Influence of the freezing-thawing cycles on soil-water characteristics of soil in open-pit mine dumping sites

Authors

WANG Xuedong, College of Mining, Liaoning Technical University, Fuxin 123000, China
LI Shiyu, College of Mining, Liaoning Technical University, Fuxin 123000, China
SUN Yanfeng, College of Mining, Liaoning Technical University, Fuxin 123000, China
YE Guo, College of Mining, Liaoning Technical University, Fuxin 123000, China

Abstract

In order to study the unsaturated soil-water characteristics of soil under freezing-thawing cycles, the soil in Yuanbaoshan open-pit mine dumping site was selected as the research object. The variation of matrix suction and structure of soil under different water content after different freezing-thawing cycles was studied. The results show that during the same freezing-thawing cycles, the matrix suction increases with the decrease of water content, and the range increases gradually. The soil-water characteristic curve can be divided into sensitive stage, sub-sensitive stage and insensitive stage. With the increase of freezing-thawing cycles, the curvature of soil-water characteristic curve increases first and then tends to be stable, and the sensitivity of matrix suction to the increase of freezing-thawing cycles decreases gradually. Freezing-thawing cycles destroy the uniformity of soil particles, and the influence of initial freezing-thawing cycles is the most significant. Van-Genuchten model can better predict the soil-water characteristic curve of soil. Therefore, the influence of freezing-thawing cycles on the stability of dump slope should be emphasized in the process of mine dumping.

Keywords

dumping site, unsaturated soil material, freezing-thawing cycles, soil-water characteristic curve, slope stability

DOI

10.3969/j.issn.1001-1986.2019.05.019

Recommended Citation

WANG Xuedong, LI Shiyu, SUN Yanfeng, et al. (2019) "Influence of the freezing-thawing cycles on soil-water characteristics of soil in open-pit mine dumping sites," Coal Geology & Exploration: Vol. 47: Iss. 5, Article 20.
DOI: 10.3969/j.issn.1001-1986.2019.05.019
Available at: https://cge.researchcommons.org/journal/vol47/iss5/20

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