碩士 / 國立臺灣海洋大學 / 河海工程學系 / 102 / In this study, the study area select at offshore wind farm of Changhua Fangyuan area. Form the marine geotechnical engineering view point, based on the seismic and marine data, the different dynamic loading including seismic loading, typhoon wave loading, and monsoon wave combined with seismic loading was considered. The dynamic behavior of the seabed soil of offshore wind farm of Changhua Fangyuan
area was discussed.
In order to understand the seabed soil liquefaction behavior under different external force,the nearshore sand of Changhua Fangyuan wind farm area was adopted. The dynamic triaxial testing system was used to simulate the seismic forces, typhoon wave loading, and monsoon wave combined with seismic forces. And the excitation mechanism of pore water pressure and initial liquefaction strength were evaluated. It could be provided the reference the marine geotechnical engineering practice.
This study, the dynamic triaxial testing under the different depths and different forces were performed. From the different depths of dynamic triaxial testing results
analysis, it indicated that the initial liquefaction strength is decreasing with confining pressure increases. The cyclic axial loading and 1 sec period were selected to
simulate the seismic forces. Based on Stoke’s 2ndorder wave theory to calculate wave induced wave pressure, the cyclic axial loading and torsional loading at 12 sec period were selected to simulate typhoon wave loading. The cyclic axial loading and torsional loading at 1 sec period was selected to simulate the monsoon wave combined with seismic forces.
Form the liquefaction testing results analysis, the seabed soil of CSR is 0.185, 0.15, and 0.13 at beneath depth of -3m, -5m, and -10m. In this study, the equivalent
number of cycle (Nc) for wave loading is adopted 267 by Wen Zeng Wenqian’s (2013) suggestion. The typhoon wave induce liquefaction strength can evaluate and is about 0,085. By use of Seed (1985) suggestions Nc is 15 to evaluate the liquefaction strength induce by monsoon wave combined with seismic force is about 0.172. It could find that the liquefaction strength induces by typhoon wave loading is lowest; by monsoon wave combined with seismic force is medium, and by seismic force is highest. On the other hand, form the comparison with the different pore water excitation model analysis found the Seed (1976) mode is good suitable prediction. The study suggestion could be provided the reference of marine geotechnical engineering practice.
Keywords: Typhoon wave loading, Seismic force, Offshore wind farm, Marine cable,
Dynamic triaxial testing system, liquefaction strength of seabed soil.
| Identifer | oai:union.ndltd.org:TW/102NTOU5192081 |
| Date | January 2014 |
| Creators | Chen, Guan-Hong, 陳冠宏 |
| Contributors | Chien, Lien-Kwei, 簡連貴 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 170 |
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