Microstructural constraints on geotechnical properties of Malan Loess: A case study from Zhaojiaan landslide in Shaanxi province, China

Luo, Hui; Wu, Fa-Quan; Chang, Jinyuan; Xu, Jinyu

doi:10.1016/j.enggeo.2017.11.002

Cited by 93 publications

(28 citation statements)

References 16 publications

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“…Loess failure can change the microstructure of the soil, further influencing its macroscopic geotechnical properties. Therefore, the interparticle cementation and shear strength of disturbed soil are lower than those of undisturbed soil [37,50]. In fact, these variations have a remarkable impact on infiltration.…”

Section: The Temporal Evolution Of the Infiltration Rate In A Recent mentioning

confidence: 97%

Spatial and Temporal Evolution of the Infiltration Characteristics of a Loess Landslide

Yang

Qiu

Pei

et al. 2020

IJGI

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Infiltration plays an important role in influencing slope stability. However, the influences of slope failure on infiltration and the evolution of infiltration over time and space remain unclear. We studied and compared the infiltration rates in undisturbed loess and disturbed loess in different years and at different sites on loess landslide bodies. The results showed that the average initial infiltration rate in a new landslide body (triggered on 11 October 2017) were dramatically higher than those in a previous landslide body (triggered on 17 September 2011) and that the infiltration rates of both landslide types were higher than the rate of undisturbed loess. The initial infiltration rate in the new landslide body sharply decreased over the 4–5 months following the landslide because of the appearance of physical crusts. Our observations indicated that the infiltration rate of the disturbed soil in a landslide evolved over time and that the infiltration rate gradually approached that of undisturbed loess. Furthermore, in the undisturbed loess, both the initial and quasi-steady infiltration rates were slightly higher in the loess than in the paleosol, and in the previous landslide body, the infiltration rate was highest in the upper part, intermediate in the middle part, and lowest in the lower part. This study can help us to better understand the evolution process of infiltration in undisturbed loess, previous landslides, and new landslides.

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Section: The Temporal Evolution Of the Infiltration Rate In A Recent mentioning

confidence: 97%

Spatial and Temporal Evolution of the Infiltration Characteristics of a Loess Landslide

Yang

Qiu

Pei

et al. 2020

IJGI

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“…When cementation bonds fail (in shear or as a consequence of wetting up)this open fabric collapses resulting in potentially rapid packing transformations and an equally rapid loss of shear strength. The degree of collapsibility of the fabric strongly depends on depositional environment and stress history (age); this has resulted in intensive research efforts focusing on linking micro-structure to the mechanical behavior of loess (Derbyshire and Mellors, 1988;Fredlund and Rahardjo, 1993;Hu et al, 2001;Zhang et al, 2013b;Jiang et al, 2014;Xu et al, 2017Liang et al 2018;Luo et al, 2018;Zhang and Wang, 2018). Recent developments are making good use of enhanced resolution of computed tomographyscanning and advanced image processing techniques to investigate 3D changes in loess microstructure (Zhao et al 2017).…”

Section: Characteristics Of Loess In Chinamentioning

confidence: 99%

“…Loess is very sensitive to water and loses strength rapidly uponwetting. There is extensive evidence that precipitation and irrigation lead to slope failure Xu et al, 2012b;Leng et al, 2018;Qi et al, 2018;Luo et al, 2018). Research has shown that loess shear strength is dependent upon variations in moisture content with a complete loss of cemented strength and a reduction in frictional resistance as the material wets up (e.g.…”

Section: Triggering and Kinematic Behaviormentioning

confidence: 99%

Loess geohazards research in China: Advances and challenges for mega engineering projects

Juang

Dijkstra

Wąsowski

et al. 2019

Engineering Geology

186

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Loess is a meta-stable, cemented assemblage of mainly silt and clay-sized particles of low plasticity.When dry it behaves like a brittle material, but when wetted up the fabric rapidly collapses. Unique geomorphological features include extensive surface erosion, soil piping (loess 'karst'), catastrophic landslides, and widespread collapse (hydro-consolidation). The Chinese Loess Plateau is a more or less continuous drape of thick loess covering some 440,000 km 2 . It isone of China's regions that is most prone to geohazards. This paper reviews advances in the research related to loess geohazards, drawing particular attention tothe need to apply research findings to recent, very large (mega-)construction projects in loess terrain such as the Mountain Excavation and City 2 Construction in Yan'anlevelling 78 km 2 for urban expansion, the Lanzhou New District creating 246 km 2 , and large engineered interventions in the landscape for gully control and land reclamation such as those in Shaanxi and Gansu generating agricultural land covering an area of some 8,000 km 2 . These projects are in response to increasing pressures to facilitate expansion of urban centres, their interconnecting infrastructures and their agricultural support systems. It is argued that,where proper application of scientific knowledge for engineering control (e.g. density, drainage)of these new landscapes is absent, these project generate a substantial, and costly geohazard legacy for future generations.

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“…The structure of the soil is analyzed during progressive creep, including observations on number, area, size, orientation, and shape of particles and pores. Luo et al (2018) report research achievements on the microstructure and macroscopic geotechnical properties of Malan loess. The triaxial and uniaxial compression tests are performed under humidifying conditions on undisturbed loess and micro-structural changes were observed using scanning electron microscopy.…”

Section: Loess Engineering Propertiesmentioning

confidence: 99%

Preface to the special issue on “Loess engineering properties and loess geohazards”

Peng

Williams³

et al. 2018

Engineering Geology

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Microstructural constraints on geotechnical properties of Malan Loess: A case study from Zhaojiaan landslide in Shaanxi province, China

Cited by 93 publications

References 16 publications

Spatial and Temporal Evolution of the Infiltration Characteristics of a Loess Landslide

Spatial and Temporal Evolution of the Infiltration Characteristics of a Loess Landslide

Loess geohazards research in China: Advances and challenges for mega engineering projects

Preface to the special issue on “Loess engineering properties and loess geohazards”

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