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

WANG Xuedong; LI Shiyu; SUN Yanfeng; YE Guo

doi:10.3969/j.issn.1001-1986.2019.05.019

Volume 47 Issue 5

Oct. 2019

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COAL GEOLOGY & EXPLORATION > 2019 > 47(5): 138-143. > DOI: 10.3969/j.issn.1001-1986.2019.05.019

WANG Xuedong, LI Shiyu, SUN Yanfeng, YE Guo. Influence of the freezing-thawing cycles on soil-water characteristics of soil in open-pit mine dumping sites[J]. COAL GEOLOGY & EXPLORATION, 2019, 47(5): 138-143. DOI: 10.3969/j.issn.1001-1986.2019.05.019

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

College of Mining, Liaoning Technical University, Fuxin 123000, China

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National Natural Science Foundation of China(51604140)

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Received Date: November 13, 2018
Published Date: October 24, 2019

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

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

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