Trafficability Predictions in Tropical Soils
Author | : Waterways Experiment Station (U.S.) |
Publisher | : |
Total Pages | : 128 |
Release | : 1960 |
Genre | : Puerto Rico |
ISBN | : |
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Author | : Waterways Experiment Station (U.S.) |
Publisher | : |
Total Pages | : 128 |
Release | : 1960 |
Genre | : Puerto Rico |
ISBN | : |
Author | : Waterways Experiment Station (U.S.) |
Publisher | : |
Total Pages | : 84 |
Release | : 1959 |
Genre | : Canal Zone |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 0 |
Release | : 1966 |
Genre | : |
ISBN | : |
The soil-moisture prediction method for U.S. soils was applied to sites located in the the Panama Canal Zone to determine whether the method was applicable for the prediction of moisture content of tropical soils. Factors necessary for the predictions were obtained at specific sites, and analysis of data shows that the method is applicable to Panama soils. Groundwater did not have an appreciable influence on soil-moisture depletion since drainage from the 0- to 12-in. layer was rapid. An analysis of strength data showed a highly significant relation between moisture content and cone index, and a lesser degree of significance between moisture content and rating cone index. No relation was found between moisture content and remolding index. On the basis of rating cone index, the trafficability of the residual soils was considered good. Trafficability of the alluvial marshland soils was considered good during the dry season and poor during the wet season.
Author | : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS. |
Publisher | : |
Total Pages | : 65 |
Release | : 1959 |
Genre | : |
ISBN | : |
The study of soil trafficability prediction was extended to a humid tropical climate to determine whether the prediction system as developed for soils in temperate climates could also be successfully applied to soils in tropical climates. Four sites in the Panama Canal Zone were selected for study, and soil moisture and strength data were collected weekly from these sites for a period of eighteen months. The average prediction relations previously derived from data measured in a temperate climate (United States) and in a tropical climate (Puerto Rico) were then applied to the data collected in Panama. Results are discussed.
Author | : James Garland Kennedy |
Publisher | : |
Total Pages | : 292 |
Release | : 1968 |
Genre | : Puerto Rico |
ISBN | : |
Author | : Alvin R. McDaniel |
Publisher | : |
Total Pages | : 103 |
Release | : 1967 |
Genre | : |
ISBN | : |
Soil trafficability studies have shown that the strength of a soil is of major importance to vehicle mobility and varies principally with soil moisture; therefore, a means of predicting moisture content of a soil is essential to the forecasting of soil trafficability. The U.S. Army Engineer Waterways Experiment Station (WES) soil-moisture prediction method for United States soils was applied to sites in Costa Rica to determine whether the method was applicable for the prediction of moisture content of tropical soils. Data necessary for the predictions were collected on five sites in the Premontane wet climate of the Reventazon Valley at Turrialba, Costa Rica. Changes in soil moisture content, density, strength, and remolding strength with changes in weather conditions were investigated at regular intervals for 25 months. These data were analyzed and used to predict soil-moisture content and to establish the relation between moisture content and soil strength. The analysis shows that the WES method is applicable to prediction of soil-moisture content at the five sites in Costa Rica. Groundwater did not have an appreciable influence on soil-moisture depletion since drainage from the 0- to 12-in. (0- to 30.5-cm) soil layer was related directly to rainfall. Topography was shown to influence soil-moisture content to some degree. Analysis of strength data showed a highly significant relation between soil strength and moisture content. On the basis of rating cone index, the trafficability of the soils was considered poor during the wet season and good during the latter part of the dry season. Basic data and photographs for each test site are included. (Author).
Author | : Alvin R. McDaniel |
Publisher | : |
Total Pages | : 77 |
Release | : 1967 |
Genre | : |
ISBN | : |
Soil trafficability studies have shown that the strength of a soil is of major importance to vehicle mobility and varies principally with soil moisture; therefore, a means of predicting moisture content of a soil is essential to the forecasting of soil trafficability. The U.S. Army Engineer Waterways Experiment Station (WES) soil-moisture prediction method for United States soils was applied to sites in Colombia to determine whether the method was applicable for the prediction of moisture content of tropical soils. Data were collected at four prediction development sites in the subhumid climate of the 'Sabana de Bogota' located in the Andean Mountain ranges of Colombia. Changes in soil-moisture content, soil density, and soil strength with changes in weather conditions were investigated periodically for one year. These data were analyzed and used to predict daily soil-moisture content and to establish the relation between soil-moisture content and soil strength. The results show that the WES soil-moisture prediction method is applicable to prediction of soil-moisture content at the four sites in Colombia. Data were of sufficient quantity to establish soil-moisture depletion curves for each site but not of sufficient quantity to establish accretion relations. Relations were established between soil-moisture content and soil strength at all sites. Trafficability of the soils tested, as indicated by rating cone index, was good even when the soils were at maximum moisture content. Basic data and photographs for each test site are included. (Author).