碩士 / 國立臺灣海洋大學 / 河海工程學系 / 93 / Under the ocean wave actions, the seabed soil is subjected to the dynamic interactions from both vertical, horizontal and pore pressures. In order to investigate the dynamic strengths of seabed soil, a triaxial cyclic testing system (TCTS) was established and the cylindrical samples were used in the tests.
By adding the manual pressure adjusting valves and the dynamic control mechanism of back pressure(pore pressure), upper-drained volume meter and partial drain adjusting valve to the CKC triaxial testing system, the system can automatic control the dynamic stresses in all axes, and can simulate the partial drain conditions. Labview software and AD/DA card were employed in automatic control, calibration, data acquisition and data analysis software. With this testing system, many soil tests can be processed, through the selectable uniform, K0 and arbitrary K consolidations, including drain test, static, dynamic axial load, dynamic axial load and confined pressure, and dynamic axial load, confined and pore water pressures triaxial tests. The dynamic stresses can be either the build-in sine waves or imported arbitrary wave forms to simulate irregular wave actions. Time delay between any two dynamic loads is selectable to simulate the phase shifting between each pair of stresses.
From the dynamic axial load test results under the same test conditions, the new TCTS system was proved to have good consistency with CKC triaxial testing system. However, from the results of dynamic axial load tests and dynamic axial load and confined pressure tests of the TCTS system, the soil dynamic strengths were found to be different which showed that the interaction between axial load, confined and pore water pressures should be taken into account when studying the dynamic seabed soil strength under the wave actions.
| Identifer | oai:union.ndltd.org:TW/093NTOU5192077 |
| Date | January 2005 |
| Creators | Shih-Yu Hsu, 許師瑜 |
| Contributors | 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 | 132 |
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