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Soil Compaction Models Depth (mm) 0 100 200 300 400 500 600 Displacement (mm) 0 20 40 60 80 Depth (mm) Ph.D. Thesis Dirk Ansorge (2007) 0 100 200 300 400 500 600 Dispalcement (mm) 116 0 20 40 60 80 100 Figure 80: Predicted vs. measured soil displacement on clay soil in field for � of 4 (- - -) and 5 (- • -) at normal (2.5 bar) [squares] and high inflation pressure (3.5 bar) [triangles] 6.3.4.2 Sandy Loam Soil In this section the data from both the sandy loam shallow tilled and subsoiled experiments will be pooled to gain the slope and intercept of a VCL. The identical procedure as de- scribed in the previous section was used to gain the slope and intercept of the VCL. In Ap- pendix 1/1.4.2 a split of the VCL according to the different tillage treatments is provided showing marginal differences and the DBD profile is given, too. The resulting VCLs for a � of 4 and 5 are shown in Figure 81. The predicted soil displacement for the VCLs is shown in Figure 82 for the shallow tilled soil. Soil displacement is larger for a � of 5 compared to a � of 4. Overall a � of 4 fits better in the field, however, using the VCL created in the soil bin on the same soil type with a � of 5 was found to fit best. This is due to the fact that the VCL from the soil bin contains more and better defined data points. The field experiment was conducted at a moisture content of approxi- mately 20 % while the soil bin experiment was conducted at about 9 %. The good agree- ment in predicted soil displacement using the soil bin VCL is due to a similar distance from optimum moisture content for compaction which is at about 15 % moisture content for a sandy loam soil.
Soil Compaction Models Rel. Density 3 2,5 2 1,5 1 0,5 0 y = -0,2592Ln(x) + 2,6586 R 2 = 0,996 y = -0,2542Ln(x) + 2,6587 R 2 = 0,9961 1 10 100 Mean Normal Pressure (kPa) Conc = 5 Conc=4 Logarithmisch (Conc = 5) Figure 81: Virgin compression lines from two concentration factors of field experi- Depth (mm) 0 100 200 300 400 500 600 700 ments on sandy loam soil Displacement (mm) 0 10 20 30 40 50 60 70 80 Conc Factor 5 Conc Factor 4 Soil Bin VCL Depth (mm) Ph.D. Thesis Dirk Ansorge (2007) 0 100 200 300 400 500 600 700 Displacement (mm) 117 0 20 40 60 80 Figure 82: Measured (points) and predicted (lines) soil displacement for the normal Conc Factor 5 Conc Factor 4 Soil Bin VCL (2.5 bar) (left hand side) and high inflation pressure (3.5 bar) (right hand side) treatment on shallow tilled sandy loam soil Predicted vs. measured data for the sandy loam soil subsoiled is shown in Figure 83. � of 4 fits the data for the normal inflation pressure better than � of 5. However, at high inflation pressure a � of 5 seems more appropriate because it overcomes the under estimated soil displacement for this passage. Thus on this soil condition no clear recommendation can be given concerning � .
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Cranfield University School of Appl
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Abstract Ancillary experiments show
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Table of Contents TABLE OF CONTENTS
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Table of Contents 4.1.3 Analysis of
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Table of Contents 11.1.1.1 Comparis
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List of Figures and Tables Figure 3
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List of Figures and Tables Figure 1
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Nomenclature NOMENCLATURE Abbreviat
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Introduction 1 INTRODUCTION 1.1 Bac
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Introduction � Ansorge, D. and Go
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Introduction 1.2 Aim To elucidate t
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Introduction a) the soil compaction
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Experimental Methods 2.1.1.1 Test F
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Experimental Methods had been mount
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Experimental Methods track; the loa
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Experimental Methods 800/10.5/2.5 t
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Experimental Methods term. In the m
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Experimental Methods Soil Surface F
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Experimental Methods Depth (cm) 0 1
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Experimental Methods ence surface c
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Experimental Methods chine derives
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Experimental Methods depth. The dat
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Experimental Methods with water and
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Experimental Methods 2.4 Statistica
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Laboratory Studies Into Undercarria
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Field Study With Full Size Combine
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Field Study With Full Size Combine
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Page 99 and 100: Alleviation of Soil Compaction Howe
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Page 107 and 108: Soil Compaction Models sibilities t
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Page 111 and 112: Soil Compaction Models Wroth (1968)
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Page 117 and 118: Soil Compaction Models Utilizing Ke
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Page 121 and 122: Soil Compaction Models Depth (mm) -
Page 123 and 124: Soil Compaction Models ture content
Page 125 and 126: Soil Compaction Models with four ot
Page 127 and 128: Soil Compaction Models Predicted In
Page 129 and 130: Soil Compaction Models Depth (mm) -
Page 131: Soil Compaction Models and 13.7 % b
Page 135 and 136: Soil Compaction Models VCL paramete
Page 137 and 138: Soil Compaction Models The approach
Page 139 and 140: Soil Compaction Models surface stay
Page 141 and 142: Soil Compaction Models This result
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Page 145 and 146: Soil Compaction Models σσ 1 (kPA)
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Page 149 and 150: Soil Compaction Models The response
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Page 155 and 156: Ancillary Experiments 7 ANCILLARY E
Page 157 and 158: Ancillary Experiments Average conta
Page 159 and 160: Ancillary Experiments In order to c
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Page 169 and 170: Ancillary Experiments 7.3.2 Influen
Page 171 and 172: Ancillary Experiments The results f
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Page 175 and 176: Ancillary Experiments Contact Press
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Page 179 and 180: Ancillary Experiments Sinkage (mm)
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Ancillary Experiments 7.3.5 The Inf
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Ancillary Experiments 7.3.7 Discuss
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Ancillary Experiments Terzaghi (194
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Ancillary Experiments contact area.
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Ancillary Experiments soil forward
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Conclusions � The longitudinal so
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Bibliography 10 BIBLIOGRAPHY Aboaba
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Bibliography Defossez, P., Richard,
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Bibliography Gregory, A.S.; Whalley
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Bibliography Lamande, M., Schjonnin
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Bibliography Seig, D., 1985. Soil C
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Appendix 11 APPENDIX Ph.D. Thesis D
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Appendix Figure 32: VCL sample at t
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Appendix comparison at the deepest
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Appendix Estimated Pressure (kPa) 2
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Appendix 11.1.1.2.1 SOCOMO One of t
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Appendix by Seig (1985) who showed
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Appendix Soil water content 15 % an
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Appendix Adapting critical state so
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Appendix density is obtained by add
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Appendix Table 5: Values of constan
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Appendix choice of a concentration
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Appendix 11.1.3.1 Dense/Hard and Lo
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Appendix 11.1.3.2 Stratified Soil C
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Appendix To summarize the ability t
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Appendix In the following the predi
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Appendix concentration factor of 4,
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Appendix 11.1.5.1 Confining Pressur
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Appendix Figure 24. The VCL created
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Appendix Rel. Density 2 1,9 1,8 1,7
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Appendix relation of � 1 to � 2
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Appendix Rel. Density 2 1,9 1,8 1,7
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Appendix Rel. Density 1,7 1,68 1,66
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Appendix Depth (mm) 0,0 100,0 200,0
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Appendix Figure 42: Plate in cookin
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Appendix � z � � �� k c p
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Appendix Table 8: n and k depending
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Appendix to the plate sinkage equat
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Appendix with a slight deviation fr
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Appendix Table 12: DBD values for a
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