The use of 3-D and 2-D seismic tomography for assessing the physical integrity of building panels

摘要

This paper describes an application of 3-D seismic tomography for evaluating the inner structure of some building panels. The measurements were performed on two building panels that had been expressly constructed using the building techniques of the ancient Romans. The study was made to assist the design of restoration work on ancient Roman monuments, and walls in particular. The aim of the survey was to assess whether the seismic tomography technique could be used to determine the elastic properties of brick walls and how these might vary when the walls are subjected to different loads. Different loads were applied to both building panels and seismic tomographic images were obtained for each loading. By noting the changes in elastic properties, it was hoped to predict the onset of cracks or fractures. For the first wall, images were obtained for two load phases. On the second wall, the experiment was conducted for only one loading. The study showed that it was possible to identify variations in seismic velocity caused by the applied loads and to predict the zones that were going to fracture. The inversion algorithm used was based on the LSQR method.