00457443

Component

http://onlinepubs.trb.org...trr/1985/1022/1022-002.pdf

https://scholar.google.co...Shao&publication_year=1985

The Dynaflect and the falling weight deflectometer are commonly used for nondestructive testing of pavements. In both cases a dynamic load is imparted, and the determination of the mechanical properties of the pavement, the base, and the subbase is normally performed by comparing the measured deflections at various points along the surface to results of static analyses that consider the subbase as a homogeneous, elastic half-space. In this paper, the displacements obtained from dynamic analyses are compared to those provided by conventional static programs when the subbase is a homogeneous soil stratum of finite depth resting on a much stiffer rocklike material and when the soil properties increase smoothly with depth, as is often the case. The results of these comparisons indicate that for certain ranges of depth to bedrock a static interpretation of the Dynaflect and falling weight deflectometer tests may lead to substantial errors. Situations in which these errors are important are more likely to be encountered with the Dynaflect than with the falling weight deflectometer.

Publication of this paper sponsored by Committee on Mechanics of Earth Masses and Layered Systems. 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

01419404

pp 7-16

1985

Transportation Research Record

0309039118

Print

Figures (15) ; References (9) ; Tables (3)

Deflection; Depth; Dislocation (Geology); Dynaflect; Dynamic tests; Falling weight deflectometers; Pavements; Subbase (Pavements)

Dynamic analysis; Subbase

Geotechnology; Highways; Pavements; I42: Soil Mechanics

TRIS, TRB

Aug 31 1987 12:00AM

• ANALYSIS OF TRACK SUPPORT AND DETERMINATION OF TRACK MODULUS
• Analytical-Empirical Pavement Evaluation Using the Falling Weight Deflectometer
• APPLICATION OF SIMPLIFIED LAYERED SYSTEMS TO NDT PAVEMENT EVALUATION
• AUTOMATED CONE PENETROMETER: A NONDESTRUCTIVE FIELD TEST FOR SUBGRADE EVALUATION
• BEHAVIOR OF STABILIZED LAYERS UNDER REPEATED LOADS
• CHARACTERIZATION OF GRANULAR MATERIAL
• EVALUATION OF PAVEMENT SUBGRADE SUPPORT CHARACTERISTICS BY DILATOMETER TEST
• FAILURE CRITERIA AND LATERAL STRESSES IN TRACK FOUNDATIONS
• FLAT DILATOMETER AND LATERAL SOIL MODULUS
• MEASUREMENT AND PREDICTION OF VERTICAL TRACK MODULUS
• MODELING OF GRANULAR MATERIALS IN PAVEMENTS
• NEW METHOD OF SIMULATING LAYERED SYSTEMS OF UNBOUND GRANULAR MATERIAL
• PAVEMENT DESIGN BASED ON SHAKEDOWN ANALYSIS
• Pavement Evaluation Using Deflection Basin Measurements and Layered Theory (Discussion and Closure)
• PAVEMENT FAILURE INVESTIGATION: CASE STUDY (ABRIDGMENT)
• RAPID DETERMINATION OF BASE COURSE STRENGTH USING THE CLEGG IMPACT TESTER
• THEORETICAL RESPONSE OF MULTILAYER PAVEMENT SYSTEMS TO DYNAMIC NONDESTRUCTIVE TESTING