Analyses on wave-induced pore pressures in fluidized seabeds

• Main Authors: wang chih ming, 王智民
• Other Authors: Shan-Hwea Ou
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/29872330900626160785

碩士 === 國立成功大學 === 水利及海洋工程學系 === 89 === This thesis primarily investigates the pore pressure responses inside the fluidized non-cohesive seabeds with a wave flume set-up. Analysis on the mean pore pressure build-up and the pressure amplitude were carried out to study interactions of wave and fluidized seabeds . A fine sand( d50 = 0.085mm) is first used as the test seabed material to investigate the soil responses after internal fluidization. The results show that pressure amplitudes amplify twice during fluidized and the phenomenon is more apparent in the initially-fluidized responses. Besides, pressure amplitudes decrease as mean pressure build-ups reduce in the fluidized stage. Pressure amplitudes is gradually become steady but their magnitudes are still larger then those before fluidization. Comparison with fluidized soil layer and the depth profiles of amplitude in Tzang’ s (1992) and Peng’ s(2000) tests, further illustrate that pore pressure amplitude would amplify after fluidization .Maximum amplitude amplification generally occur close to the bottom of fluidized layer while the depth profile of pressure amplitude is inverse to the pore-elasticity theory. After several wave-induced consecutive soil fluidization, fluidized layer gradually become shallower the pressure amplitude amplifications decrease and revert to non-fluidized mode before fluidization. As a result, this study has preliminary exploded the soil responses after fluidization in the non-cohesive seabed, thus it becomes feasible to further study the characteristics of interactions of waves and fluidized seabeds in the future.