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Further Requirements and Practical Suggestions 9 FURTHER REQUIREMENTS AND PRACTICAL SUGGESTIONS � An investigation of vertical and horizontal soil displacement characteristic under the application of higher track and tyre slippage. � Future work would need to show whether there is a difference on total soil displacement due to lug height; ideally with a lugged and an unlugged tyre. � Linking pressure transition throughout the soil to soil displacement. � Improving the prediction of contact pressure particularly for under and overinflated tyres as existing predictions proofed to be unsatisfactory in this range. � Agronomical study enlightening the monetary benefit from tracked vs. wheeled machinery and ideally comparing tracked vs. wheeled mechanization schemes. � A different attachment system for the tracks might be useful in order to evenly bal- ance the tracks under traction, thereby improving their performance in context with soil compaction. � The influence of VCL parameters on the predicted shape of the soil displacement curve would be interesting as from the in-situ track VCL it appears as if the curva- ture is slightly different than after tyres. � The VCL, however obtained, obviously depends on the stress configuration of mi- nor and major principal stresses. Therefore it would be beneficial to set up a more general relationship between those properties. � If it was possible to link drop cone data (Godwin et al., 1991) to small scale plate sinkage data deriving an in-situ VCL, a second field - possible method for deriving in-situ VCL parameters was available besides full size machinery. � A further improvement of track design with respect to belt width and tension and roller distribution would be beneficial. Smoothening pressure peaks while simultaneously maintaining the insensitivity of the system against dirt would be beneficial. � Confirming the findings of the LPPL with TexScan due to a better defined contact area and measuring displacement simultaneously with pressure would allow more detailed information about tracks. � An investigation into the effect of concentration factor onto pressure transition throughout soils at different densities to confirm/validate/evaluate the findings of this study and Etienne and Steinemann. Ph.D. Thesis Dirk Ansorge (2007) 178
Bibliography 10 BIBLIOGRAPHY Aboaba, F.O., 1969. Effects of Time on Compaction of Soils by Rollers. Trans. ASAE 11, 302-304. Adam, K.M., and Erbach, D.C., 1995. Relationship of tire sinkage depth to depth of soil compaction. Trans. ASAE 38/4:1011-1016. Adams, B.A. and Wulfsohn, D.J., 1998. Critical-state behavior of an agricultural soil. J. Ag. Eng. Res. 70: 345-354. Alexandrou, A., 1995. The development of techniques for assessing compactability of field soils. PhD Thesis Cranfield University, Silsoe College. Thesis D/95/153 Ansorge, D., 2005, a. Comparison of soil compaction below wheels and tracks. M. by. Res. Thesis, Cranfield University at Silsoe. Classified until 10/2008 Ansorge, D., 2005, b. Design of a single wheel soil interaction test rig. Master Thesis, Uni- versity of Hohenheim. Ansorge, D. and Godwin, R.J., 2007. The Effect of Tyres and a Rubber Track at High Axle Loads on Soil Compaction: Part 1: Single Axle Studies. Biosystems Engineering, doi:10.1016/j.biosystemseng.2007.06.005 Arvidsson, J. and Hakansson, I., 1996. Do effects of soil compaction persist after plough- ing? Results from 21 long – term field experiments in Sweden. Soil & Tillage Res. 39: 175 – 197. Bailey, A. C. and Johnson, C.E., 1989. A soil compaction model for cylindrical stress states. Trans. ASAE 32: 822-825. Baumgartl, Th. and Koeck, B., 2004. Modeling volume change and mechanical properties with hydraulic models. Soil Science of America Journal 68: 57-65. Ph.D. Thesis Dirk Ansorge (2007) 179
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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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Alleviation of Soil Compaction Howe
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Alleviation of Soil Compaction not
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Alleviation of Soil Compaction in a
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Alleviation of Soil Compaction diff
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Soil Compaction Models sibilities t
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Soil Compaction Models depends on t
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Soil Compaction Models Wroth (1968)
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Soil Compaction Models however, the
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Soil Compaction Models level. Criti
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Soil Compaction Models Utilizing Ke
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Soil Compaction Models average of m
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Soil Compaction Models Depth (mm) -
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Soil Compaction Models ture content
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Soil Compaction Models with four ot
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Soil Compaction Models Predicted In
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Soil Compaction Models Depth (mm) -
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Soil Compaction Models and 13.7 % b
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Soil Compaction Models Rel. Density
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Soil Compaction Models VCL paramete
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Soil Compaction Models The approach
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Soil Compaction Models surface stay
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Soil Compaction Models This result
Page 143 and 144: Soil Compaction Models 6.6.1.3 Wate
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Page 149 and 150: Soil Compaction Models The response
Page 151 and 152: Soil Compaction Models On medium so
Page 153 and 154: Soil Compaction Models SOILFLEX tak
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
Page 161 and 162: Ancillary Experiments contrary, the
Page 163 and 164: Ancillary Experiments Figure 102: S
Page 165 and 166: Ancillary Experiments track and the
Page 167 and 168: Ancillary Experiments even when hav
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
Page 177 and 178: Ancillary Experiments Figure 123: F
Page 179 and 180: Ancillary Experiments Sinkage (mm)
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Page 183 and 184: Ancillary Experiments 7.3.5 The Inf
Page 185 and 186: Ancillary Experiments 7.3.7 Discuss
Page 187 and 188: Ancillary Experiments Terzaghi (194
Page 189 and 190: Ancillary Experiments contact area.
Page 191 and 192: Ancillary Experiments soil forward
Page 193: Conclusions � The longitudinal so
Page 197 and 198: Bibliography Defossez, P., Richard,
Page 199 and 200: Bibliography Gregory, A.S.; Whalley
Page 201 and 202: Bibliography Lamande, M., Schjonnin
Page 203 and 204: Bibliography Seig, D., 1985. Soil C
Page 205 and 206: Appendix 11 APPENDIX Ph.D. Thesis D
Page 207 and 208: Appendix Figure 32: VCL sample at t
Page 209 and 210: Appendix comparison at the deepest
Page 211 and 212: Appendix Estimated Pressure (kPa) 2
Page 213 and 214: Appendix 11.1.1.2.1 SOCOMO One of t
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Page 217 and 218: Appendix Soil water content 15 % an
Page 219 and 220: Appendix Adapting critical state so
Page 221 and 222: Appendix density is obtained by add
Page 223 and 224: Appendix Table 5: Values of constan
Page 225 and 226: Appendix choice of a concentration
Page 227 and 228: Appendix 11.1.3.1 Dense/Hard and Lo
Page 229 and 230: Appendix 11.1.3.2 Stratified Soil C
Page 231 and 232: Appendix To summarize the ability t
Page 233 and 234: Appendix In the following the predi
Page 235 and 236: Appendix concentration factor of 4,
Page 237 and 238: Appendix 11.1.5.1 Confining Pressur
Page 239 and 240: Appendix Figure 24. The VCL created
Page 241 and 242: Appendix Rel. Density 2 1,9 1,8 1,7
Page 243 and 244: 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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