Study on the mechanism of loess landslide induced by chlorine salt in Heifangtai terran

Wang, Juan; Liu, Wei; Chen, Wenwu; Liu, Peng; Jia, Bobo; Xu, He; Wen, Li

doi:10.3208/jgssp.v07.024

Cited by 7 publications

(5 citation statements)

References 31 publications

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“…Rainfall, irrigation, earthquakes, and human activities are considered the main factors triggering loess landslides [13][14][15][16][17][18]. For example, in August 1955, a loess landslide with a volume of 3 × 107 m 3 occurred in Wolongsi of Baoji, Shaanxi Province, destroying a railroad, and a landslide occurred again at this location in 1971, killing 28 people [19].…”

Section: Introductionmentioning

confidence: 99%

Mechanistic Investigation of Typical Loess Landslide Disasters in Ili Basin, Xinjiang, China

et al. 2021

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In the period from 2010 to 2018, a total of 302 geological disasters occurred in the Xinjiang Autonomous Region, China, of which 136 occurred in the Ili Basin. Compared with those in other regions, the loess landslides in the Ili Basin are strongly influenced by the seasonal freeze–thaw effect. Taking the No. 2 Piliqinghe landslide as an example and based on the field geological investigation, it was found in the present study that the main triggering factors of this landslide were the snowmelt erosion of the slope toe and meltwater infiltration into the trailing edge of the slope. The mechanism of loess landslide instability was studied using numerical simulation. The results showed that (1) the Piliqinghe landslide disaster was formed through a process composed of the local sliding of the leading edge → the creep sliding and tension cracking of the slope surface → the overall sliding stage; (2) the infiltration of snowmelt was the direct cause of the landslide formation; (3) the fluvial erosion and softening caused the soil of the slope toe to slide. The results can be used as a reference for the analysis of the disaster mechanism and movement characteristics of similar loess landslides.

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Section: Introductionmentioning

confidence: 99%

Mechanistic Investigation of Typical Loess Landslide Disasters in Ili Basin, Xinjiang, China

et al. 2021

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“…In one hand, it increases the weight of the slope and on the other hand makes the soil more resistant. The shear strength is reduced (Yang et al 2010). By fitting the changes of soil strength parameters under different normal stresses, the shear strength envelope of natural soil and artificially intervention saturated landslide soil was obtained (Fig.…”

Section: Resultsmentioning

confidence: 99%

Hydrological and mechanical properties of loess landslides under different vegetation restoration types

Shi

Liu

Yang³

2021

Bangladesh J. Bot.

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Loess landslide is a common geological disaster in northern Shaanxi, which seriously affects people's life and property safety and social and economic development. The research on vegetation restoration types and hydrological and mechanical properties of loess landslides can provide basic data support for landslide stability prediction, and further provide reference for landslide prevention and treatment. In the present study, the loess landslide point of Zhang Zi Gou in Gan Quan County, Yan’an City was taken as the research object. On the basis of the existing natural condition data, the basic physical and mechanical properties and hydrological characteristics were obtained by collecting field landslide soil samples for indoor experimental analysis. The indoor analysis shows that the landslide is mainly distributed in dry land, medium coverage and low coverage grassland, indicating that the surface vegetation coverage can affect the stability of landslide. The worse the vegetation coverage, the more landslides occur. The void ratio and porosity of landslide soil decrease with the increase of dry density. The cohesion of natural soil is obviously higher than that of saturated soil, and the internal friction angle of natural soil is slightly lower than that of saturated soil. In general, due to the influence of water content, the shear strength of natural soil samples is higher than that of saturated soil samples. Therefore, in order to improve the accuracy of prediction and early warning system, it is necessary to consider the response of hydrological and mechanical properties of loess to vegetation restoration. The results provide basic data support for the establishment of loess landslide stability prediction system and provide reference for geological disaster management. Bangladesh J. Bot. 50(3): 795-801, 2021 (September) Special

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“…It has been shown that the NaCl concentration can have a fundamental influence on the shear behavior of loess soils [19,22,25]. Fan et al, [17] has reported that the shear strength of saturated loess soils increases as the NaCl concentration increases, while some other researchers have concluded that the increase of NaCl concentration leads to the reduction in shear strength of saturated loess soils [22,45]. However, we found that both the peak strength and residual strength increase as the NaCl concentration increases up to a specific value (See Figures 6 and 7).…”

Section: The Peak Shear Strength and Residual Strengthmentioning

confidence: 99%

Effect of Soaking Time and Salt Concentration on Mechanical Characteristics of Slip Zone Soil of Loess Landslides

Xue¹,

Wang²,

Li³

2020

Water

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Loess landslides are closely related to the variation in mechanical properties of soils due to the leaching of irrigation water in the irrigation area which causes the loss of soluble salt in the loess stratum. To investigate the effect of leaching on the mechanical characteristics of loess, ring shear tests were conducted on the slip zone soil samples obtained from a typical loess landslide under different soaking time and salt concentration. Furthermore, the microstructural observations were made on shear planes by using SEM (scanning electron microscopy) tests. The experiment revealed that: firstly, the shear strength of loess decreases with the increase of soaking time before reaching the minimum value at the soaking time of 1 d, and then increases with the soaking time until reaching a relatively stable value. Secondly, the shear strength of loess has an increasing tendency with the salt concentration before reaching a maximum value at the salt concentration of 8%, and then shear strength decreases. In addition, a “stress-softening” was found for the loess samples with the soaking time of 1 d and salt concentration of 8%. It is found that the total number of micropores and small-pores in loess samples decreases with increasing salt concentration up to 8%, but increases rapidly between salt contents of 8% and 20%. The SEM tests showed that the increase in salt concentration (0% to 8%) facilities the formation of small aggregates within loess soils, which in turn promotes the increasing of shear strength. However, further increase in salt concentration (8% to 20%) helps the development of relatively large aggregates in loess samples, resulting in the reduction in shear strength.

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Study on the mechanism of loess landslide induced by chlorine salt in Heifangtai terran

Cited by 7 publications

References 31 publications

Mechanistic Investigation of Typical Loess Landslide Disasters in Ili Basin, Xinjiang, China

Mechanistic Investigation of Typical Loess Landslide Disasters in Ili Basin, Xinjiang, China

Hydrological and mechanical properties of loess landslides under different vegetation restoration types

Effect of Soaking Time and Salt Concentration on Mechanical Characteristics of Slip Zone Soil of Loess Landslides

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