Study on the deformation and failure modes of filling slope in loess filling engineering: a case study at a loess mountain airport

Wang, Jiading; Xu, Youlong; Ma, Y.; Qiao, Shaonan; Feng, Kaiqiang

doi:10.1007/s10346-018-1046-5

Cited by 63 publications

(16 citation statements)

References 31 publications

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“…Loess disintegration aggravates slope erosion, destroying slope forms by cutting and forming gullies, cracks, and caves (Derbyshire, 2001;Zhuang et al, 2017). The Loess plateau has a particular sediment type that formed in the Quaternary period and is characterized by vertical joints, large pore structures, weak cementation, loose texture, and high calcium and soluble salt content (Gu et al, 2015;Wang et al, 2018aWang et al, , 2018bWang et al, , 2019aWang et al, , 2019b. These properties are conducive to loess disintegration in the form of fragmentation, disintegration and caving, after water infiltration.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of loess disintegration characteristics

Wang

Zhang

et al. 2019

Earth Surf Processes Landf

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Loess structures with large joints and fissures often undergo natural disintegration when subjected to contact with water. The slaking of loess results in the formation of loess gullies, caves, and landslides. To study the disintegration properties and the factors influencing them, we carried out field and laboratory tests. First, we carried out an in situ disintegration test using different sample shapes obtained from Heifangtai and analysed the effect of soil sample shape on loess disintegration. We then developed an improved disintegrator and tested the effect of different factors on the disintegration of loess. The effects of water content, salinity, and composition on disintegration are discussed. The results show that the loess disintegration process can be divided into three broad stages – wetting, softening, and subsidence – the disintegration is mainly concentrated in the third stage, while the first two stages are short and show very weak disintegration. The main factors influencing the disintegration of loess samples are shape, size, and clay mineral content. During the in situ disintegration test, the edge angles of soil samples are disintegrated, to soften all their edges. Disintegration duration increases with increasing sample size, but the extent of disintegration was found to decrease. Disintegration duration is inversely proportional to the loess disintegration rate. The loess disintegration rate is positively correlated with water temperature within a certain range; however, the reverse is observed with soil sample size and initial water content, and salinity was found to have little effect on the disintegration rate. Higher clay content of cohesive soil and weaker permeability leads to a slower disintegration rate. Additionally, lower cementation may easily cause loess disintegration. © 2019 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Experimental study of loess disintegration characteristics

Wang

Zhang

et al. 2019

Earth Surf Processes Landf

Self Cite

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“…These fissures destroy the integrity of a slope, resulting in increased rainfall infiltration and a gradual reduction in the strength of the soil (Jin et al, 2012;Wang J. et al, 2018). Also, the fissures lead to stress concentration and large deformation in the slope body, resulting in slope instability (Wang et al, 2017;Wang J. et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Also, the fissures lead to stress concentration and large deformation in the slope body, resulting in slope instability (Wang et al, 2017;Wang J. et al, 2019). Previous studies on rainfall-induced landslides of fissured loess slopes have generally discovered that the failure process of the slopes can be divided into three stages: water infiltration, fissure-deformation development, and sliding (Wang et al, 2017;Zhuang et al, 2018), where the fissure-deformation development stage is of most importance in the formation of loess landslides (Jin et al, 2012;Wang J. et al, 2018;Chen et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Deformation Development Mechanism in a Loess Slope With Seepage Fissures Subjected to Rainfall and Traffic Load

et al. 2021

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Loess landslides induced by rainfall and traffic load are significant hazards during the construction and operation of highways in many loess-covered areas. Studies of the deformation and stability of loess slopes with seepage fissures are limited. In the study, a case study of the Yangpoyao loess slope with seepage fissures in China’s Loess Plateau was conducted to reveal the deformation development mechanism and assess the landslide hazards of such fissured loess slopes. First, the hydraulic-mechanical properties of the Q2 loess were investigated through experiments, and the mathematical expressions of the relationships between various mechanical parameters and water content were fitted, indicating that the mechanical parameters, such as cohesion, angle of internal friction, and deformation modulus, vary in a quasi-linear manner with the water content. Then, a new numerical method was proposed to simulate the mechanical behaviours of the loess considering its water sensitivity and transverse isotropy, where the water sensitivity was considered through the implementation of the mathematical expressions of the hydraulic-mechanical relationships, and the transverse isotropy was considered by the modified constitutive model that combined the logics of transversely elastic model and a ubiquitous-joint model. Finally, the deformation development mechanism of the fissured loess slope under rainfall and traffic load was revealed by using the proposed method. The roles of the rainfall and traffic load in the fissure propagation and deformation development process of the slope were explored, and some stabilisation measures are recommended for the prevention of its failure. The proposed method and findings arising therefrom may provide references for future studies of the stability and landslide hazard assessment of fissured loess slopes.

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“…Many scholars have carried out in-depth research on the creep characteristics of loess and achieved a series of excellent results [21][22][23][24][25][26][27]. In practical engineering, loess is basically multidimensional stress.…”

Section: Introductionmentioning

confidence: 99%

A Test Method for Creep Characteristics of Loess Based on the One‐Dimensional Consolidator

Huang

Wang

et al. 2021

Advances in Civil Engineering

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When the traditional one-dimensional consolidator is used to study the creep characteristics of loess, due to the hoop effect of the ring cutter, only the attenuation creep stage and stable creep stage of loess can be studied, but the accelerated creep stage cannot be presented. In order to avoid the influence of drilling on the creep characteristics of loess, the paper improves the consolidation instrument by drilling holes along the diameter direction in the center of the sample to provide artificial space for soil failure. At the same time, the sample size is increased to ensure that the diameter of the sample is greater than five times of the diameter of the borehole, so as to avoid the influence of drilling on the creep characteristics of loess. The creep characteristics of loess are studied by step loading (vertical pressure at all levels is 125 kPa, 175 Pa, 225 kPa, and 275 kPa), and the whole creep process characteristic curves of loess under different stress conditions are obtained. An endoscope was placed in the hole to observe the deformation and failure characteristics of loess in different stages of creep. This method makes up for the defect that the traditional one-dimensional consolidator cannot obtain the whole process characteristics of loess creep. At the same time, it has the advantages of simple operation, less external influence factors, stronger data reliability, and can directly observe the changes of loess creep soil. It has a beneficial role in promoting the experimental research of loess creep characteristics.

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Study on the deformation and failure modes of filling slope in loess filling engineering: a case study at a loess mountain airport

Cited by 63 publications

References 31 publications

Experimental study of loess disintegration characteristics

Experimental study of loess disintegration characteristics

Deformation Development Mechanism in a Loess Slope With Seepage Fissures Subjected to Rainfall and Traffic Load

A Test Method for Creep Characteristics of Loess Based on the One‐Dimensional Consolidator

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