00471831

Component

http://onlinepubs.trb.org...trr/1986/1089/1089-007.pdf

https://scholar.google.co...entz&publication_year=1986

Laboratory repeated load triaxial tests are conducted to estimate the effects of highway traffic on the permanent and resilient deformation of a subgrade sand commonly used as a foundation for a flexible highway pavement structure in Florida. Combinations of confining stress and cyclic principal stress difference (test variables) and of dry unit weight and moisture content (sample variables) are used for each sample and loaded to 10,000 cycles. Confining stress, cyclic principal stress difference, and dry unit weight are correlated with permanent strain and resilient modulus and thus affect deformation properties of these soils. However, moisture content correlates with neither permanent strain nor resilient modulus. Static tests are conducted on various samples similar to those used in the cyclic tests. These results are used to normalize cyclic stress and strain at 10,000 cycles. A regression model is developed for predicting cyclic strain in the sand from satic tests by using a technique previously developed by Lenz. The model is compared to one for Michigan highway subgrade sand. Using a general linear test at a level of significance of 0.05, it is found that the data sets from each sand cannot be pooled to form one reression model. Values of resilient modulus after 10,000 loading cycles for the Florida sand ranged from 16,000 psi (110 240 kPa) at 5 psi (34.5 kPa) confining stress to 56,000 psi (385 840 kPa) at 50 psi (344.5 kPa) confining stress.

Publication of this paper sponsored by Committee on Soil and Rock Properties.Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01418818

pp 49-56

1986

Transportation Research Record

0309041090

Print

Figures (8) ; References (24)

Accelerated tests; Correlation analysis; Deformation; Deformation curve; Forecasting; Mathematical models; Modulus of resilience; Moisture content; Regression analysis; Repeated loads; Sand; Subgrade (Pavements); Triaxial shear tests

Cyclic strain

Florida

Data and Information Technology; Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB

Jul 31 1988 12:00AM

• ANALYSIS OF SLOPE FAILURE IN OVERCONSOLIDATED FISSURED RESIDUAL SOILS: A CASE STUDY
• COMPRESSIBILITY OF COMPACTED FILLS EVALUATED BY THE DILATOMETER
• CONSTRUCTION METHODS TO CONTROL EXPANSIVE SOILS IN SOUTH DAKOTA
• CONTROL OF FROST PENETRATION IN ROAD SHOULDERS WITH INSULATION BOARDS
• DETERMINATION OF THE CRITICAL THAW-WEAKENED PERIOD IN ASPHALT PAVEMENT STRUCTURES
• DRAINED-STRENGTH PARAMETERS FROM DIRECT SHEAR TESTS FOR SLOPE STABILITY ANALYSES IN OVERCONSOLIDATED FISSURED RESIDUAL SOILS
• DYNAMIC COMPACTION OF LOOSE AND HYDROCOMPACTIBLE SOILS ON INTERSTATE 90, WHITEHALL-CARDWELL, MONTANA
• EXPERIMENTAL ASPECTS OF MERCURY INTRUSION POROSIMETRY
• FACTORS IMPORTANT TO THE DEVELOPMENT OF FROST HEAVE SUSCEPTIBILITY CRITERIA FOR COARSE-GRAINED SOILS
• FLEXURAL FATIGUE STRENGTH OF LIME-LATERITE SOIL MIXTURES
• FROST ACTION PREDICTIVE TECHNIQUES: AN OVERVIEW OF RESEARCH RESULTS
• GENESIS AND DISTRIBUTION OF COLLUVIUM IN BUFFALO CREEK AREA, MARION COUNTY, WEST VIRGINIA
• LOCATING SUBSURFACE GRAVEL WITH THERMAL IMAGERY: PRELIMINARY RESULTS
• MEASUREMENT OF PORE-SIZE DENSITY FUNCTION IN SAND
• PERFORMANCE OF CEMENT-MODIFIED SOILS: A FOLLOW-UP REPORT
• PHYSICAL PROPERTIES OF SOUTHEASTERN WASHINGTON LOESS RELATED TO CUT SLOPE DESIGN
• SATURATION EFFECTS ON CALCAREOUS DESERT SANDS
• THE PRESSUREMETER IN GEOTECHNICAL PRACTICE
• THE SHERMAN LANDSLIDE: A CASE HISTORY
• USE OF ROTATIONAL EROSION DEVICE ON COHESIVE SOILS