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USE OF SPECTRAL ANALYSIS OF SURFACE WAVES METHOD FOR DETERMINATION OF MODULI AND THICKNESSES OF PAVEMENT SYSTEMS.
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1983
Year
Highway PavementPavement EngineeringEngineeringSeismic WaveSurface WavePavement DesignStructural EngineeringGeotechnical EngineeringModal AnalysisPavementsSeismic AnalysisEarthquake EngineeringReinforced ConcreteStructural Health MonitoringElastic ModuliSeismologySeismic Reflection ProfilingCivil EngineeringReinforced Concrete PavementGeomechanicsSpectal Analysis
The spectal analysis of surface waves (SASW) is a nondestructive technique for measuring pavement moduli and layer thicknesses. By striking the pavement surface, a spectrum of waves is generated and their phase differences recorded at two surface receivers, allowing calculation of seismic velocities, elastic moduli, and layer thicknesses for asphaltic concrete, reinforced concrete, and natural soil, and comparison with crosshole and Dynaflect data. SASW offers a unique, fully automated, nondestructive solution; field tests on TX‑71 confirm its moduli agree with crosshole measurements, while Dynaflect results are less favorable.
The spectal analysis of surface waves (SASW) method is a nondestructive method for determining moduli and thicknesses of pavement systems. By means of a transient impact on the surface of a pavement system (or soil deposit), a group of waves with different frequencies is transmitted to the medium. Seismic wave velocities and, eventually, elastic moduli and thicknesses of the various layers in the pavement system are determined from analysis of the phase information for each frequency determined between two receivers located on the surface. The method has several advantages: it is nondestructive, has a unique solution, and is capable of full automation. The results of three series of tests performed on TX-71 near Columbus, Texas, are presented. Testing was performed on an asphaltic concrete pavement, a continuously reinforced concrete pavement, and a natural soil occupying the median at the site. Elastic moduli determined by using the SASW method are compared with those determined by means of crosshole seismic tests and Dynaflect measurements. Moduli determined by the SASW method are in agreement with those from crosshole tests, whereas moduli back-calculated from Dynaflect measurements compare rather unfavorably with moduli determined by the other two methods.