Accession Number : AD0800144

Title :   VARIATION IN TRAFFICABILITY OF FOUR LOESS SOILS.

Descriptive Note : Final rept. Jan 63-Apr 64,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s) : Bassett, John R. ; McDaniel, Alvin R. ; Knight, Sterling J.

Report Date : AUG 1966

Pagination or Media Count : 44

Abstract : Grain-size distribution, Atterberg limits, organic matter content, dry unit weight, field moisture content, and strength of the 6- to 12-in. soil layer were measured once during the wet season at 65 test sites located in northeast Louisiana and southeast Arkansas. Soils were modal silt loams of four related series: Loring, Grenada, Calloway, and Henry. Series descriptions and typical soil profiles of the soil series are described. Regression analysis was used to relate cone index, remolding index, and rating cone index, respectively, to moisture content for all series, individually and grouped. Differences between individual series regressions were not significant (0.05 level). The group equation for rating cone index was significant (0.01 level) and explained 66 percent of the variation in rating cone index associated with changes in moisture content. To illustrate use of the results, the group equation for rating cone index was used to estimate the trafficability of a forested area for a TD-9 tractor for each day of a 16-month period. The estimates agreed closely with observed field conditions, suggesting that the four series can be combined for trafficability classification. (Author)

Descriptors :   (*SOILS, TRAFFICABILITY), CLASSIFICATION, SOIL MECHANICS, MOBILITY, MOISTURE, CURVE FITTING, COMPRESSIVE PROPERTIES, TREES, LOUISIANA, ARKANSAS.

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE