Development of seismic site characterization method using harmonic wavelet analysis of wave (HWAW) method

摘要

The new site characterization method using harmonic wavelet analysis of wave (HWAW) method was proposed. HWAW method based on time frequency analysis mainly uses the signal portion of the maximum local signal/noise ratio to evaluate the phase velocity and it can minimize the effects of noise. This method consists of three steps: field testing, evaluation of dispersion curve, and determination of V_s profile using single array inversion process. Field testing of this method is relatively simple and fast because one experimental setup which consists of one pair of receivers is needed to determine the dispersion curve of the whole depth. HWAW method use the near field information and can sample much deeper part of the site than the conventional phase unwrapping method. This method uses single array inversion which consider receiver location without increasing calculation time and complexities because the whole dispersion curve is determined from one experimental setup. To estimate the applicability of HWAW method, numerical simulations at layered soil and pavement profiles were performed. Field tests were also performed and shear wave velocity profiles obtained by HWAW method were compared with those by conventional SASW test and PS-suspension logging test. Through numerical simulations and field applications, the good potential of the proposed method is verified.