中文核心期刊
CSCD来源期刊
中国科技核心期刊
RCCSE中国核心学术期刊

重庆交通大学学报(自然科学版) ›› 2019, Vol. 38 ›› Issue (12): 76-80.DOI: 10.3969/j.issn.1674-0696.2019.12.11

• 道路与铁道工程 • 上一篇    下一篇

冻融循环条件下石灰改良土路基回弹模量研究

宋金华,林园皓   

  1. (河北工业大学 土木与交通学院,天津 300401)
  • 收稿日期:2018-08-07 修回日期:2018-12-19 出版日期:2019-12-21 发布日期:2019-12-24
  • 作者简介:宋金华(1961—),男,河北衡水人,教授,主要从事道路工程方面的研究。E-mail:sjhua168@126.com。 通信作者:林园皓(1995—),男,四川南充人,硕士研究生,主要从事道路工程方面的研究。E-mail:674656807@qq.com。

Resilient Modulus of Lime Modified Subgrade Soil under Freezing-Thawing Cycle

SONG Jinhua, LIN Yuanhao   

  1. (School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, P. R. China)
  • Received:2018-08-07 Revised:2018-12-19 Online:2019-12-21 Published:2019-12-24

摘要: 经历多次冻融循环的路基土,其力学性能下降非常迅速,导致路基的路用性能也不断衰减。根据室内冻融循环实验,采用动三轴重复加载的实验方法,对石灰改良后的路基土进行了一系列动回弹模量实验,研究了冻融次数、含水率、掺灰比以及压实度等对石灰改良土路基动回弹模量的影响规律。研究结果表明:随着冻融循环次数增加,石灰改良路基土动回弹模量不断减小,冻融循环对其动回弹模量的影响较显著;当应力状况相同时,石灰改良路基土的平衡含水率越高,其动回弹模量对冻融循环的敏感程度越高,且动回弹模量值趋于不稳定。

关键词: 道路工程, 石灰改良路基土, 动回弹模量, 冻融循环

Abstract: After experiencing many repeated freeze-thaw cycles, the mechanical properties of the subgrade soil decrease rapidly, resulting in a continuous decline of the road performance of the subgrade. Based on the indoor freezing-thawing cycle experiment, a series of dynamic resilient modulus experiments were carried out on the lime-modified marine sedimentary soil by using the dynamic tri-axial repeated loading method. The influence rule of the freezing-thawing times, water content, ash mixing ratio and compaction degree on the dynamic resilience modulus of lime-modified soil subgrade were studied. The results show that with the increase of the number of freezing-thawing cycles, the dynamic resilience modulus of lime-modified subgrade decreases continuously, and the influence of freezing-thawing cycles on its dynamic resilience modulus is significant. When the stress condition is the same, the higher the equilibrium moisture content of lime-modified subgrade soil is, the more sensitive the dynamic resilient modulus is to the freezing-thawing cycle, and the dynamic resilient modulus tends to be unstable.

Key words: road engineering, lime modified subgrade soil, dynamic resilience modulus, freezing and thawing cycle

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