Influences of soil moisture and salt content on loess shear strength in the Xining Basin, northeastern Qinghai-Tibet Plateau

Fu, Jun; Hu, Xiasong; Li, Xilai; Yu, Dunji; Liu, Yabin; Youqing, Yang; Qi, Zhao-xin; Li, Shuxia

doi:10.1007/s11629-018-5206-9

Cited by 27 publications

(13 citation statements)

References 31 publications

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“…The results showed that the shear strength increased with increasing NaCl concentration, and then decreased with further increase of NaCl concentration; the long-term irrigation can decrease the NaCl concentration and then can lower the soil shear strength in Heitai terrace. Other scholars had also confirmed that the weakening of the shear characteristics of soil is mainly caused by the change of the parameter c' or ϕ' caused by the dissolution loss of soluble salt through laboratory experiments, and they believe that this weakening tends to zero with the increase of leaching times [25,30]. Therefore, the changing trend of the soluble salt content of spring water was analyzed.…”

Section: Discussionmentioning

confidence: 99%

“…At the same time, the water content of the soil will inevitably change during the leaching process of soluble salt in the Loess irrigation area, but this is only limited to the shallow unsaturated area of loess. Although the water content of rock and soil can also affect its shear behavior [6,24,25], we did not quantify the impact of water-content change on the deformation of shallow loess, and this is a deficiency of this work. .…”

Section: Discussionmentioning

confidence: 99%

“…Dijkstra et al [22] found that the shear strength of loess decreased with soluble salt's lixiviation. In a shear test of loess, it was found that the salt content and water content of the soil had a certain influence on its shear strength and other parameters [23][24][25][26]. The salt solution concentration in the pores has also been found to significantly improve soil's shear strength [27,28].…”

Section: Introductionmentioning

confidence: 99%

“…The salt solution concentration in the pores has also been found to significantly improve soil's shear strength [27,28]. In soluble salt leaching experiments, the residual shear strength and its related parameters were observed to decrease with an increase in the leaching times of loess [25,29,30].…”

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: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…The excessive water content exerts an adverse effect on loess shear strength. 15,16 Zhang et al, 17 Lian et al, 18 and Xie et al 19 showed that deformation and strength of unsaturated loess varied significantly with water content variation. Gaaver 20 and Naema 21 found that increasing water content could weaken the connection between soil particles and reduce the soil strength.…”

Section: Introductionmentioning

confidence: 99%

Effect of conglomeration gradation on loess shear strength with different water content

et al. 2021

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Particle gradation and water content are important factors affecting shear strength of soil. However, due to chemical cementation and molecular attraction, loess particles commonly stick together forming conglomerations. Till date, the superposition effect of water content and conglomeration gradation on loess shear strength has rarely been studied and undeniably requires further systematic explorations and development. In this study, loess samples were prepared with three conglomeration gradations and five water contents, and the direct shear tests were systematically performed. The shear strength of sample 1 (continuous conglomeration gradation) was found to be the best, followed by sample 2 (large size conglomerations), and sample 3 (small size conglomerations). The difference of samples’ shear strength decreased with increasing water content, and almost closed to zero when water content was 20%. The cohesion of samples first increased and then decreased with increasing water content, the maximum cohesion occurred at 10% water content. The internal friction angles decreased with increasing water content, and reached similar minimum values when the water content was 15%. The increased percentage values of cohesion and internal friction angle caused by conglomeration gradation are in the range of 33.2%–42.1% and 9.8%–32.5%, respectively. Finally, the empirical formulas for water content-cohesion and water content-internal friction angle of different conglomeration gradations samples were established, and the calculated values are in good agreement with test data. The effect of loess conglomeration gradation on shear strength decreased with increasing water content. When the water content was less than 15%, using a good conglomeration graduation could effectively improve loss shear strength.

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Shear strength and microstructure of silty clay subjected to CaSO4 solution and stability effect on a gypsum dump

Wei

Sun

et al. 2021

Bull Eng Geol Environ

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Influences of soil moisture and salt content on loess shear strength in the Xining Basin, northeastern Qinghai-Tibet Plateau

Cited by 27 publications

References 31 publications

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

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

Effect of conglomeration gradation on loess shear strength with different water content

Shear strength and microstructure of silty clay subjected to CaSO4 solution and stability effect on a gypsum dump

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