Link to the University of Pittsburgh Homepage
Link to the University Library System Homepage Link to the Contact Us Form

Self-Organization Mechanisms within Magma Driven Dyke and Hydraulic Fracture Swarms

Gunaydin-Tulu, Delal (2022) Self-Organization Mechanisms within Magma Driven Dyke and Hydraulic Fracture Swarms. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

This is the latest version of this item.

[img] PDF
Restricted to University of Pittsburgh users only until 6 September 2024.

Download (5MB) | Request a Copy


Swarm theory offers a new approach for studying the conditions that promote the formation of natural and engineered swarms of fluid-driven fractures, such as dyke swarms and hydraulic fracture swarms. Studying their emplacement mechanisms is essential in understanding the Earth’s tectonic history, which in the future can be used as an analog to explore the similar physical processes in Venus and Mars. Self-organization, one of the most fundamental characteristics of swarming behavior, can be expressed by the emergence of a natural spacing between the swarm members due to the evidence of field measurements indicating that fracture spacing is often unusually consistent in both giant dyke swarms and engineered systems. Thus, identifying the drivers that lead to emergent spacing becomes synonymous with understanding the swarming behavior mechanisms.
This study investigates the mechanisms promoting self-organization and demonstrates how the interplay of the alignment, avoidance, and attraction forces – drivers of swarming in biological systems – leads to emergent length scales governing dyke spacing. The work is given in three parts. First, experimental confirmation of complex interaction among fluid-driven fractures is presented. The results demonstrate that fractures sometimes are suppressed by their neighbors. In other cases, with the specific non-uniform spatial distribution, their interaction results in more uniform growth. Moreover, comparisons of the experimental results to the numerical model predictions show a good agreement. Second, experimental proof of concept for emergent spacing in systems with multiple fluid-driven fractures is presented. With many narrowly spaced fractures, a geometrical pattern emerges, with every third or fourth fracture growing the most extended, resulting in an emergent spacing 3.5 - 4.5 times the fracture height. Furthermore, these experiments demonstrate a tendency for multiple fractures to grow simultaneously, overturning the hypothesis that dykes should be expected to develop one at a time. Lastly, results of laboratory experiments analog to fluid flow through specific geological configurations, such as the intersection of joints with each other and with bedding contacts, are presented. These experiments open a new model of subsurface fluid transport that explains rapid transport unable to be captured by existing models.
In summary, this study confirms that for well-aligned fluid-driven fracture swarms, when the attraction force, linked to viscous energy dissipation, is balanced with the avoidance force related to stress interaction, an optimal spacing emerges scaling with the height of fractures.


Social Networking:
Share |


Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Gunaydin-Tulu, Delaldeg90@pitt.edudeg900000-0003-0775-7471
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairBunger, Andrew P.bunger@pitt.edubunger
Committee MemberLin, Jeen-Shangjslin@pitt.edujslin
Committee MemberFascetti, Alessandrofascetti@pitt.edufascetti
Committee MemberHarbert, Williamharbert@pitt.eduharbert
Date: 6 September 2022
Date Type: Publication
Defense Date: 17 June 2022
Approval Date: 6 September 2022
Submission Date: 25 July 2022
Access Restriction: 2 year -- Restrict access to University of Pittsburgh for a period of 2 years.
Number of Pages: 138
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Civil and Environmental Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Dyke Swarms, Hydraulic Fractures, Swarm Theory, Self-Organization, Hydraulic Fracture Interaction, Mechanical Model
Date Deposited: 06 Sep 2022 16:26
Last Modified: 06 Sep 2022 16:26

Available Versions of this Item

  • Self-Organization Mechanisms within Magma Driven Dyke and Hydraulic Fracture Swarms. (deposited 06 Sep 2022 16:26) [Currently Displayed]


Monthly Views for the past 3 years

Plum Analytics

Actions (login required)

View Item View Item