Comparison Of MASW And MSOR For Surface Wave Testing Of Pavements
S. Lin and J.C. Ashlock
Event name: 27th Annual Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP)
Session: I2 NDE&T for Bridges and Concrete Structures
Publication date: 16 March 2014
Info: Extended abstract, PDF ( 648.68Kb )
This paper presents a computational and experimental study on seismic stiffness profiling of pavements using the multi-channel analysis of surface waves (MASW) and multi-channel simulation with one receiver (MSOR) testing procedures. Development of a new custom-programmed data acquisition system for MASW and MSOR testing using MATLAB software and National Instruments hardware are detailed. Effects of different receiver coupling methods on the test results are examined. The cross-correlation function is employed to statistically quantify the repeatability of impacts, which is critical for MSOR tests in which multi-channel records are simulated by performing multiple impacts over a range of incremental offsets from a single fixed receiver. Experimental dispersion data from MASW and MSOR tests performed at the same site with the same testing system are compared, and MASW is found to enable measurement of dispersion data to much higher frequencies than MSOR. Inversion results from MASW and MSOR data at the same site are compared, and it is found that MASW is able to provide measurements of the stiffness of the surface layer with reduced variability.