TRAFFICABILITY TESTS IN FINE-GRAINED SOILS WITH TWO VEHICLES WITH 9- TO 10-TON WHEEL LOADS.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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Trafficability tests were conducted in fine-grained soils with two vehicles with 9- to 10-ton wheel loads, the LeTourneau Electric Digger, Model L-28, and the LeTourneau Log Stacker, Model F. Forty-one go-no go tests were performed on three different soils classified CH, CHCL, and CLML. Results showed that the minimum soil strength requirements vehicle cone indexes for 50 passes of the Electric Digger and the Log Stacker were 185 and 150, respectively. A revised mobility index formula, discussed in Appendix A, proved to be more reliable than the original mobility index formula for computing vehicle cone indexes of the two vehicles. When the Diggers tire inflation pressure was reduced from 75 to 27 psi, the experimental VCI was reduced from 185 to 160. Limited data suggest that the development of trafficability criteria for less than 10 passes of a vehicle will require a careful analysis of the rate of remolding of the soil by vehicle wheels or tracks and of the relative influence of various soil layers. Author
- Soil Mechanics
- Surface Transportation and Equipment