Stability analysis of unsaturated clay slope based on the coupled effect of temperature and saturation

In view of the clay slope instability caused by environmental temperature and rainfall infiltration in summer and autumn, the mechanism of the effect of temperature and saturation on unsaturated clay slope stability was discussed. To achieve this objective, this study uses the theoretical and numeri...

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Bibliographic Details
Published in:Quarterly journal of engineering geology and hydrogeology 2022-05, Vol.55 (2)
Main Authors: Liu Zizhen, Liu Zizhen, Wang Xiaogang, Wang Xiaogang, Yin Yue, Yin Yue, Li Jiwei, Li Jiwei, Shao Guotao, Shao Guotao
Format: Article
Language:English
Subjects:
Aggregates
clastic sediments
Clay
Cohesion
Conduction heating
Conductive heat transfer
Coupling
Engineering geology
Geohazards
Heat conduction
heat flow
Infiltration
Landslides
Mathematical models
mechanical properties
moisture
Numerical methods
numerical models
physical properties
Rain
Rainfall
Rainfall infiltration
Safety factors
Saturated soils
Saturation
sediments
Shear strength
Slope stability
Soil mechanics
Soil temperature
soil-water balance
Stability analysis
temperature
Temperature effects
thermal conductivity
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Summary:In view of the clay slope instability caused by environmental temperature and rainfall infiltration in summer and autumn, the mechanism of the effect of temperature and saturation on unsaturated clay slope stability was discussed. To achieve this objective, this study uses the theoretical and numerical methods. Based on the theory of unsaturated clay and the law of heat conduction, the relationship between cohesion and matrix suction of unsaturated clay was derived considering the influences of temperature and saturation. Considering the effect of temperature and saturation, the coupling equation of shear strength of unsaturated clay was constructed under conditions of rainfall infiltration. The coupling equation of temperature and saturation was used in the strength reduction method, and the slope stability was analysed by FLAC software. The results show that the cohesion of unsaturated clay slope increases with the increase of depth, and the safety factor considering the coupled effect of temperature and saturation is smaller than that without considering the temperature effect; the clay slope is unstable considering the coupled effect of temperature and saturation, but stable without considering the coupled effect when the saturation of soil reaching 80%. Thematic collection: This article is part of the Role of water in destabilizing slopes collection available at: https://www.lyellcollection.org/cc/Role-of-water-in-destabilizing-sl opes
ISSN:1470-9236
2041-4803
DOI:10.1144/qjegh2021-009