doi:10.16186/j.cnki.1673-9787.2020020017

Received:2020/02/11

Revised:2020/09/02

Published: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