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- W655430768 abstract "The Spectral-Analysis-of-Surface-Waves (SASW) method has been used as a nondestructive test method for determining elastic modulus profiles of pavement systems. To perform the test, a disturbance is applied to the pavement surface to generate stress waves which propagate mostly as surface waves of various wavelengths. The waves are monitored and captured with a data acquisition system. Signal and spectral analyses are utilized to determine a dispersion curve (variation in phase velocity with wavelength). To implement the method in day-to-day activities of any pavement evaluation program, three steps are necessary. First, field data acquisition should be carried out rapidly. This has been achieved by utilizing a newly-developed device called the Seismic Pavement Analyzer (patent pending). Second, the raw data should be manipulated to a dispersion curve in an automated manner. An algorithm has been developed which can perform this task. The last step is to determine the elastic modulus of different layers from the dispersion curve. Several alternatives are available. First, trial and error (forward modelling) process can be carried out. Second, optimization techniques can be utilized. Finally, generalized inverse theory can be implemented. In most applications, the backcalculation of layer moduli is accomplished using a manual trial and error matching process between the theoretical and experimental dispersion curves. Unfortunately, this process is rather time-consuming and requires engineering judgement. To improve this aspect of SASW testing, a backcalculation technique based upon the generalized inverse theory is developed. The technique provides a fast and automated procedure for simultaneously determining layer elastic moduli and thickness of pavements. In addition, some description of uncertainty in the backcalculated results is provided. In this report, the development of these algorithms are discussed. The speed and accuracy as well as the limitations of the algorithms are demonstrated. Several actual field case histories are included to exhibit the usefulness of the method in actual field testing." @default.
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- W655430768 date "1995-11-01" @default.
- W655430768 modified "2023-09-27" @default.
- W655430768 title "Rapid determination of moduli with spectra-analysis-of-surface-waves method" @default.
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