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Published in: Bulletin of Engineering Geology and the Environment 7/2023

01-07-2023 | Original Paper

Slope stability under the influence of irrigation and frozen stagnant water effect in Heifangtai

Authors: Guang Li, Ming-gao Tang, Ming-li Zhang, Da-lei Peng, Huan-le Zhao, Jian Zhou

Published in: Bulletin of Engineering Geology and the Environment | Issue 7/2023

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Abstract

The Heifangtai, known as the modern natural landslide laboratory, is an independent loess tableland formed, which is located in northwest China. Agricultural irrigation in Heifangtai leads to a substantial rise in groundwater table. The loess landslides induced by irrigation and frozen stagnant water effect are a common geologic hazard in this area. However, in the existing researches, less attention was paid to the influencing factors of the frozen stagnant water effect, and the groundwater table lacked long-term data monitoring. In the numerical simulation, the seasonal variation of irrigation and the preferential channels of loess caves are not considered simultaneously. The response relationships among irrigation, frozen stagnant water effect, groundwater table, and slope stability are not yet clear. Based on field monitoring and numerical simulation, this paper studied the variation law of groundwater table under the irrigation and frozen stagnant water effect. The influence laws between irrigation, frozen stagnant water effect, and slope stability are discussed. Field monitoring found that the soil in the slope unsaturated area has longer freezing time and thicker freezing depth. Under the combination of irrigation and frozen stagnant water effect, the groundwater table kept rising from May 2019 to February 2020. Irrigation led to the increase of groundwater level by 0.35–0.45 m in 1 year. During the freezing period, the minimum slope safety stability coefficient caused by frozen stagnant water effect is 1.64. During the thawing period, the minimum slope safety stability coefficient caused by irrigation is 1.7. The slope failure is most prone to occur in February.

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Metadata
Title
Slope stability under the influence of irrigation and frozen stagnant water effect in Heifangtai
Authors
Guang Li
Ming-gao Tang
Ming-li Zhang
Da-lei Peng
Huan-le Zhao
Jian Zhou
Publication date
01-07-2023
Publisher
Springer Berlin Heidelberg
Published in
Bulletin of Engineering Geology and the Environment / Issue 7/2023
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-023-03264-7

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