00802455

Component

https://doi.org/10.3141/1716-05

http://scholar.google.com...+Joh&publication_year=2000

The spectral analysis of surface waves (SASW) method is an in situ seismic technique that is used for evaluation of the stiffnesses of pavement systems at low strain levels. The stiffness of the surface layer can be determined by direct measurements in the field. Stiffnesses of the layers beneath the surface layer require forward modeling of SASW field data in order for the pavement profile to be obtained. The forward modeling process can be time consuming, especially if a three-dimensional model is used. A simplified procedure is proposed for determining an average value of the subgrade stiffness without performing forward modeling. Additionally, the simplified procedure can be used for determining the depth of shallow bedrock beneath pavement sites. The recommended procedure is based on SASW tests performed at 24 flexible pavement sections in the state of Texas. Parametric studies were also conducted with idealized rigid and flexible pavement profiles for the purpose of verifying the accuracy of the procedure and evaluating its limitations. An important point is that SASW measurements associated with the simplified procedure can be performed in conjunction with falling weight deflectometer (FWD) measurements using the drop weight as a source. The drop-weight source generates the frequency range required for SASW receiver spacings of 3, 6, and 9 m, which are recommended in the simplified procedure. The subgrade stiffness and depth to bedrock (if it exists) determined by the simplified procedure can be used as input parameters for enhancement of the backcalculation procedure associated with FWD measurements.

This paper appears in Transportation Research Record No. 1716, Pavement Assessment and Testing.

English

p. 40-48

2000

Transportation Research Record

0309066956

Figures (11) ; References (18) ; Tables (1)

Backcalculation; Bedrock; Depth; Falling weight deflectometers; Flexible pavements; Spectrum analysis; Stiffness; Subgrade (Pavements)

Spectral analysis of surface waves

Texas

Data and Information Technology; Highways; Pavements; I23: Properties of Road Surfaces

TRIS, TRB, ATRI

Nov 6 2000 12:00AM

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• BACKCALCULATION OF THERMALLY DEFORMED CONCRETE PAVEMENTS
• CURVILINEAR BEHAVIOR OF BASE LAYER MODULI FROM DEFLECTION AND SEISMIC METHODS
• DYNAMIC INTERPRETATION OF FALLING WEIGHT DEFLECTOMETER TEST RESULTS: SPECTRAL ELEMENT METHOD
• EFFECT OF MOISTURE ON MODULUS VALUES OF BASE AND SUBGRADE MATERIALS
• EVALUATING MEASURED TIRE CONTACT STRESSES TO PREDICT PAVEMENT RESPONSE AND PERFORMANCE
• EVALUATING RUNWAY PAVEMENTS AT SEATTLE-TACOMA INTERNATIONAL AIRPORT: CONTINUOUS DEFLECTION PROFILES MEASURED WITH THE ROLLING DYNAMIC DEFLECTOMETER
• IT'S 10 O'CLOCK: DO YOU KNOW WHERE YOUR SENSORS ARE?
• PERFORMANCE OF SUPERPAVE MIXTURES UNDER ACCELERATED LOAD TESTING
• PERFORMANCE PREDICTION OF LOUISIANA ACCELERATED LOADING FACILITY TEST SECTIONS
• RUTTING OF THIN PAVEMENTS: FULL-SCALE STUDY
• SUPER-ACCELERATED TESTING OF FLEXIBLE PAVEMENT WITH STATIONARY DYNAMIC DEFLECTOMETER
• TEMPERATURE CORRECTION ON FALLING WEIGHT DEFLECTOMETER MEASUREMENTS
• TRUCK TRAVEL TIME AROUND WEIGH STATIONS: EFFECTS OF WEIGH IN MOTION AND AUTOMATIC VEHICLE IDENTIFICATION SYSTEMS
• USING A ROAD SURFACE ANALYZER TO EXPLAIN NOISE CHARACTERISTICS OF PORTLAND CEMENT CONCRETE PAVEMENT SURFACE TEXTURE
• USING TRANSVERSE PROFILE DATA TO COMPUTE PLASTIC DEFORMATION PARAMETERS FOR ASPHALT CONCRETE PAVEMENTS