Experimental Evaluation of Variables Affecting the Testing of Pavements by the Spectral-Analysis-of-Surface-Waves Method
Abstract
The spectral analysis of surface waves (SASW) method is a testing procedure for determining in situ stiffness profiles of multi-layered elastic systems, e.g., soil, pavements. The method is nondestructive, is performed from the surface, and requires no boreholes. Measurements are made at strain levels below 0.0001 percent, where elastic properties are considered independent of strain amplitude. The key elements in SASW testing are generation and measurement of surface waves, i.e., Rayleigh waves. A number of case studies have been conducted employing the SASW method. The results have been compared with the results from crosshole tests performed independently at the same location. Generally, the shear wave velocity and modulus profiles from the two methods compare closely. The major disadvantage of the method at this time is that the testing and data reduction procedures are too time-consuming. The purpose of this research was to further the development of the SASW method toward a practical technique for in situ investigation of pavement systems. It is envisioned that eventually an automated testing procedure will be developed to enable one to quickly collect the necessary field data. It was felt that the development of a multiple transducer testing procedure was an important step towards the development of an automated testing method. In particular, this research examined the influence of source and receiver geometry, source-to-near- receiver distance, and source type in the context of a multiple transducer testing procedure at two asphaltic concrete pavement sites.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1988
- Accession Number
- ADA199281
Entities
People
- Dennis R. Hiltunen
Organizations
- University of Michigan