Search Results - "Koolen, A.J."

Suitability of pre-compression stress as the real critical stress of unsaturated agricultural soils by Mosaddeghi, M.R., Koolen, A.J., Hajabbasi, M.A., Hemmat, A., Keller, T.

“…This study was conducted to examine if the pre-compression stress σ pc is the major critical stress influencing soil physical quality indices, i.e. air…”
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Test speed and other factors affecting the measurements of tree root properties used in soil reinforcement models by Cofie, P., Koolen, A.J.

“…Measured values of the mechanical properties of tree roots are found to be affected by a number of factors. Shear properties of tree roots are found to be…”
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Comparisons of different procedures of pre-compaction stress determination on weakly structured soils by Mosaddeghi, M.R., Koolen, A.J., Hemmat, A., Hajabbasi, M.A., Lerink, P.

“…Compaction is an important component of soil degradation. In this regard, the pre-compaction stress ( σ pc) concept is considered useful in mechanized…”
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The essential mechanics of capillary crumbling of structured agricultural soils by Aluko, O.B, Koolen, A.J

“…In soil loosening processes like seedbed preparation, significant soil crumbling is often desired. A better understanding of the mechanics of crumbling is…”
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Soil dynamics of the origination of soil tare during sugar beet lifting by Vermeulen, G.D., Koolen, A.J.

“…High soil tare of sugar beet on wet clay soil after uprooting with share lifters is usually attributed to the fact that the soil becomes sticky due to…”
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Axial stress–strain relationships of fine roots of Beech and Larch in loading to failure and in cyclic loading by Makarova, O.V., Cofie, P., Koolen, A.J.

“…Vegetation roots contribute to the bearing capacity and stability of soils. In existing models of soil reinforcement by roots (land slide models), axial…”
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Dynamics and characteristics of pore space changes during the crumbling on drying of structured agricultural soils by Aluko, O.B., Koolen, A.J.

“…An investigation was carried out to examine the characteristics and dynamics of pore space changes, during drying of a structured agricultural soil under…”
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Soil precompression stress: II. A comparison of different compaction tests and stress–displacement behaviour of the soil during wheeling by Keller, T, Arvidsson, J, Dawidowski, J.B, Koolen, A.J

“…Precompression stress is often used as a criterion for soil susceptibility to compaction. The objective of this study was to compare precompression stresses…”
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Simulation of a soil loosening process by means of the modified distinct element method by Momozu, M, Oida, A, Yamazaki, M, Koolen, A.J

“…We apply the Distinct Element Method (DEM) to analyze the dynamic behavior of soil. However, the conventional DEM model for calculation of contact forces…”
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FEM analysis of subsoil reaction on heavy wheel loads with emphasis on soil preconsolidation stress and cohesion by Poodt, M.P, Koolen, A.J, Linden, J.P

“…Heavy sugarbeet harvesters may compact subsoil. But it is very difficult to study this by field experiments that resemble agricultural practice. Therefore, an…”
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Soil precompression stress by Keller, T, Arvidsson, J, Dawidowski, J.B, Koolen, A.J

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FEM analysis of subsoil reaction on heavy wheel loads with emphasis on soil preconsolidation stress and cohesion by Poodt, M.P, Koolen, A.J, van der Linden, J.P

“…Heavy sugarbeet harvesters may compact subsoil. But it is very difficult to study this by field experiments that resemble agricultural practice. Therefore, an…”
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Measurement of stress–strain relationship of beech roots and calculation of the reinforcement effect of tree roots in soil–wheel systems by Cofie, P, Koolen, A.J, Perdok, U.D

“…Evidence from forestry shows that part of the forest floor bearing capacity is delivered by tree roots. The beneficial effect varies and diminishes with…”
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Fracture behavior of a cohesive soil under crushing stress loading by Ashenavi, T.A, Koolen, A.J

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Simulation of oxygen regime of tree substrates by Balakina, Julia N., Makarova, Olga V., Bondarenko, Vasily V., Koudstaal, Leendert J., Ros, Evert J., Koolen, Adrianus J., van Loon, Wilko K.P.

“…The oxygen regime of urban tree-growing sites may be sub-optimal for tree growth and the related ornamental value of trees. Problems may especially occur in…”
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Introduction to symposium 19: construction and use of artificial soils by Koolen, A.J, Rossignol, J.P

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Fracture behavior of a cohesive soil under crushing stress loading by Abebe, Ashenafi Tessema, Koolen, A.J.

“…In this study the concepts of engineering fracture mechanics are used to investigate the behavior of cohesive soil crumbling. Prior to the analysis, the…”
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