| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 95 === In recent years, geotechnical engineers have paid much attention on reliability-based design. The probability density functions (PDFs) of the uncertain soil parameters are required for the reliability-based design. Once these PDFs are obtained, reliability analysis can be conducted, and reliability-based design can be achieved. Among the soil parameters, some of them play important roles in geotechnical design; we call these parameters as “key parameters”, e.g. friction angle of sand and undrained shear strength of clay. It is essential to obtain the PDFs of the key parameters for reliability-based design. How to obtain those PDFs based on all available information is an important research subject. Of course, we can establish the PDFs of the key parameters based on results from sophisticated laboratory tests, e.g. drained test for sand to obtain its friction angle, but those tests are expensive and time consuming. On the other hand, in-situ tests are quick and convenient, but they do not provide direct information on the key parameters. Nevertheless, they do usually provide indirect information of the key parameters by correlation, e.g. SPT-N is positively correlated to friction angle of sand, and plasticity index (PI) is also related to undrained shear strength of clay. Therefore, it is possible to update the PDFs of the key parameters by using the in-situ test data.
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