铁道标准设计Issue(9)：9-12,13,5.DOI:10.13238/j.issn.1004-2954.2015.09.002
改良粗颗粒填料在寒区高速铁路路基中的应用研究
Application Research on Improved Coarse Grain Filling Material for High Speed Railway Subgrade in Cold Regions
摘要
Abstract
The traditional well graded filling material with average frost heaving ratio η≤1% is used in the high speed railway subgrade, and the actual frost heaving value has exceeds the requirements for high speed railway subgrade of less than 15 mm. The paper aims focuses on the frost heaving of high speed railway subgrade in cold regions and the improved subgrade filling materials. The graded gravel mixed with cement, lime and fly ash is selected based on the main frost heaving location of subgrade. Through indoor experiments, the change of permeability and frost heaving properties after adding inorganic materials are analyzed and the frost heaving ratios with three admixtures are compared. Thus, the material with best improved effect is selected as the improved material for high speed railway subgrade in cold regions. The research results show that cement, lime and fly ash can greatly reduce the seepage of water from the surface of subgrade to the interior. The fly ash shows great capacity in absorbing water, and results in large amount of frost heaving, being not suitable as the improved material. The moisture migration and amount of frost heaving reduced in the graded gravel mixed with cement. Compared with lime and fly ash, cement is the most suitable material to be mixed with graded gravel to reduce frost heaving.关键词
高速铁路/级配碎石/改良填料/冻胀Key words
High speed railway/Graded gravel/Improved filling material/Frost heaving分类
交通工程引用本文复制引用
金兰,程佳,朱兆荣,唐彩梅..改良粗颗粒填料在寒区高速铁路路基中的应用研究[J].铁道标准设计,2015,(9):9-12,13,5.基金项目
中铁西北科学研究院有限公司创新课题(K2014009) （K2014009）
