Characteristic analysis of large-scale loess landslides: a case study in Baoji City of Loess Plateau of Northwest China

Wang, H. B.; Zhou, Bo; Wu, Shuren; Shi, Jiansheng; Li, B.

doi:10.5194/nhess-11-1829-2011

Cited by 50 publications

(8 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Landslides, the most frequent geohazard in China, have attracted considerable research attention (Wang et al, 2011;Zhou and Zhao, 2013;Deng et al, 2021). Most of this research, however, has focused on large-scale landslides, involving rapid movement and large-scale destruction.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Failure Models and Deformation Evolution Process of Geological Hazards in Ganzhou City, China

Zhan

Wang

et al. 2021

Front. Earth Sci.

View full text Add to dashboard Cite

In Ganzhou City, China, a complex bedrock lithology and structure, diverse topography, frequent engineering works, and abundant rainfall generate frequent, sudden, small-scale landslides that are difficult to prevent and control. This study integrates evidence data from a field investigation of landslides with geological-engineering analogues to document the distribution and development of these geohazards in Ganzhou City. Based on the distribution of landslides across different types of bedrock and soil, we identify five lithological groups prone to slope failure: granite, metamorphics (slate and phyllite), red sedimentary layers, clastic sedimentary rocks with weak interlayers, and loose Quaternary deposits. Granite and metamorphic bedrock are the two lithologies most prone to landslides. Our analysis of the genesis and mode of slope failure suggests that most landslides in Ganzhou City originated from four modes of slope failure: scouring erosion collapse, steep slope collapse, rock sliding along a rock stratum, and wedge-shaped block sliding and caving. An in-situ model test and numerical simulations were used to explore the evolution of slope deformation and failure on the most landslide-prone lithological groups, and the accumulation of debris post-failure. This work provides a reference for the assessment of the risk from, and the management of, landslide geohazards in Ganzhou City and geologically similar regions.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis of Failure Models and Deformation Evolution Process of Geological Hazards in Ganzhou City, China

Zhan

Wang

et al. 2021

Front. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…The Saleshan landslide is markedly different from widespread loessmudstone slides in the Chinese Loess Plateau, which exhibit almost identical geological structure features. Loess-mudstone slides only have a short travel distance and slow movement velocity (Wang et al, 2004;Wang et al, 2011), and these landslides are commonly triggered by large old earthquakes (Liu et al, 2018;Xu et al, 2020).…”

Section: Shear Propertiesmentioning

confidence: 99%

A catastrophic flowslide that overrides a liquefied substrate: the 1983 Saleshan landslide in China

Zhang

Peng

Gao

et al. 2021

Earth Surf Processes Landf

View full text Add to dashboard Cite

Flowslides that override a liquefied substrate can vastly enhance a disaster after failure initiation. These effects may result from the rapid velocity and long runout distance from slides mobilized into flows. It is thus crucial to provide an improved understanding of the transformation mechanisms of catastrophic flowslides for hazard evaluation. This study examines the Saleshan landslide in Gansu, China, which occurred in 1983 and killed more than 200 people. The Saleshan landslide travelled for approximately 1 km due to pore water pressure generation resulting from overrunning and liquefication of the alluvial sands in the river valley below. We used geomorphologic and topographic maps to determine its dynamic features and mobilization behaviors on the landslide body, and placemarks and seismic signals to identify its approximate velocity at different sites. Electrical resistivity tomography (ERT) surveys also revealed the hydrogeological conditions post-landslide, showing a clear groundwater table along with the liquefied alluvial sand and gravel layers. Particle size distributions and triaxial shear behaviors confirmed more ready liquefaction of superficial loess and underlying alluvial sand in comparison with the red soil above and below them. Novel loading impact triaxial testing was also performed on the alluvial sand to elucidate its liquefaction potential in undrained and drained conditions.The alluvial sand was found to be markedly prone to liquefaction in undrained conditions due to impact-induced increased pore water pressure. The results further demonstrated that the Saleshan landslide underwent a transformation from a slowing slide on a steep slope, where it originated, to flow on a nearly flat terrace with abundant groundwater that it overrode. The transformation mechanism involved the liquefied alluvium sand substrate, which greatly enhanced the landslide mobility. Along with recent, similar findings from landslides globally, substrate liquefaction may result in a widespread, significant increase in landslide mobility and thus hazard, and the present study identifies the requisite conditions for this phenomenon to occur.

show abstract

“…The loess landscape is very dynamic and heavily influenced by tectonics leading to the development of joint systems that, in turn, influence loess slope morphologies and the position and timingof loess geohazards. Extensive field surveys of loess slopes coupled with a statistical analysis of joints and fissures and the mapping of weak interfaces (such as paleosols) enabled the establishment of a relationship between the internal loess slope structure and landslide occurrence (Derbyshire et al, 2000;Wang, et al, 2011;Peng et al, 2016aPeng et al, , 2016bPeng et al, , & 2017bPeng et al, , 2017dZhuang et al, 2018).…”

Section: Characteristics Of Loess In Chinamentioning

confidence: 99%

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

Juang

Dijkstra

Wąsowski

et al. 2019

Engineering Geology

184

View full text Add to dashboard Cite

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.

show abstract

Characteristic analysis of large-scale loess landslides: a case study in Baoji City of Loess Plateau of Northwest China

Cited by 50 publications

References 16 publications

Analysis of Failure Models and Deformation Evolution Process of Geological Hazards in Ganzhou City, China

Analysis of Failure Models and Deformation Evolution Process of Geological Hazards in Ganzhou City, China

A catastrophic flowslide that overrides a liquefied substrate: the 1983 Saleshan landslide in China

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

Contact Info

Product

Resources

About