铁道科学与工程学报2017，Vol.14Issue(11)：2339-2344,6.
无砟轨道膨胀土地基的泥岩膨胀变形试验
Expansive deformation test on ballastless track of expansive mudstone
摘要
Abstract
Mudstone with low clay mineral content that is considered to be non-expansive in the existing railway codes is in fact expansive. The deformation of expansive mudstone is destructive potentially for ballastless track of high-speed railway that has stringent requirement for deformation. This paper took the second line of Lanzhou to Xinjiang Railway as the research object that exhibits heaving distress on the foundation of low clay minerals content of mudstone. Comparative experiments of non load expansion of undisturbed and reconstructed soils under different soil sample thickness and different water content were carried out. Experimental results show that the expansive soil swelling process can be divided into three stages, i.e., the stage of accelerating expansion of water absorption, the stage of slow expansion, and the stage of final stability. Under the same conditions, the amount of reconstructed soil's expansion is larger than that of undisturbed soil. Compared with the reconstructed soil, the water absorption of undisturbed soil is slower. When the proportion of soil sample thickness increases, the final expansion volume is not increased in proportion. According to the experimental results, the formula of the ratio of the volume of the undisturbed soil and the reconstituted soil considering the water content and the thickness of the soil sample was fitted.关键词
无砟轨道/泥岩/低黏土矿物/膨胀量Key words
ballastless track/mudstone/low clay mineral/expansion volume分类
建筑与水利引用本文复制引用
崔晓宁,王起才,张戎令,王冲,薛彦瑾..无砟轨道膨胀土地基的泥岩膨胀变形试验[J].铁道科学与工程学报,2017,14(11):2339-2344,6.基金项目
长江学者和创新团队滚动支持发展计划资助项目(IRT_15R29) （IRT_15R29）
中国铁路总公司科技研究计划资助项目(Z2015-G001) （Z2015-G001）
中国科协青年人才托举工程资助项目 （）
