| Summary: | 碩士 === 國立交通大學 === 土木工程系 === 91 === One of the most important tasks of geotechnical engineers is to provide geotechnical information of a site for later design and construction. Geotechni-
cal engineers rely on readily available knowledge on the site and data from field investigations to provide such information. In the process of gathering informa-
tion and production of a site investigation report, geotechnical engineers have to make a lot of use of professional judgment. The major sources of the uncertainty which forces the engineers to exercise judgment are the complexity of the geological conditions and the heterogeneous nature of the geomaterials. On the other hand, the uncertainty further accumulates when the geomaterials go through in-situ tests, sampling, handling and transportation of the samples, and laboratory tests. Engineers who design with the parameters summarized in the reports seldom know the degree of uncertainty of these parameters. Even the geotechnical engineers that produced the report may not sure about the degree of uncertainty.
The objective of this research is to study the perception of engineers on quality of information produced in various stages of the geotechnical investigation. Questionnaires were sent to practicing civil engineers, especially, geotechnical engineers.
The results show that the average confidence level of the participants on information quality is low. The major factors affecting the confidence level of individual participants are their major fields of work and years of experience. The least and the most experienced engineers tend to have higher level of confidence. In addition, the results show that quality assurance and quality control measures are either absent or not followed in all stages of the site investigation program in most cases.
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