Evening Talk on Applications and Challenges of Engineering Geophysics in Geotechnical and Geo-environmental Engineering
Near surface geophysical techniques, such as travel time velocity tomography, electrical resistivity tomography, and multi-station analysis of surface wave, have advanced significantly in the last couple of decades within the scientific community. The lecture introduces the applications of these methods in Taiwan's geotechnical and geo-environmental problems, including assessment of liquefaction potential, evaluation of dam safety, investigation of soil and ground water contamination, and quality control and assurance of ground improvements. Although successful case studies and innovative applications have strengthened the contribution
of geophysics to such issues, several challenges are identified for more common practice of geophysical surveys in engineering applications from an engineer's perspective. These include the lack of standard in data reduction, non-uniqueness of data inversion, limitations of exploration depth and resolution, field conditions violating model assumptions, and the weak link between geophysical parameters and engineering parameters. Relevant researches and practical countermeasures regarding these issues are further discussed. It is hoped that more rational and wide-spread use of geophysics may be realized through the understanding of the limitations and potential pitfalls of geophysical techniques and researches to overcome them.