hybrid algorithm combining the Successive Substitution and Newton's method was presented to improve the phase equilibrium calculation under confinement. Secondly, a modified formulation of the Maxwell-Stefan equation was …
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A hybrid finite element procedure for soil-structure interaction including construction sequences
… hybrid stress model, is applied to problems in geomechanics. A two-dimensional finite element procedure based on the hybrid stress model is developed for simulation of construction sequences including underground and surface excavations. In this procedure, an eight-node isoparametric element is …
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Multiphase flow and fault poromechanics : understanding earthquake triggering and seismic hazard
… tools that coupled multiphase flow and geomechanics, and apply them at the field scale using geologically realistic representations of the subsurface. In a first contribution at the scale of individual fractures, we study the impact of confining stress on the capillary pressure behavior …
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Hydraulic Fracturing and Flow-back Simulation in Unconventional Tight Reservoirs
… Then reservoir simulation coupled with rock geomechanics is employed to perform dynamic hydraulic fracturing for predicting hydraulic fracture dimensions and simulating fracturing liquid distribution. At last, Design of Experiments and response surface methodology are conducted to explore …
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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).
… field mapping methods to understand the Geomechanics mechanisms controlling rock burst prone mining blocks at Mufulira mine. Laboratory findings indicated high values of Brazilian (Tensile strength) ranging from 7 MPa to 12.1 MPa, Uniaxial Compressive Strength (UCS) ranging from 126 MPa …
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The effect of the packing density on the indentation hardness of cohesive-frictional porous materials
… to natural composites has provided the geomechanics community with a new versatile tool to test in situ phase properties and structures of geomaterials that cannot be recapitulated ex situ in bulk form. But it requires a rigorous indentation analysis to translate indentation data into …
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