자료유형  

 학위논문

Control Number  

0017162905

International Standard Book Number  

9798384216025

Dewey Decimal Classification Number  

600

Main Entry-Personal Name  

Wood, Clay Emerson.

Publication, Distribution, etc. (Imprint  

[S.l.] : The Pennsylvania State University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

180 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-03, Section: B.

General Note  

Advisor: Marone, Chris;Shokouhi, Parisa.

Dissertation Note  

Thesis (Ph.D.)--The Pennsylvania State University, 2024.

Summary, Etc.  

요약Dynamic perturbations in the subsurface, originating from natural or industrial sources, are associated with observations of changes in poro-elastic properties that have far-ranging effects. Broadly, there are "strain-induced" and "fluid-induced" sources of these subsurface perturbations and, importantly, they produce coupled phenomenological observations. Many experimental and numerical studies that quantify elastic and hydraulic properties of rock, fractured (or ``intact'') under static stress conditions, however these measures are not necessarily indicative of their response during dynamic stress conditions. Motivated by these field observations, I use simultaneous continuous fluid flow and ultrasonic monitoring to quantify the elastic and permeability changes of natural and rough fractures. Furthermore, I incorporate measures of fracture topology and contact area to connect to the spatially variable ultrasonic monitoring and as inputs for multiphysics modeling of a single planar fracture.In this dissertation, I ask fundamental questions surrounding the connection between fracture specific stiffness and fluid transport under a range of loading conditions and dynamic stressing. Moreover, I do so by performing complex experiments under triaxial stresses and use simultaneous continuous active-source ultrasonic monitoring and fluid flux measurements to measure the static and dynamic elastic and hydraulic properties of fractures. These unique experiments are also complemented by post-surface and topography characterization using pressure registering films and profilometry.I begin this dissertation by introducing the problem statement broadly and providing some context for field-scale observations of dynamic stress-induced changes in the subsurface and lay out the limitation of linear elastic work within this context. In Chapter 2, I use ultrasonic monitoring to image the spatial and elastic variability across an in-situ fractured rock specimen and relate these to fluid flow. These experiments produced complex results which highlights the variable nature of sheared fractured rock. In Chapters 3 and 4, I extend the work of Chapter 1 by focusing on the effect of stress state on dynamic stress-induced changes in flow and elasticity. Chapter 3 demonstrates the systematic reduction in nonlinear elasticity and permeability enhancement with increasing stress state, simulating depths. I additionally relate the real contact area from pressure sensitive films to the documented elastodynamic changes. Chapter 4 leverages the experimental results from Chapter 3 and utilizes high-resolution profilometry of the tensile fracture specimen as an input for multiphysics modeling. I demonstrate that perfectly matched fracture surfaces can reproduce some of the static fluid flow properties and that misalignment is highly influential on overall poro-elastic properties. Chapter 5 represents a focused study on the relation between roughness and granular in-fill of planar fractures and their influence on elastodynamic and hydraulic changes.

Subject Added Entry-Topical Term  

Mechanical properties.

Subject Added Entry-Topical Term  

Stress state.

Subject Added Entry-Topical Term  

Heat treating.

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Fault lines.

Subject Added Entry-Topical Term  

Permeability.

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Earthquakes.

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Transmitters.

Subject Added Entry-Topical Term  

Deformation.

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Acoustics.

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Hydraulics.

Subject Added Entry-Topical Term  

Hydraulic engineering.

Subject Added Entry-Topical Term  

Mechanics.

Subject Added Entry-Topical Term  

Thermodynamics.

Added Entry-Corporate Name  

The Pennsylvania State University.

Host Item Entry  

Dissertations Abstracts International. 86-03B.

Electronic Location and Access  

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Control Number  

joongbu:655683