INVESTIGATION OF FLASH X-RAY TECHNIQUES IN SOIL DYNAMICS AND INTERACTION PROBLEMS
Technical rept. Mar 1963-Feb 1966
NEW MEXICO UNIV ALBUQUERQUE ERIC H WANG CIVIL ENGINEERING RESEARCH FACILITY
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This research was conducted to assess the utility of flash X-ray techniques in soil dynamics studies. Areas where these techniques should be successful, their limitations, and the type of information to be expected from them are discussed. Static and dynamic tests were conducted on soil samples of various thicknesses and densities, and on buried structures of various dimensions. Initial tests defined the proper techniques to record pictures under optimum conditions of exposure, scatter elimination, and sample size and density. Final tests showed that qualitative information could be collected on certain loose soils and that interaction problems could be designed to yield large deformations. Soil thicknesses of over five inches could not be penetrated satisfactorily. However, recent preliminary tests June 1965 were made through eight inches of soil. It was concluded that 1 direct recording on film instead of using an image intensifier provides better contrast, field of view, and resolution, but problems of intensity and film transportation are great 2 more refined techniques and improvements are needed to collect quantitative information and 3 the inadequate state-of-the-art in multiple flash X rays at the time of this research limited their utility in soil dynamics. Further investigation is recommended based on recent and significant developments in field-emission X-ray-type systems.
- Soil Mechanics