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A statistical analysis was made of soil strength (cone index, remolding index, and rating cone index), soil moisture, dry density, and per cent saturation for soils classified according to the Unified Soil Classification System (USCS) and U.S. Department of Agriculture (USDA) classification system. Data were obtained during wetseason periods from more than 1300 sites located principally in humid, temperate regions of the United States. Soils of high- and low-topography positions were analyzed for average and high-moisture conditions in the wet season. The information was used to improve an existing scheme for classifying soils according to their trafficability. A comparison of USCS and USDA soil types was made for the 6- to 12-in. layer of soils, and a study was made to compare the type of soil in the 0- to 6-in. layer with the type in the 6- to 12-in. layer of the profile, in USDA terms. (Author).
Pertinent soil trafficability data were collected during the wet season at 846 sites in Thailand. The soils were identified according to the Unified Soil Classification System and the U.S. Department of Agriculture textural classification system. Two general topographic positions (high topography and low topography) and two general levels of wetness were considered. A scheme for classifying soils according to their trafficability was developed. The scheme lists the soil types in order of decreasing trafficability under each of three topography-wetness level categories and shows the probability of successful passage on each soil for vehicles of known soil strength requirements. The scheme permits the estimation of the probability of a successful operation for given soil type, topography, and wetness-level conditions. If a choice of several routes and vehicles is available, the determination of the vehicles with the best chances of success over a given route or of the best route for given vehicles can be made. (Author).
A statistical analysis was made of soil strength (cone index, remolding index, and rating cone index), soil moisture, dry density, and per cent saturation for soils classified according to the Unified Soil Classification System (USCS) and U.S. Department of Agriculture (USDA) classification system. Data were obtained during wetseason periods from more than 1300 sites located principally in humid, temperate regions of the United States. Soils of high- and low-topography positions were analyzed for average and high-moisture conditions in the wet season. The information was used to improve an existing scheme for classifying soils according to their trafficability. A comparison of USCS and USDA soil types was made for the 6- to 12-in. layer of soils, and a study was made to compare the type of soil in the 0- to 6-in. layer with the type in the 6- to 12-in. layer of the profile, in USDA terms. (Author).
;Contents: Methods of soil moisture prediction for trafficability purposes; Effects and deficiencies of factors used in WES soil moisture prediction system; A tentative soil strength prediction system; Influence of water tables on soil moisture and soil strength; Influence of soil variability on soil moisture and soil strength predictions; Comparison of soil moisture prediction factors for temperate and tropical climates; Predicting and portraying soil moisture on an areal basis in Costa Rica; Soil trafficability classification scheme.