| Summary: | 博士 === 國立臺灣海洋大學 === 河海工程學系 === 92 === In this study, the key points are both sedimentation soil and hydraulic filled reclaimed soil in western coast of Taiwan. By using Hsin-Hsin sand and C-190 sand to perform the shear wave velocity test with traditional single and double layer in the lab, then analyze the characteristic in order to build the pattern of evaluation. This test which was based on a traditional single layer shear wave velocity by using new parameter, relative density ratio RD and soil layer depth ratio RH , to analyze the result of the variety of site-layer shear wave velocity, and further, by using the data from Down-Hole method to offer some suggestions. Including relative density, dry unit weight, Stress, test instrument, soil shape, saturation degree (B), regression, evaluation-mode, the effect of double-decked layer, Down-Hole method and soil-layer analysis.
This study has shown that by using linear and the Gibson soil to analyze the shear wave velocity, the ground on-site shear wave velocity and the shear wave velocity would greater by increasing soil-layer stress and they would cause “limit shear wave velocity” which was conform to the concept of rock-cycle. Using time-path method to analyze phenomenon of the shear wave velocity in double layer, the effect coefficient , and its enlarge effect was more obvious in the deeper layer.
The evaluation-mode of this study which was set up an simple single layer evaluation-mode, by using the ground relative density to inquire the shear wave velocities from different soil-layer depths, which utilized the ground shear wave velocity ,double-layer effect and rock-cycle concept to combine with single and double soil-layer tests then redesign these densities of the stresses, =1:1 which divided into three layers ,five shear wave velocities to set up on-site evaluation-mode. By using this method to strengthen its scope in the lab and renew the single and double layer test data.
In-site reclaimed soil is soft and weak, the SPT-N value is smaller than 10, the shear wave velocity is smaller than 150 m/s, the relative density : 20% ~ 40% .the ground and reclaimed soil depth which is around 7m, because of its lower stress, the shear wave velocity would not affect on the particle soil and its on-side data are close to the lab. In-site reclaimed soil, its increasing density would cause of the higher shear wave velocity by increasing depth, therefore, the discrepancy would be greater between the lab and on-site shear wave velocity by increasing depth.
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