Cranfield University

Appendix
Figure 32: VCL sample at the point of incipient shear failure ........................................ 227
Figure 33: Axial displacement vs. axial load on sample VCL_1_241106 ...................... 227
Figure 34: Virgin compression lines for radial and radial-axial loading......................... 228
Figure 35: Replication of radial-axial loading to get a feeling for the variation ............. 228
Figure 36: Averaged VCLs with water compressibility taken into consideration........... 229
Figure 37: VCLs from radial-axial loading at a denser state .......................................... 230
Figure 38:
� 1 in relation to
� 2 and
� 3 depending on intial soil density ......................... 230
Figure 39: Different ways of gaining VCL to describe 900/10.5/1.9 treatment.............. 231
Figure 40: Predicted soil displacement using averaged VCLs at 1.4 g/cm 3 .................... 232
Figure 41: Predicted and independently measured soil displacement ............................. 233
Figure 42: Plate in cooking pot after compression. No sideways heave visible.............. 234
Figure 43: Virgin compression line for plate sinkage tests with different plate sizes..... 234
Figure 44: Measured and differently predicted soil displacement for 900/10.5/1.9........ 234
Figure 45: Track dimensions ........................................................................................... 237
Figure 46: Predicted vs. Measured depth of the tyres from plate sinkage data ............... 238
Figure 47: Predicted vs. Measured depth of the tyres from plate sinkage data ............... 239
Figure 48: DBD values for different treatment groups averaged together ...................... 242
Figure 49: DBD for undercarriage systems split up in wheel and track type soil ........... 243
List of Tables - Appendix
Table 1: Measured and predicted vertical soil stress values for different implements .... 192
Table 2: Pressure measured and predicted with Soil Flex using O’Sullivan (1998)........ 195
Table 3: Initial DBD and moisture content values ........................................................... 198
Table 4: Variation in predicted soil compaction with changes ........................................ 201
Table 5: Values of constants c1, c2, and c3 to estimate stress ratio................................... 206
Table 6: � 2 and � 3 depending on � ............................................................................... 206
Table 7: Treatments and corresponding increase in DBD, final DBD, relative DBD ..... 206
Table 8: n and k depending on initial DBD...................................................................... 238
Table 9: Measured and predicted track sinkages using different approaches .................. 240
Table 10: Footprint characteristics and average contact pressure ...................................... 241
Table 11: DBD values for treatment groups....................................................................... 243
Table 12: DBD values for all treatments............................................................................ 244
Ph.D. Thesis Dirk Ansorge (2007)
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