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Title: Predicting soil strength in terms of cone index and California bearing ratio for trafficability
Authors: Mason, George L.
Baylot, E. Alex.
Keywords: Shear strength of soils.
Soil moisture--Measurement.
Publisher: United States. Army. Corps of Engineers.
Engineer Research and Development Center (U.S.)
Geotechnical and Structures Laboratory (U.S.)
Series/Report no.: ERDC/GSL ; TN-16-1
Abstract: Purpose: A study was conducted of parameters used to adequately describe soil strength for trafficability as related to changes in moisture. Modeling the weather conditions in combination with the terrain will create dynamically changing soil conditions. Off-road predictions of mobility, the detection of buried ordnance, and expedient horizontal construction require a firm understanding of these temporal and spatial changes in the heterogeneous soil system. To validate and verify the soil parameters used to drive a model, rapid and repeatable methods of measuring the soil strength and related physical properties are desired. These testing methods, in turn, drive the selection of appropriate soil parameters. Physical properties of the soil (moisture, porosity, density, chemistry) are not as dependent on the measuring device as mechanical soil properties. Furthermore, the measured physical soil properties do not always provide a direct correlation to the mechanical parameters. Moreover, the temporal and spatial variability of the soil often require the quantification of additional states (i.e., correlations to water table depth). This paper reviews the field tests used to describe the lumped parameters in a soil for trafficability predictions. The parameters of specific interest, in this paper, are those used in the NATO Reference Mobility Model Version 2 (NRMMII) sub-models describing temporal and spatial changes of the soil as a function of weather conditions. Current measurement methods to these approaches are described.
Appears in Collections:Technical Note

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