شبكة التخطيط العمراني بسم الله الرحمن الرحيم
للكاتبين
M.R. Taha∗, S.A. Rosyidi‡, A. Ismail∗ & Z. Chik∗
∗Department of Civil & Structural Engineering, Faculty of Engineering
Universiti Kebangsaan Malaysia, , Selangor, Malaysia
‡Department of Civil Engineering, Faculty of Engineering
Muhammadiyah University of Yogyakarta, , Indonesia
ABSTRACT
The knowledge of the in-situ strength and stiffness of the ground is normally required for monitoring
and evaluation of pavement subgrade layer to ensure an adequate margin of safety. In order to estimate
the dynamic stiffness of the pavement subgrade a method called the spectral analysis of surface
wave (SASW) has been developed. The method consists of generation, measurement and processing
of the dispersive Rayleigh waves recorded on two vertical transducers. Subsequently, an inversion
process is carried out to obtain the shear wave velocity versus depth profile of the site from dispersive
Rayleigh wave data. The results presented in this paper showed that the SASW method is able to reliably
determine the seismic parameter, i.e. the dynamic shear modulus of the soil subgrade layer of
the pavement profile. In situ subgrade bearing capacity test using the field CBR test was also carried
out in the same location of the SASW test. An empirical relationship between the CBR and the dynamic
shear modulus from the SASW measurements was also established for bearing capacity measurement
in the pavement system. Results showed that the empirical model is statistically valid with
excellent correlation coefficient.