Details
| Original language | English |
|---|---|
| Pages (from-to) | 3-18 |
| Number of pages | 16 |
| Journal | Soil and Tillage Research |
| Volume | 111 |
| Issue number | 1 |
| Publication status | Published - Dec 2010 |
| Externally published | Yes |
Abstract
Soil deformation is a perpetual process in the pedosphere where besides physicochemical stresses primarily alternating hydraulic and mechanical stresses continuously re-arrange the configuration of solid particles. In this study we present a local strain analysis and changes in soil structure resulting from hydraulic and mechanical stresses based on X-ray microtomography data. Digital image reconstructions were used to quantify local structural pore space characteristics and local soil deformation by 3D morphological and correlation analysis of grayscale tomograms. Swelling and shrinkage resulted in a complex heterogeneous soil structure which proofed to be very stable when mechanical loads were applied. The mechanism of soil deformation for both structure formation by internal hydraulic stresses and structure degradation by external mechanical stresses were in both cases controlled by pre-existing (micro)-structures. Especially during wetting such structures served as a nucleus for subsequent structure evolution. The results demonstrate the potential of more detailed non-invasive micromechanical analysis of soil deformation processes which could improve the conceptual understanding of the physical behavior of soil systems.
Keywords
- 3D correlation analysis, Image analysis, Soil compaction, Soil mechanics, Stress-strain relationships, X-ray microtomography
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Agronomy and Crop Science
- Agricultural and Biological Sciences(all)
- Soil Science
- Earth and Planetary Sciences(all)
- Earth-Surface Processes
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In: Soil and Tillage Research, Vol. 111, No. 1, 12.2010, p. 3-18.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Non-invasive 3D analysis of local soil deformation under mechanical and hydraulic stresses by μCT and digital image correlation
AU - Peth, S.
AU - Nellesen, J.
AU - Fischer, G.
AU - Horn, R.
PY - 2010/12
Y1 - 2010/12
N2 - Soil deformation is a perpetual process in the pedosphere where besides physicochemical stresses primarily alternating hydraulic and mechanical stresses continuously re-arrange the configuration of solid particles. In this study we present a local strain analysis and changes in soil structure resulting from hydraulic and mechanical stresses based on X-ray microtomography data. Digital image reconstructions were used to quantify local structural pore space characteristics and local soil deformation by 3D morphological and correlation analysis of grayscale tomograms. Swelling and shrinkage resulted in a complex heterogeneous soil structure which proofed to be very stable when mechanical loads were applied. The mechanism of soil deformation for both structure formation by internal hydraulic stresses and structure degradation by external mechanical stresses were in both cases controlled by pre-existing (micro)-structures. Especially during wetting such structures served as a nucleus for subsequent structure evolution. The results demonstrate the potential of more detailed non-invasive micromechanical analysis of soil deformation processes which could improve the conceptual understanding of the physical behavior of soil systems.
AB - Soil deformation is a perpetual process in the pedosphere where besides physicochemical stresses primarily alternating hydraulic and mechanical stresses continuously re-arrange the configuration of solid particles. In this study we present a local strain analysis and changes in soil structure resulting from hydraulic and mechanical stresses based on X-ray microtomography data. Digital image reconstructions were used to quantify local structural pore space characteristics and local soil deformation by 3D morphological and correlation analysis of grayscale tomograms. Swelling and shrinkage resulted in a complex heterogeneous soil structure which proofed to be very stable when mechanical loads were applied. The mechanism of soil deformation for both structure formation by internal hydraulic stresses and structure degradation by external mechanical stresses were in both cases controlled by pre-existing (micro)-structures. Especially during wetting such structures served as a nucleus for subsequent structure evolution. The results demonstrate the potential of more detailed non-invasive micromechanical analysis of soil deformation processes which could improve the conceptual understanding of the physical behavior of soil systems.
KW - 3D correlation analysis
KW - Image analysis
KW - Soil compaction
KW - Soil mechanics
KW - Stress-strain relationships
KW - X-ray microtomography
UR - http://www.scopus.com/inward/record.url?scp=78149413696&partnerID=8YFLogxK
U2 - 10.1016/j.still.2010.02.007
DO - 10.1016/j.still.2010.02.007
M3 - Article
AN - SCOPUS:78149413696
VL - 111
SP - 3
EP - 18
JO - Soil and Tillage Research
JF - Soil and Tillage Research
SN - 0167-1987
IS - 1
ER -