Coupled Procedure for Elastic Modulus and Damping Ratio Measurement on Pavement Subgrade Structures Using Surface Wave Method

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by Sri Atmaja P. Rosyidi, Ass. Professor, Department of Civil Engineering, Universitas Muhammadiyah Yogyakarta, Bantul, Yogyakarta 55183, Indonesia.,,
Mohd.Raihan Taha, Professor; Department of Civil and Structural Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia.,,

Document Type: Proceeding Paper

Part of: Contemporary Topics on Testing, Modeling, and Case Studies of Geomaterials, Pavements, and Tunnels:

Abstract: Limited financial capability of governments for road rehabilitation in developed countries and technical constraints of laboratory tests in assessing pavement quality highlight the need to develop an innovative technique in pavement evaluation. The performance of the Spectral-Analysis-of-Surface-Wave (SASW) method to evaluate the dynamic parameters on the existing road pavements is presented herein. The aim of this paper is to propose a coupled analyses procedure for calculating elastic modulus and damping ratio of soil subgrade layer in pavement. The dynamic elastic modulus was obtained from the shear wave velocity produced from the inversion of an experimental dispersion curve. To validate the modulus obtained from the SASW method, the falling weight deflectometer (FWD) test was used to determine the subgrade modulus at same sites. In this study, a damping ratio of soil layer was also obtained using attenuation coefficient from the modified Bornitz equation. Good agreements were also obtained between the attenuation coefficients from this study and previous studies. The SASW method is able to characterize adequately the in-situ pavement stiffness which can be potentially developed as an innovative evaluation device.

Subject Headings: Surface waves | Wave measurement | Elastic analysis | Elasticity | Coupling | Subgrades | Pavements | Damping | Soil modulus | Soil analysis | Innovation | Laboratory tests | Highways and roads |

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