Use of surface waves techniques for the identification of shallow rock

Friederike Wulff, University of Rhode Island


Knowing the depth to bedrock is important in designing and constructing foundations for buildings and transportation infrastructure. Rock is typically a strong and competent foundation material, however if it is close to the ground surface it can be costly to remove. This is especially true if the presence of shallow rock is not known until construction. In many transportation projects where geotechnical borings are widely spaced along a road alignment, areas of shallow rock can be easily missed until construction of drainage structures beneath the road. More research is needed on the viability of cost eective tools to identify the presence of shallow rock before construction. Non-destructive evaluation (NDE) techniques to characterize the stiness of soils may be a good tool for this problem. Spectral Analysis of Surface Waves (SASW) is a wave propagation method in which vertical shear wave velocity proles and elastic moduli of subsurface layers of soil and rock can be estimated. The proles are obtained from the analysis of surface wave data, usually generated from a falling weight and measured by an array of two or more geophones. The objective of this thesis is to evaluate the eciency of the SASW system for use in transportation projects in Rhode Island. It will focus on the identication of shallow rock for aid in construction of drainage structures.^

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Recommended Citation

Friederike Wulff, "Use of surface waves techniques for the identification of shallow rock" (2016). Dissertations and Master's Theses (Campus Access). Paper AAI10142873.