A Study on the Influence of Grain-Size-Segregation on the Distributions of Gluing Solutions in a Realistic Railway Ballast

• Main Authors: Po-ChenChen, 陳柏辰
• Other Authors: Chung Fang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/jr3zp3

碩士 === 國立成功大學 === 土木工程學系 === 103 === By using the finite element code ANSYS, together with the ICEM mesh and Fluent , the final-stage solidification of anti-thixotropic and shear-thickening gluing solution in realistic railway ballast is studied. Two-fold ballasts are taken into account:uniformly distributed ballast and the gravel- and shape- induced ballast, resulted from the mechanical vibration of track and sleepers.Results show that uniformly distributed ballast assumes better gluing solution solidification in the upper and lower parts than the segregated ballast, while the gluing solution distributions in the central part are almost the same in two-fold ballasts.this results from the gravel segregation and the time-dependent viscosity of the gluing solution.Mesh-distributed gluing solution arrange can create more concrete vertical and lateral gluing solution solidification than the matrix arrangement in two-fold ballasts. Moreover,increasing the amount of the gluing solution can enhance the gravel solidification. The present study provides an integrated method to estimate the optimal gluing solution distribution a priori gluing practice.