文献类型：期刊文献

英文题名：Characteristics and controlling factors of frost heave in high-speed railway subgrade, Northwest China

作者：Lin, Zhanju[1];Niu, Fujun[1];Li, Xiaolong[2];Li, Anyuan[3];Liu, Minghao[1];Luo, Jing[1];Shao, Zhujie[2]

机构：[1]Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China;[2]First Railway Survey & Design Inst China, Xian 710043, Shaanxi, Peoples R China;[3]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China

年份：2018

卷号：153

起止页码：33

外文期刊名：COLD REGIONS SCIENCE AND TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000439349800005)、、EI(收录号：20182205247815)、Scopus(收录号：2-s2.0-85047437650)、WOS

基金：This work was supported by the Technology Service Network Initiative (No. KFJ-STS-ZDTP-037), and the Scientific Research Project of China Railway First Survey and Design Institute Group (No. 2016-16-11). We thank some workers, X.T. Feng, Y.H. Tang, et al., who drilled boreholes and installed the sensors in field, especially worked at night, and S.G. Yang who tested the soil samples in laboratory. We would like to thank the editor and the anonymous reviewer who provided insightful suggestions, and Brendan O'Neill for his assistance with editing of the paper and with the English.

语种：英文

外文关键词：Frost-heave; Subgrade; High-speed railway; Seasonal frozen cold regions; Northwest China

外文摘要：Frost-heave of the subgrade significantly influences the stability of transportation infrastructure. In particular, small amounts of frost heave in coarse-grained subgrade fill may pose challenges to the safe operation of highspeed railway lines in cold regions. In this study, frost heave, ground temperatures, and soil moisture contents were examined at 15 test sections along Lanzhou-Xinjiang high-speed railway (LXHR), and the factors controlling the observed heave are discussed. The development of frost heave in three subgrade layers (0-0.5, 0.5-1.5, and 1.5-2.7 m depth) was examined at each section over two freezing seasons (October 2015 to September 2017). The frost depth in the subgrade reached 220-400 cm, significantly deeper than in surrounding natural ground. The frost penetrated 2.3 m of A/B group fill, a special fill material for high-speed railways. The frost heave in some sections is greater than the allowable total deformation limit of 19 mm. Most of the total frost heave (40-50%) occurred in the 50 cm thick subgrade surface layer. Residual deformation developed over the two years, which has likely resulted in increased porosity and decreased compaction and strength. Frost heaving is mainly controlled by supplies of water from the surface, from below, and laterally from adjacent ground, and the fines content of the material. The data presented provide valuable information on the construction and performance of high-speed railways in regions with seasonally-frozen ground.