碩士 / 國立臺灣海洋大學 / 河海工程學系 / 100 / In this study, the Kaohsiung Harbor Intercontinental Container Center for the study area with seismic and ocean wave conditions to explore. The testing sample to the center of the coast of Kaohsiung Intercontinental Container depth 23.5m drilling soil sample-based and seismic force cycle measured wave data to be tested in order to understand the sea-bed soil stability under seismic and wave action. In order to understand the different external force to the sea bed soil strength changes in the real situation, this study uses the seabed soil test and use the water rainstorm drop way for the production of specimens to simulate the deposition arranged in the case of sea-bed soil depth z = 3 m . In this study, cyclic triaxial analog seismic forces and wave forces, combined with the torsional shear stress test, the Research and Analysis of pore water pressure to stimulate the situation now to the seabed soil liquefaction resistance threshold, and the establishment of the liquefaction potential assessment methods of this study.
This study investigates the use of Stoke's second-order wave theory calculation from wave pressure, triaxial axial combination of the torsional shear stress test (simulation of wave forces combined with the torsional shear stress); and the use of cycle 1 second under the conditions in the period of 12 seconds three-axis axial test (simulated seismic forces). By the different test results analysis to investigate the pore water pressure to stimulate the behavior, the existing soil liquefaction resistance threshold, as well as its assessment of soil liquefaction potential.
The combination of torsional shear test results by the seismic forces and wave forces, Seed (1976) and Chang (2004) pore water pressure excitation mode of, in different experimental Seed (1976) may be more effective prediction of pore water pressure. Under different external test due to previous not consider the influence exerted by the torsional shear stress, pore water pressure is to stimulate the first two forecasting models have obvious gap. Liquefaction damage occurs by the liquefaction resistance curve can be learned under the same role in the number, relative to the seismic force, wave force requires a long time. This study suggests that the seismic force can be repeatedly the role of the number Nc is = 100 (times) when the now to the sea bed, anti-liquefaction threshold value of about 0.19; wave forces repeated the role of time of 1200 seconds when the now to the sea bed, anti-liquefaction threshold value of about 0.20 as Kaohsiung waters, the seabed liquefaction resistance threshold. In this study, the Construction and Planning Agency building the basis of structural design specifications Seed et al (1971) simplified method and harbor structures design criteria (2005) to estimate the force of the earthquake, it is recommended that the ground acceleration Amax halved, the theoretical assessment of the results of the research trials liquefaction damage the results of the comparison are obtained with this study, test results are the same. In this study, Chen and Yang (1996) assessment methods, and draw the depth of the seabed under wave action soil shear stress diagram, obtained here for the greatest possible depth of liquefaction beneath the surface of the sea-bed 4.57m, and the establishment of the seabed soil liquefaction potential assessment methods to assess the depth of the seabed by the wave force under the seabed liquefaction damage may occur.
| Identifer | oai:union.ndltd.org:TW/100NTOU5192041 |
| Date | January 2012 |
| Creators | Bao-Ching Chen, 陳保慶 |
| Contributors | Prof.Lien-Kwei CHIEN, 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 | 156 |
Page generated in 0.0015 seconds