Salt expansion characteristics and analysis model of coarse-grained sulfate saline soil embankment fill material with increasing fines content

WANG Xu-chao; ZHANG Sha-sha; ZHAO Kai-xuan

doi:10.16285/j.rsm.2021.1810

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Salt expansion characteristics and analysis model of coarse-grained sulfate saline soil embankment fill material with increasing fines content

更新时间：2026-06-25

- Salt expansion characteristics and analysis model of coarse-grained sulfate saline soil embankment fill material with increasing fines content
- Vol. 43, Issue 8, Pages: 2191-2202(2022)
- 作者机构：
  
  1. 长安大学公路学院,陕西,西安,710064
  2. 同济大学土木工程学院,上海,200092
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2021.1810
  CLC： U416.16
- Online First：17 August 2022，
  
  Published：2022
- 稿件说明：
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WANG Xu-chao, ZHANG Sha-sha, ZHAO Kai-xuan. Salt expansion characteristics and analysis model of coarse-grained sulfate saline soil embankment fill material with increasing fines content[J]. 2022, 43(8): 2191-2202.
DOI：

WANG Xu-chao, ZHANG Sha-sha, ZHAO Kai-xuan. Salt expansion characteristics and analysis model of coarse-grained sulfate saline soil embankment fill material with increasing fines content[J]. 2022, 43(8): 2191-2202. DOI： 10.16285/j.rsm.2021.1810.

摘要

为了明确细粒土含量对粗粒硫酸盐渍土路基填料盐胀量的影响，针对 1% 和 3%含盐量工况下的砂、砾类盐渍土，采用降温试验研究了细粒土含量递增条件下粗粒硫酸盐渍土的盐胀特点。在此基础上，利用 PFC技术模拟了粗粒盐渍土的盐胀变形并分析其机制，结合微观试验分析了盐胀状态中粗粒土骨架典型状态。结果表明：随着细粒土含量的增加，粗粒硫酸盐渍土的盐（冻）胀量均先增加后减少再增大，分界细粒土含量因含盐量及土类不同而异，1%、3% 含盐量的砂、砾类土样分别在15%和10%细粒土含量时产生最大盐（冻）胀量；3%含盐量砂、砾类土的起始盐胀温度约 20℃，1%含盐量土样的起始盐胀温度随细粒土含量及土种类不同差异较大且存在明显的界限细粒土含量，当细粒土含量低于界限值时土体的起始盐胀温度约为0.5～2℃，高于界限值时土体的起始盐胀温度约为 4～12℃；同时提出了盐胀状态中粗粒土骨架典型状态模型及其作为路基填料的细粒土含量界限值。

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