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Exploring a Discrete Element Approach for Chemically Mediated Deformation at Granular Contact in Calcite Minerals

Mahat, Santosh
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556909800891424

Abstract Details

2019, Master of Science, University of Toledo, Civil Engineering.
Contact dissolution and precipitation in granular materials play a critical role in the evolution of their mechanical and hydraulic properties and are pertinent to a variety of natural and anthropogenic processes. Increased human activities often result in intensified or accelerated chemo-mechanical interactions across multiple scales, such as in geological carbon dioxide storage where the presence of high-pressure carbon dioxide may dramatically alter the kinetic rates of chemical reactions, leading to enhanced dissolution and deformation in granular materials. The present work explores a numerical approach for the chemo-mechanical processes mediated by the dissolution and precipitation processes in the presence of carbon dioxide. It also explores the response of calcite minerals across multiple scales via the Discrete Element Modeling (DEM) implemented as a modeling tool. The effects of dissolution and precipitation of calcite minerals in the mechanical response are incorporated into a modified contact model at the grain contact. The kinetic rates are examined under different temperatures and different carbon dioxide pressures. The effects on the mechanical response of minerals including the changes in stress and strain rates, evolution of degradation and strengthening parameters, contact force chains and changes in stiffness are analyzed in the context of biaxial tests. The numerical results show that a multi-scale modeling approach has a strong potential for assessing the long-term performance of multi-physics processes.
Liangbo Hu (Committee Chair)
Eddie Chou (Committee Member)
Luis Mata (Committee Member)
121 p.
Civil Engineering; Geotechnology
Discrete Element Modeling, Granular Contact, Chemo-mechanical coupling

Recommended Citations

Citations

  • Mahat, S. (2019). Exploring a Discrete Element Approach for Chemically Mediated Deformation at Granular Contact in Calcite Minerals [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556909800891424

    APA Style (7th edition)

  • Mahat, Santosh. Exploring a Discrete Element Approach for Chemically Mediated Deformation at Granular Contact in Calcite Minerals. 2019. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556909800891424.

    MLA Style (8th edition)

  • Mahat, Santosh. "Exploring a Discrete Element Approach for Chemically Mediated Deformation at Granular Contact in Calcite Minerals." Master's thesis, University of Toledo, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556909800891424

    Chicago Manual of Style (17th edition)

toledo1556909800891424
402
© 2019, all rights reserved.
This open access ETD is published by University of Toledo and OhioLINK.