降雨入渗下铁路路基含水率分布及影响分析

Translated title of the contribution: Variation in water content and influences on rail track embankment subject to rainfall infiltration

Yuanjie Xiao, Liuxin Chen, Xiaoyong Lu, Meng Wang, Wenqi Li, Xiaobin Chen, Xinyu Ye

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

Research purposes: In order to better understand internal mechanism of railway subgrade disease induced by rainfall infiltration, the finite element model of typical HSR track substructure was developed based on the unsaturated flow theory and consideration of moisture-sensitive characteristics of resilient modulus and accumulated plastic strain behavior. The influencing depth of infiltration, the saturated zone, water content, resilient modulus, and accumulated plastic strain, and their temporal-spatial variations with different rainfall intensity levels were analyzed. Research conclusions:(1) The rainfall infiltration mainly affects the top embankment with rainwater hardly migrating into the bottom embankment or deeper depth. (2) Rainfall infiltration leads to the decrease of average vertical resilient modulus for top embankment but insignificant change for bottom embankment. (3) When the daily rainfall intensity increases to 25 mm, the saturated areas within the top embankment become considerable and inter-connected with water pockets formed at the interface of embankment layers, which may cause local collapse, differential settlement, or shear failure along the interface. (4) The priority areas of subsurface drainage design and maintenance are surface cracks of top embankment and bottom surface of lower embankment. (5) The research findings could provide references for the design and maintenance decision of railway subgrade waterproof and drainage.

Translated title of the contributionVariation in water content and influences on rail track embankment subject to rainfall infiltration
Original languageMandarin
Pages (from-to)7-12
Number of pages6
JournalJournal of Railway Engineering Society
Volume37
Issue number7
Publication statusPublished - Jul 2020

Keywords

  • Accumulative plastic strain
  • Rainfall infiltration
  • Resilient modulus
  • Track embankment

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