Changes in stability conditions of clay slopes due to leaching: a case study

Toulegilan, Mahdi Madadzadeh; Chenari, Reza Jamshidi; Neshaei, Mir Ahmad Lashteh; Forghani, Akbar

doi:10.1007/s42452-020-2831-z

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…There are also relevant reports that the continuous loss of salt ions caused by long-term seepage leaching further aggravates soil structure degradation and strength. This eventually leads to the large deformation of the loess surface, which may cause slope instability [18,29,57,58]. The results of the present study, as well as the laboratory test results of other investigations, demonstrate that the mechanical behavior of rock and soil is affected by the chemical composition of the pore fluid to a certain extent.…”

Section: Discussionmentioning

confidence: 52%

“…On the contrary, the infiltration of irrigation water has a serious effect on the dissolution and lixiviation of soluble salt in rock and soil. This changes the shear strength and other parameters of loess, which then affect the stability of the landslide mass [18,53,54]. In addition, these changes may cause the formation of collapsible pits and cracks, which can become dominant channels for the rapid infiltration of water.…”

Section: Discussionmentioning

confidence: 99%

“…Loess is a type of cemented soil [12,13]; when the cement (especially non-stable aqueous aggregates) comes into contact with water, the cementation strength among the particles is weakened by chemical or physical changes [14,15]. This destroys the microstructure of the soil [16] and changes the structural strength of the soil, thus affecting slope stability [17,18]. According to the Coulomb-Mohr law, the shear strength of a soil is related to the cohesion (c'), the effective normal stress on the failure plane (σ'n), and the angle of shearing resistance (ϕ').…”

Section: Introductionmentioning

confidence: 99%

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Effect of Soluble Salt Loss via Spring Water on Irrigation-Induced Landslide Deformation

Zong-lin

Zeng

Meng

et al. 2020

Water

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Landslide exposes the previously blocked groundwater discharge. High concentrations of soluble salt form salt sinters that can be observed near discharge passages. Based on existing laboratory investigation results of soil leaching and shearing reported in the literature, the effect of the soluble salt loss via spring water on irrigation-induced landslide deformation was studied under large-scale conditions. During our field investigation of landslides in the Heitai terrace of the Yellow River’s upper reaches in Gansu Province, China, 35 spring outlets were found, and the Heitai terrace was divided into five subareas, based on the difference in spring flow. Deformation data for the terrace were obtained by small baseline subset technology (SBAS-InSAR). These data were analyzed in combination with the amount of soluble salt loss, to explore the correlation between the deformation of the landslide and the soluble salt loss in the loess irrigation area. The results showed that the cumulative deformation and the loss of soluble salt were increasing continuously in the terrace. Although the increasing intensity of each subarea was different, the changing intensity of the two during the corresponding monitoring period was highly consistent. The statistical analysis revealed a strong positive correlation between the accumulated loss of soluble salt via spring water and the accumulated displacement of the terrace edge (p < 0.01). After the slope k between the two was tested by the Grubbs test and t-test, the k was no abnormality (α = 0.05) and difference (Sig > 0.05), further providing the basis for confirming the existence of this positive correlation. When the loss of soluble salt in rock and soil increased gradually, the accumulated deformation of the terrace edge also increased continuously. The findings of this study are of great significance for understanding the formation mechanism of landslides and the identifying landslide revival in irrigation areas of the Loess Plateau.

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Section: Discussionmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 99%