The Study of the Dynamic Behavior of Seabed Soil by Torsional Shear Stress under Typhoon Wave Loading

• Main Authors: Ho-Chieh Chan, 詹賀傑
• Other Authors: Lien-Kwei CHIEN
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/85298776238098694134

碩士 === 國立臺灣海洋大學 === 河海工程學系 === 96 === When the wave progressive will be transmitted in the sea bed and induce the dynamic pressure. The wave induced pressure could be transmitted to the soil of sea bed, and will induce the vertical stress, horizontal stress, pore water pressure and influence of torsion shear stress at the same time. The soil of sea bed will become unstably under wave loading. In order to deep understanding and simulation the true behavior of sea bed soil under wave loading, the purpose of this study is try to establishment the modified tri-axial cyclic triaxial testing system(TCTS) jointed with the torsion shear stress function. The development of testing system could be simulated the results for situ wave loading condition. The triaxial cyclic testing system(TCTS) combine with the function of torsion shear stress, it can be controlled all kinds of stress conditions, included the axial, confining pressure and back water pressure, and torsional shear stress by the data acquisition system. Based on the soil property of the sea bed area and wave loading conditions near the harbor of Taichung, this system could be set and control to simulate the stress condition automatically. In this study, the four different of wave induced pressure such as the wave pressure induce by the typhoon induce wave break point, the wave pressure induce by the typhoon and season wave, season wave induce pressure and wave induced wave break point, were discussed to evaluate the various difference with vertical stress, torsional shear stress, and pore water pressure of the sea bed soil under the different depths and wave loading. From the results of axial and torsional shear tests under wave pressure induce by typhoon induce wave break point, it could be indicated that axial tests was exciting pore water pressure immediately tendency and torsional test was exciting pore water pressure slowly tendency. Based on this study establishment of triaxial cyclic testing system jointed with function of torsional shear stress and initial testing results, it could be provided the later reference of dynamic behavior of sea bed soil under wave loading.