Volume Contraction in Shallow Sediments: Discrete Element Simulation
Displacements induced by mineral dissolution and subsurface volume contraction affect overlying soils. In this study, we examine the consequences of mass loss or volume contraction at shallow depths using a discrete element method. The goal of the study is to identify particle-scale and global effec...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-08-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/16/8015 |
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| author | Minsu Cha J. Carlos Santamarina |
| author_facet | Minsu Cha J. Carlos Santamarina |
| author_sort | Minsu Cha |
| collection | DOAJ |
| description | Displacements induced by mineral dissolution and subsurface volume contraction affect overlying soils. In this study, we examine the consequences of mass loss or volume contraction at shallow depths using a discrete element method. The goal of the study is to identify particle-scale and global effects as a function of the relative depth of a dissolving inclusion, initial soil density, and granular interlocking. There are successive arch formation and collapse events, and a porosity front propagates upwards as grains slide down to refill the space. Grains around and within the refilled cavity are loosely packed and have small contact forces that are sufficient to avert the buckling of granular arches that form around the dissolving zone. Denser packings and interlocking combine to exacerbate rotational frustration and lead to more pronounced force chains along granular arches, looser fill, and reduced surface settlement. In fact, surface settlement vanishes, and the sediment hides the localized dissolution when deep inclusions z/D ≥ 5 dissolve within dense sediments. While scaling relations limit the extrapolation of these numerical results to tunneling and mining applications, macroscale trends observed in the field resemble results gathered in this study. |
| first_indexed | 2024-03-09T04:44:53Z |
| format | Article |
| id | doaj.art-602de66f57c04bc19062c88633faf238 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T04:44:53Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-602de66f57c04bc19062c88633faf2382023-12-03T13:16:48ZengMDPI AGApplied Sciences2076-34172022-08-011216801510.3390/app12168015Volume Contraction in Shallow Sediments: Discrete Element SimulationMinsu Cha0J. Carlos Santamarina1Department of Civil Engineering, Jeju National University, Jeju-si 63243, KoreaEarth Science and Engineering, King Abdullah University of Science and Technology KAUST, Thuwal 23955-6900, Saudi ArabiaDisplacements induced by mineral dissolution and subsurface volume contraction affect overlying soils. In this study, we examine the consequences of mass loss or volume contraction at shallow depths using a discrete element method. The goal of the study is to identify particle-scale and global effects as a function of the relative depth of a dissolving inclusion, initial soil density, and granular interlocking. There are successive arch formation and collapse events, and a porosity front propagates upwards as grains slide down to refill the space. Grains around and within the refilled cavity are loosely packed and have small contact forces that are sufficient to avert the buckling of granular arches that form around the dissolving zone. Denser packings and interlocking combine to exacerbate rotational frustration and lead to more pronounced force chains along granular arches, looser fill, and reduced surface settlement. In fact, surface settlement vanishes, and the sediment hides the localized dissolution when deep inclusions z/D ≥ 5 dissolve within dense sediments. While scaling relations limit the extrapolation of these numerical results to tunneling and mining applications, macroscale trends observed in the field resemble results gathered in this study.https://www.mdpi.com/2076-3417/12/16/8015subsurface volume contractionmineral dissolutiongranular archingsurface settlementinternal grain displacementdiscrete element method |
| spellingShingle | Minsu Cha J. Carlos Santamarina Volume Contraction in Shallow Sediments: Discrete Element Simulation Applied Sciences subsurface volume contraction mineral dissolution granular arching surface settlement internal grain displacement discrete element method |
| title | Volume Contraction in Shallow Sediments: Discrete Element Simulation |
| title_full | Volume Contraction in Shallow Sediments: Discrete Element Simulation |
| title_fullStr | Volume Contraction in Shallow Sediments: Discrete Element Simulation |
| title_full_unstemmed | Volume Contraction in Shallow Sediments: Discrete Element Simulation |
| title_short | Volume Contraction in Shallow Sediments: Discrete Element Simulation |
| title_sort | volume contraction in shallow sediments discrete element simulation |
| topic | subsurface volume contraction mineral dissolution granular arching surface settlement internal grain displacement discrete element method |
| url | https://www.mdpi.com/2076-3417/12/16/8015 |
| work_keys_str_mv | AT minsucha volumecontractioninshallowsedimentsdiscreteelementsimulation AT jcarlossantamarina volumecontractioninshallowsedimentsdiscreteelementsimulation |