Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 1455-1459 |
| Seitenumfang | 5 |
| Fachzeitschrift | Soil Science Society of America Journal |
| Jahrgang | 71 |
| Ausgabenummer | 5 |
| Publikationsstatus | Veröffentlicht - Sept. 2007 |
Abstract
Measurement of soil strength with sophisticated parameters is tedious and expensive. Therefore, we developed two straightforward methods to determine this parameter down to about 80 cm, based on the classical measurements of bulk density and penetration resistance as a function of depth. They were applied to three profiles of arable Luvisols, all developed from glacial till. For each method, a procedure was worked out that allows expression of the results in terms of a normal (NC) or precompacted (PC) state. We defined the NC state as that observed in packing characteristics of virgin soils like forests and meadows, and the PC state as the packing characteristics that exist in the topsoil of agricultural soils and intensely grazed areas. Bulk density data were used to examine the packing characteristics and over-burden pressures with the assumption that the horizon was in a NC state below 80 cm. For penetration resistance, we assumed a linear increase in penetration resistance with depth to represent the hydrostatic stress distribution in the NC state and deviations of measured values from this line as the PC state. The upper approximately 60 cm of all three soils were compacted, which is proofed both for the penetration resistance and for the bulk density data. For both approaches, the dimensionless coefficient of "stresses at rest," K0, was calculated following the line of thought used in engineering soil mechanics (K0 = σx/σz, where σx and σz are the horizontal and vertical stresses, respectively). The K0 values are highest in the precompacted soil horizons and decrease with depth.
ASJC Scopus Sachgebiete
- Agrar- und Biowissenschaften (insg.)
- Bodenkunde
Zitieren
- Standard
- Harvard
- Apa
- Vancouver
- BibTex
- RIS
in: Soil Science Society of America Journal, Jahrgang 71, Nr. 5, 09.2007, S. 1455-1459.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Mechanical stresses in soils assessed from bulk-density and penetration-resistance data sets
AU - Horn, R.
AU - Hartge, K. H.
AU - Bachmann, J.
AU - Kirkham, M. B.
N1 - Copyright: Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2007/9
Y1 - 2007/9
N2 - Measurement of soil strength with sophisticated parameters is tedious and expensive. Therefore, we developed two straightforward methods to determine this parameter down to about 80 cm, based on the classical measurements of bulk density and penetration resistance as a function of depth. They were applied to three profiles of arable Luvisols, all developed from glacial till. For each method, a procedure was worked out that allows expression of the results in terms of a normal (NC) or precompacted (PC) state. We defined the NC state as that observed in packing characteristics of virgin soils like forests and meadows, and the PC state as the packing characteristics that exist in the topsoil of agricultural soils and intensely grazed areas. Bulk density data were used to examine the packing characteristics and over-burden pressures with the assumption that the horizon was in a NC state below 80 cm. For penetration resistance, we assumed a linear increase in penetration resistance with depth to represent the hydrostatic stress distribution in the NC state and deviations of measured values from this line as the PC state. The upper approximately 60 cm of all three soils were compacted, which is proofed both for the penetration resistance and for the bulk density data. For both approaches, the dimensionless coefficient of "stresses at rest," K0, was calculated following the line of thought used in engineering soil mechanics (K0 = σx/σz, where σx and σz are the horizontal and vertical stresses, respectively). The K0 values are highest in the precompacted soil horizons and decrease with depth.
AB - Measurement of soil strength with sophisticated parameters is tedious and expensive. Therefore, we developed two straightforward methods to determine this parameter down to about 80 cm, based on the classical measurements of bulk density and penetration resistance as a function of depth. They were applied to three profiles of arable Luvisols, all developed from glacial till. For each method, a procedure was worked out that allows expression of the results in terms of a normal (NC) or precompacted (PC) state. We defined the NC state as that observed in packing characteristics of virgin soils like forests and meadows, and the PC state as the packing characteristics that exist in the topsoil of agricultural soils and intensely grazed areas. Bulk density data were used to examine the packing characteristics and over-burden pressures with the assumption that the horizon was in a NC state below 80 cm. For penetration resistance, we assumed a linear increase in penetration resistance with depth to represent the hydrostatic stress distribution in the NC state and deviations of measured values from this line as the PC state. The upper approximately 60 cm of all three soils were compacted, which is proofed both for the penetration resistance and for the bulk density data. For both approaches, the dimensionless coefficient of "stresses at rest," K0, was calculated following the line of thought used in engineering soil mechanics (K0 = σx/σz, where σx and σz are the horizontal and vertical stresses, respectively). The K0 values are highest in the precompacted soil horizons and decrease with depth.
UR - http://www.scopus.com/inward/record.url?scp=36749030617&partnerID=8YFLogxK
U2 - 10.2136/sssaj2006.0044
DO - 10.2136/sssaj2006.0044
M3 - Article
AN - SCOPUS:36749030617
VL - 71
SP - 1455
EP - 1459
JO - Soil Science Society of America Journal
JF - Soil Science Society of America Journal
SN - 0361-5995
IS - 5
ER -