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Field Study With Full Size Combine Harvesters type, e.g. on the subsoiled plot the tyre and the tyre at high inflation pressure were statistically the same concerning the average rut depth. Hence, an analysis of variance was carried out with the parameters tyre, soil and tyre soil interaction to ease the comparison of different treatments when looking at Table 17. All three parameters were significant and the results in relation to the measured parameters and statistical differences amongst treatments and amongst soil types are shown in Table 18 and Table 19, respectively. Table 16: Rut parameter field trials including all treatments Treatment Aver. Max Depth (mm) Aver. Aver. Depth (mm) Aver. Width (mm) Subsoiled Track 1 90 55 920 Subsoiled Track 2 102 70 903 Subsoiled Tyre 1 112 80 873 Subsoiled Tyre 2 120 103 907 Subsoiled High 152 100 953 Shallow Track 1 48 20 670 Shallow Track 2 50 18 790 Shallow Tyre 1 43 23 873 Shallow Tyre 2 63 47 810 Shallow High 73 55 830 Clay Track 1 55 25 857 Clay Track 2 60 35 860 Clay Tyre 1 82 63 850 Clay Tyre 2 88 52 830 Clay High 105 82 830 All treatments are significantly different with regard to their maximum rut depth and average rut depth, however, average rut width was the same for all treatments. The significant difference in maximum rut depth and average rut depth in the field experiments confirmed the results from the soil bin. As soil displacement, soil density and penetrometer resistance were mainly influenced by rut depth, this clear result put emphasis on the differences seen in penetrometer resistance and soil displacement. Ph.D. Thesis Dirk Ansorge (2007) 74
Field Study With Full Size Combine Harvesters Table 17: Rut parameters, same treatments averaged together, statistically same values are followed by the same letter Subsoiled Aver. Max Aver. Aver. Aver. Depth (mm) Depth (mm) Width Average Tyre 116 a 92 a 890 a Average Track 96 b 63 b 912 a Average High Pressure 152 c 100 a 953 b Shallow Tilled Average Tyre 53 d 35 c 842 c Average Track 49 d 19 d 730 d Average High Pressure 73 e 55 e 830 c Clay Average Tyre 85 f 58 e 840 c Average Track 58 d 30 c 858 c Average High Pressure 105 b 82 f 830 c LSD 9 9 39 Table 18: General statistical analysis of rut parameters in relation to treatment (statistically different treatments are followed by different letters) Treatment Aver. Max. Depth (mm) Aver. Aver. Depth (mm) Average Rut Width (mm) Tyre 85a 61a 857a Track 68b 37b 835a High Inflation 110c 79c 871a LSD 9 9 39 The statistically identical rut width for all treatments was due to the fact that the rear tyre of a tracked combine harvester did not run in line with the track, but approximately 15 cm offset resulting in the same rut width as a wheeled combine harvester with front tyres wider than the belt of the track, but the rear tyres running in line. To reduce the trafficked area of the field it was strongly recommended to let the tyres run in line with the front axle. Ph.D. Thesis Dirk Ansorge (2007) 75
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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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Page 41 and 42: Experimental Methods chine derives
Page 43 and 44: Experimental Methods depth. The dat
Page 45 and 46: Experimental Methods with water and
Page 47 and 48: Experimental Methods 2.4 Statistica
Page 49 and 50: Laboratory Studies Into Undercarria
Page 77 and 78: Field Study With Full Size Combine
Page 89: Field Study With Full Size Combine
Page 99 and 100: Alleviation of Soil Compaction Howe
Page 101 and 102: Alleviation of Soil Compaction not
Page 103 and 104: Alleviation of Soil Compaction in a
Page 105 and 106: Alleviation of Soil Compaction diff
Page 107 and 108: Soil Compaction Models sibilities t
Page 109 and 110: Soil Compaction Models depends on t
Page 111 and 112: Soil Compaction Models Wroth (1968)
Page 113 and 114: Soil Compaction Models however, the
Page 115 and 116: Soil Compaction Models level. Criti
Page 117 and 118: Soil Compaction Models Utilizing Ke
Page 119 and 120: Soil Compaction Models average of m
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 and 132: Soil Compaction Models and 13.7 % b
Page 133 and 134: Soil Compaction Models Rel. Density
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
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Soil Compaction Models This result
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Soil Compaction Models 6.6.1.3 Wate
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Soil Compaction Models σσ 1 (kPA)
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Soil Compaction Models pressure to
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Soil Compaction Models The response
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Soil Compaction Models On medium so
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Soil Compaction Models SOILFLEX tak
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Ancillary Experiments 7 ANCILLARY E
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Ancillary Experiments Average conta
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Ancillary Experiments In order to c
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Ancillary Experiments contrary, the
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Ancillary Experiments Figure 102: S
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Ancillary Experiments track and the
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Ancillary Experiments even when hav
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Ancillary Experiments 7.3.2 Influen
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Ancillary Experiments The results f
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Ancillary Experiments Figure 117: S
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Ancillary Experiments Contact Press
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Ancillary Experiments Figure 123: F
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Ancillary Experiments Sinkage (mm)
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Ancillary Experiments model which o
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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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