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Title: Vehicle mobility on thawing soils: interim report on CRREL's test program
Authors: United States. Army. Office of the Chief of Engineers
Shoop, Sally A. (Sally Annette)
Keywords: Frost Effects Research Facility
Road damage
Laboratory tests
Thawing soils
Mobility testing
Vehicle mobility
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 89-31.
Description: Special report
Abstract: Although vehicle mobility in soft and wet soil has been studied in the past, the more complex problem of vehicle mobility on thawing soils has not been addressed. This problem is being examined in CRREL's Frost Effects Research Facility (FERF), where field-scale testing can be conducted under controlled conditions. The soil is frozen and then thawed to the desired test conditions. Traction and motion resistance are measured using an instrumented vehicle. To date, mobility testing has been conducted for nine different thawing conditions of a frost-susceptible silt. The failure mechanisms of the tire-soil interaction were observed, the soil strength was calculated, and vehicle performance was analyzed. For the tire and soil conditions tested, the initial failure of the tire-soil interaction is totally within the soiL At higher tire slip the failure occurs at or near the tire-soil interface. The shear strength data calculated from the vehicle test results indicate that the soil is basically frictional in behavior, with little or no cohesion; however, there is apparent cohesion from soil tension at low moisture contents. Of the soil parameters measured, vehicle traction is most strongly influenced by the soil friction. In turn, soil friction and cohesion are influenced by moisture content, density and thaw depth.
Rights: Approved for Public Release, Distribution is Unlimited
Appears in Collections:Special Report

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