Filtration behavior of geotextile under bi-directional cyclic flow

• Main Authors: Chih-Yu Hsu, 許智育
• Other Authors: 陳榮河
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/66561258037266720260

碩士 === 國立臺灣大學 === 土木工程學研究所 === 94 === In the research on geotextiles, it has developed the retention criteria in controlling soil loss and permeability criteria to drain water effectively. But most of research considered simpler conditions rather than real conditions in the field such as bi-directional cyclic flow condition, overburden pressure, and soil gradation. In this research, a bi-directional flow apparatus is adapted to simulate in-situ conditions considering the parameters: overburden pressure, soil composition, and cyclic flow period. These parameters are changed to analyze their effect on filtration behavior. Overburden pressures selected are 70 kPa and 140 kPa. The soil samples are composed of Vietnam sand and 0-10% fine material. The four flow periods are 600, 300, 150 and 75 seconds per cycle. From comparing the results of the sand and the sand with fines, it is found that the clay content plays a very important role in filtration behavior of soil-geotextile system. The flow period may change the filtration behavior that affected by overburden pressure and clay content. In addition to that, the retention and permeability criteria are also examined and suggestions from this research are made.