Influence of Water Content on Shear Behavior of Unsaturated Fouled Ballast

详细信息    查看全文

• 作者：Tatsuya Ishikawa^a ; ^{t-ishika@eng.hokudai.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Shinji Fuku^a ; Takahisa Nakamura^b ; Yoshitsugu Momoya^b ; Tetsuya Tokoro^c
• 关键词：railroad ballast ; unsaturated soil ; triaxial test ; water retention test ; shear strength
• 刊名：Procedia Engineering
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：143
• 期：Complete
• 页码：268-275
• 全文大小：676 K

文摘

This paper evaluates the synergistic effects of water content and fine fraction on shear behavior of unsaturated fouled ballast by performing a series of triaxial compression tests and water retention tests on fresh and fouled ballasts in unsaturated conditions. As the results, it was revealed that soil-water characteristic curves and relationships between degree of saturation and peak shear strength were seriously affected by intrusion of fouling materials into fresh ballast, and that the decreasing trend of peak strength becomes more remarkable in such a case where both water content and fine fraction increase. These results indicate that for the precise prediction of the long-term performance of transportation infrastructures and the evaluation for mechanical property of railroad ballast under repeated train passages, it is important to take into account the synergistic effects of water content and fine fraction on the deformation-strength characteristics of ballast in accordance with the degree of ballast fouling.