| Summary: | 碩士 === 國立成功大學 === 水利及海洋工程學系 === 107 === The simplified empirical method is most used in assessing the soil liquefaction potential. However, these methods were constructed based on the onshore earthquake disaster and field tests, and its feasibility for assessing seabed soil liquefaction remains to be confirmed. This study obtained the field ground investigation data and assess the soil liquefaction potential with the simplified empirical method (NJRA and NCEER method). The NJRA assessment results show that the surface soil layers of both boreholes are nonliquefiable.The NCEER assessment results show that soil liquefaction might occur at the depth between 2 m and 3 m of the borehole BH02 and at the depth between 7 m and 10 m of borehole BH03.In this study, the cyclic strength of CL-1 and CL-2 undisturbed soil sample and remolded soil sample were obtained by the cyclic triaxial test. The test results show that the cyclic strength of undisturbed soil samples is greater than that of remolded soil samples. The results are consistent with the literature. According to the research of Chang (2017), the engineering soil type of CL-1 and CL-2 soil are medium-dense sand S3. In this study, the cyclic simple shear test was carried out on the S3 engineering soil, and the cyclic strength of the remolded S3 engineering soil was 0.103. The results in this thesis can be taken into reference at the initial phase of the development of offshore wind energy.
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