The Preliminary Study of the Deformation of Sand Subjected to Vertical Vibration

• Main Authors: Wen-Jie He, 何文傑
• Other Authors: Sheng-Huo Ni
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/03688353445281901115

碩士 === 國立成功大學 === 土木工程學系碩博士班 === 95 === 　　The purpose of this study is to assess the effect of dry sand （Ottawa sand, ASTM C-109）subjected to vertical vibration with different confined pressures using the Stokoe’s vertical/torsional resonant column device and windows-based RCT program. The experimental project includes three purposes: 1.To study the acceleration and strain amplitude of dry sand subjected to vertical vibration with different amplitude and frequency. 2.To study the acceleration and strain amplitude of dry sand subjected to torsional vibration with varying conditions. Then compare their result with the different resolution of vertical and torsional vibration. 3.To study the dynamic property behavior of dry sand under linear vertical vibration. 　　The specimens of all tests are made of dry tamping. The design of vertical vibration is major reference to the vibration spectrum induced by Taiwan High Speed Train in Southern Taiwan Science Park. 　　According to the results, the response of dry sand under vertical vibration is more unstable than it under torsional vibration. If the vibration frequency is not within the resonant bandwidth, the respondent acceleration will change a little, and the respondent strain will be inversely proportional to the square of frequency. The dynamic property of dry sand after linear vertical vibration doesn’t change obviously. The results of this study seem to show that the effect of the linear vertical vibration on the settlement of dry sand is not very important.