00730295

Component

https://doi.org/10.3141/1540-04

http://scholar.google.com...olin&publication_year=1996

The vertical normal stress under a falling weight deflectometer (FWD) was measured in a sand. The material had more than 90% falling within the sand fraction from 60 micrometers to 2 mm. The stress was measured with three different transducers. All transducers were installed at a depth of 280 mm. The sand was uniform to a depth of 700 mm and at a distance of 600 mm to either side of the centerline. An FWD was used to exert a known vertical force on the surface of the sand, using a loading plate 300 mm in diameter. The average stress under the plate was about 300 kPa. All the loads were imposed in the centerline of the three gauges, but at different horizontal distances from FWD to transducers. An integration of the measured stress on the plane of the transducers results in a force 10 to 14% larger than the peak force exerted by the FWD. The measured force is thus reasonably close to the actual force. When the measured stress is compared with the stress predicted using Boussinesq's equation for an elastic half-space, a very large difference is observed. At the centerline of the load, the measured stress is about twice the theoretical value. This difference cannot be explained by variation in material characteristics, including nonlinearity, or by dynamic effects.

This paper appears in Transportation Research Record No. 1540, Recent Research in Pavement Performance.

English

p. 24-28

1996

Transportation Research Record

0309059208

Figures (9) ; Photos (1) ; References (5)

Alternatives analysis; Boussinesq equation; Falling weight deflectometers; Forecasting; Sand; Stresses; Transducers

Vertical stress

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways

TRIS, TRB

Dec 23 1997 12:00AM

• APPLICATION OF ARTIFICIAL NEURAL NETWORKS TO CONCRETE PAVEMENT JOINT EVALUATION
• APPLICATION OF FALLING WEIGHT DEFLECTOMETER DATA FOR ANALYSIS OF SUPERHEAVY LOADS
• APPLICATION OF STOCHASTIC FINITE-ELEMENT METHOD TO DEFLECTION ANALYSIS OF PAVEMENT STRUCTURES
• ATTEMPT AT RESILIENT MODULUS MODELING USING ARTIFICIAL NEURAL NETWORKS
• COMPARISON OF SIMPLIFIED ELASTOSTATIC AND ELASTODYNAMIC MODELS FOR FALLING WEIGHT DEFLECTOMETER DATA INTERPRETATION
• DETERMINATION OF ELASTIC AND PLASTIC SUBGRADE SOIL PARAMETERS FOR ASPHALT CRACKING AND RUTTING PREDICTION
• ESTABLISHING THE CALIFORNIA DEPARTMENT OF TRANSPORTATION ACCELERATED PAVEMENT TESTING PROGRAM
• EXPERIMENTS WITH COLD MIXES ON LABORATOIRE CENTRAL DES PONTS ET CHAUSSEES FATIGUE TEST TRACK: BEHAVIOR UNDER TRAFFIC LOADS, MECHANICAL CHARACTERISTICS, AND MODELING
• FIELD VERIFICATION OF MOVING LOAD MODEL FOR PAVEMENT RESPONSE
• IMPACT OF HIGH-PRESSURE TIRES AND SINGLE-TIRED AXLES IN OREGON
• PLASTICITY MODELING APPLIED TO THE PERMANENT DEFORMATION RESPONSE OF GRANULAR MATERIALS IN FLEXIBLE PAVEMENT SYSTEMS
• PREDICTION OF PAVEMENT FATIGUE FOR CALIFORNIA DEPARTMENT OF TRANSPORTATION ACCELERATED PAVEMENT TESTING PROGRAM DRAINED AND UNDRAINED TEST SECTIONS
• PROBABILISTIC FINITE-ELEMENT ANALYSIS OF AIRFIELD PAVEMENTS
• RATIONAL SELECTION OF FACTORS OF SAFETY IN RELIABILITY-BASED DESIGN OF FLEXIBLE PAVEMENTS IN SAUDI ARABIA
• REVISED PREDICTIVE MODEL FOR DYNAMIC (COMPLEX) MODULUS OF ASPHALT MIXTURES
• ROLLING WEIGHT DEFLECTOMETER WITH THERMAL AND VIBRATIONAL BENDING COMPENSATION
• STATISTICAL ANALYSES OF TEMPERATURE AND MOISTURE EFFECTS ON PAVEMENT STRUCTURAL PROPERTIES BASED ON SEASONAL MONITORING DATA