苑晓青, 陈冠甫, 师智勇, 等.冻融循环对季冻土分散性影响及明矾改性试验研究[J].河南理工大学学报（自然科学版）,2021,40(5):146-152.

YUAN X Q, CHEN G F, SHI Z Y, et al.Effect of freeze-thaw cycles on dispersion of seasonal frozen soil and experimental study on alum modification[J].Journal of Henan Polytechnic University(Natural Science) ,2021,40(5):146-152.

冻融循环对季冻土分散性影响及明矾改性试验研究

苑晓青, 陈冠甫, 师智勇, 张禹琦, 赵宏生, 郝艳凯, 钟文晴

吉林大学 建设工程学院，吉林 长春130026

摘要:为测定季冻土的基本物化性质、矿物成分含量，进行分散性随着冻融次数的增加而发生变化的试验，并探究不同明矾用量对季冻土分散性的改性作用，确定对季冻土分散性具有明确改善的用量，探索明矾改性土的分散性随冻融循环次数增加而发生的变化。试验结果表明：本次研究区的季冻土样属于粉质黏土，Na+含量相对较高，并且具有较强的分散性；季冻土样的分散性随着冻融循环次数的增加而增加，并且在冻融循环次数达到7次后，季冻土土样的分散性达到了非常高的水平；含2.5％明矾的改性土样分散性指标也随着冻融循环次数的增加而增加，但在试验设定的20次冻融循环下，依然属于非分散性土。研究成果可为季冻土质路堤稳定性分析及工程改善提供参考。

关键词:季冻土;道路工程;冻融循环;分散性;明矾

doi:10.16186/j.cnki.1673-9787.2020020017

基金项目:国家自然科学基金资助项目（41602285 ）；吉林省科学发展计划项目（20180520064JH）

收稿日期:2020/02/11

修回日期:2020/09/02

出版日期:2021/09/15

Effect of freeze-thaw cycles on dispersion of seasonal frozen soil and experimental study on alum modification

YUAN Xiaoqing, CHEN Guanfu, SHI Zhiyong, ZHANG Yuqi, ZHAO Hongsheng, HAO Yankai, ZHONG Wenqing

JUin University Construction Engineering， Changchun 130026 ， Jilin， China

Abstract:In order to determine the basic physical and chemical properties and mineral content of the frozen soil ， the experiment was carried out to determine the change of dispersion with the increase of freezing and thawing times ，to explore the modification effect of different dosage of alum on the dispersion of seasonal frozen soil so as to determine the dosage that had a clear improvement on the dispersion of seasonal frozen soil， and to explore the change of the dispersion of alum modified soil with the increase of the number of freeze-thaw cycles. The results showed that the seasonal permafrost samples in this study area belonged to silty clay with relatively high content of sodium ions and strong dispersion. The dispersion of seasonal frozen soil samples in-creased with the increase of the number of freeze-thaw cycles， and when the number of freeze-thaw cycles reached 7， the dispersion of seasonal frozen soil samples reached a very high level. The dispersion index of the modified soil containing 2.5% alum also increased with the increase of the number of freeze-thaw cycles ， but it still belonged to the non-dispersed soil under the 20 freeze-thaw cycles set by the test. The research results could provide reference for stability analysis and engineering improvement of seasonal frozen soil embankment.

Key words:seasonal frozen soil;road engineering;freeze-thaw cycle;dispersion;alum

 冻融循环对季冻土分散性影响及明矾改性试验研究_苑晓青.pdf