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Transmission of vertical soil stress under agricultural tyres: comparing measurements with simulations

Transmission of vertical soil stress under agricultural tyres: comparing measurements with simulations
Transmission of vertical soil stress under agricultural tyres: comparing measurements with simulations
The transmission of stress induced by agricultural machinery within an agricultural soil is typically modelled on the basis of the theory of stress transmission in elastic media, usually in the semi-empirical form that includes the “concentration factor” (v). The aim of this paper was to measure and simulate soil stress under defined loads. Stress in the soil profile at 0.3, 0.5 and 0.7 m depth was measured during wheeling at a water content close to field capacity on five soils (13–66% clay). Stress transmission was then simulated with a semi-analytical model, using vertical stress at 0.1 m depth estimated from tyre characteristics as the upper boundary condition, and v was obtained at minimum deviation between measurements and simulations. For the five soils, we obtained an average v of 3.5 (for stress transmitting from 0.1 to 0.7 m depth). This was only slightly different from v = 3 for which the elasticity theory-based classical solution of Boussinesq (1885) is satisfied. We noted that the estimated v was strongly dependent on (i) the reliability of stress measurements, and (ii) the upper stress boundary condition used for simulations. Finite element simulations indicated that the transmission of vertical stresses in a layered soil is not appreciably different from that seen in a homogeneous soil unless very high differences in soil stiffness are considered. Our results highlight the importance of accurate stress readings and realistic upper model boundary conditions, and suggest that the actual stress transmission could be well predicted according to the theory of elasticity for the conditions investigated.
0167-1987
106-117
Keller, T.
41cd2bbf-bf82-4aac-83e9-d585f67f9742
Berli, M.
e92bdb78-5f8c-4c6d-b918-ca3c54bac3c0
Ruiz, S.
d79b3b82-7c0d-47cc-9616-11d29e6a41bd
Lamandé, M.
aee41a29-8152-40b0-8bc5-a27a2ac33554
Arvidsson, J.
01df3a59-dfb0-487c-a974-dc4cc8577f98
Schjønning, P.
f408ab38-1405-42f3-b7bb-181ae90bec05
Selvadurai, A.p.s.
3cabfbec-6f31-492a-b574-3df2881cf329
Keller, T.
41cd2bbf-bf82-4aac-83e9-d585f67f9742
Berli, M.
e92bdb78-5f8c-4c6d-b918-ca3c54bac3c0
Ruiz, S.
d79b3b82-7c0d-47cc-9616-11d29e6a41bd
Lamandé, M.
aee41a29-8152-40b0-8bc5-a27a2ac33554
Arvidsson, J.
01df3a59-dfb0-487c-a974-dc4cc8577f98
Schjønning, P.
f408ab38-1405-42f3-b7bb-181ae90bec05
Selvadurai, A.p.s.
3cabfbec-6f31-492a-b574-3df2881cf329

Keller, T., Berli, M., Ruiz, S., Lamandé, M., Arvidsson, J., Schjønning, P. and Selvadurai, A.p.s. (2014) Transmission of vertical soil stress under agricultural tyres: comparing measurements with simulations. Soil and Tillage Research, 140, 106-117. (doi:10.1016/j.still.2014.03.001).

Record type: Article

Abstract

The transmission of stress induced by agricultural machinery within an agricultural soil is typically modelled on the basis of the theory of stress transmission in elastic media, usually in the semi-empirical form that includes the “concentration factor” (v). The aim of this paper was to measure and simulate soil stress under defined loads. Stress in the soil profile at 0.3, 0.5 and 0.7 m depth was measured during wheeling at a water content close to field capacity on five soils (13–66% clay). Stress transmission was then simulated with a semi-analytical model, using vertical stress at 0.1 m depth estimated from tyre characteristics as the upper boundary condition, and v was obtained at minimum deviation between measurements and simulations. For the five soils, we obtained an average v of 3.5 (for stress transmitting from 0.1 to 0.7 m depth). This was only slightly different from v = 3 for which the elasticity theory-based classical solution of Boussinesq (1885) is satisfied. We noted that the estimated v was strongly dependent on (i) the reliability of stress measurements, and (ii) the upper stress boundary condition used for simulations. Finite element simulations indicated that the transmission of vertical stresses in a layered soil is not appreciably different from that seen in a homogeneous soil unless very high differences in soil stiffness are considered. Our results highlight the importance of accurate stress readings and realistic upper model boundary conditions, and suggest that the actual stress transmission could be well predicted according to the theory of elasticity for the conditions investigated.

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e-pub ahead of print date: 27 March 2014
Published date: 1 July 2014

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Local EPrints ID: 434283
URI: http://eprints.soton.ac.uk/id/eprint/434283
ISSN: 0167-1987
PURE UUID: f392b90d-96fa-487a-9b74-7f38d1780ef1

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Date deposited: 18 Sep 2019 16:30
Last modified: 18 Sep 2019 16:30

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Contributors

Author: T. Keller
Author: M. Berli
Author: S. Ruiz
Author: M. Lamandé
Author: J. Arvidsson
Author: P. Schjønning
Author: A.p.s. Selvadurai

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