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Laboratory Studies Into Undercarriage Systems 3.3.2 Evaluation of Different Types of Rubber Tracks The performance of the TerraTrac in comparison with tyres measured by Ansorge (2005, a) raised the question how alternative sprocket driven track units compare with respect to their influence on soil physical properties. Therefore 3 alternative track units were com- pared to the TerraTrac; all run at a load of 12 t. The alternative units were namely a West- track, a Stocks, and a prototype called SPT. The characteristics of the units are detailed in Table 10 and a photograph of each is given in Figure 40. All units had the same belt width of 750 mm except the TerraTrac with a width of 635 mm. Table 10: Characteristics of rubber track units Track Unit Belt width (mm) Centre front-rear roller length (mm) Contact length Ph.D. Thesis Dirk Ansorge (2007) (mm) Number of rollers TerraTrac 635 1825 2300 5 0,83 Westtrack 750 1600 1850 5 0,86 Stocks 750 1460 1750 4 0,92 SPT 750 1400 1750 3 0,92 52 Contact Pressure Figure 40: Track units; TerraTrac, Westtrack, SPT, and Stocks (clockwise from top left) (bar)
Laboratory Studies Into Undercarriage Systems 3.3.2.1 Penetrometer Resistance The penetrometer resistance for all track units and the control is shown in Figure 41. All units created pronounced peaks at the surface as previously found by Ansorge (2005, a) whereby the SPT unit exhibited the least decrease in penetrometer resistance with depth. Both, the Westtrack and Stocks unit were statistically significantly different from the SPT unit with p-values of 0.0136 and 0.0475, respectively. Other combinations were not significantly different. Depth (mm) 0 100 200 300 400 500 600 700 800 Penetration Resistance (MPa) 0 0,5 1 1,5 2 2,5 3 Figure 41: Penetrometer resistance vs. depth for different track units 3.3.2.2 Soil Displacement Control TerraTrac Stocks Westrack Ph.D. Thesis Dirk Ansorge (2007) SPT LSD at 95% CI The soil displacement diagram for the different track units is shown in Figure 42. West- track and Stocks created the least soil displacement followed by the TerraTrac unit at 50 bar belt pressure (the TerraTrac at normal belt pressure was excluded due to the reasons detailed in Section 3.3.1.2). SPT caused the most soil displacement. Statistically only the SPT unit was significantly different from all other units with a p-value ranging from
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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
Page 17 and 18: Introduction 1 INTRODUCTION 1.1 Bac
Page 19 and 20: Introduction � Ansorge, D. and Go
Page 21 and 22: Introduction 1.2 Aim To elucidate t
Page 23 and 24: Introduction a) the soil compaction
Page 25 and 26: Experimental Methods 2.1.1.1 Test F
Page 27 and 28: Experimental Methods had been mount
Page 29 and 30: Experimental Methods track; the loa
Page 31 and 32: Experimental Methods 800/10.5/2.5 t
Page 33 and 34: Experimental Methods term. In the m
Page 35 and 36: Experimental Methods Soil Surface F
Page 37 and 38: Experimental Methods Depth (cm) 0 1
Page 39 and 40: Experimental Methods ence surface c
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 67: Laboratory Studies Into Undercarria
Page 77 and 78: 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
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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
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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
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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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