Formation and chemo-mechanical characteristics of weak clay interlayers between alternative mudstone and sandstone sequence of gently inclined landslides in Nanjiang, SW China

Liu, Jie; Liu, Fangzhou; Wang, Sen; Subramanian, Srikrishnan Siva; Wang, Liang; Xing, Qi

doi:10.1007/s10064-020-01859-y

Cited by 35 publications

(18 citation statements)

References 29 publications

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“…15. As a consequence, the friction angle is more effectively influenced by the soil-water interaction and dominates the strength behaviour of the shear-zone soil, which is also observed in the experimental works of other deep-seated landslides Xu et al (2015); Liu et al (2020).…”

Section: Time-dependent Soil-water Interactionmentioning

confidence: 52%

Soil–water interaction affecting a deep-seated landslide: From field monitoring to experimental analysis

Xuan

Wang

et al. 2022

Bull Eng Geol Environ

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Most deep-seated landslides are characterized by large volumes with deep shear surfaces. They are sensitive to hydrological forcing, especially in climate change scenarios. This paper studies the role of soil–water interaction in affecting the motion of a deep-seated landslide near the southeast coast of China, where seasonal rainfall combined with annual typhoons caused the instability of a previous stable slope. A comprehensive investigation consisting of field monitoring and experiments of soil–water interaction is carried out. The monitoring data show that the landslide exhibits alternate dormant and active stages, corresponding to rainy and dry seasons, respectively. The enduring precipitations predominate the landslide motion, while intensive rainfall brought by typhoon events leads to transient deformation. In addition, wet treatment of intact and reconstituted soils is adopted to mimic the interaction between rainwater and landslide material. The results obtained from in-situ and laboratory direct shear tests indicate that the soil–water interaction is time-dependent. The long-term interaction gives rise to significant strength reduction of soils, thereby regulating the movement of the landslide.

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Section: Time-dependent Soil-water Interactionmentioning

confidence: 52%

Soil–water interaction affecting a deep-seated landslide: From field monitoring to experimental analysis

Xuan

Wang

et al. 2022

Bull Eng Geol Environ

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“…The classification based on particle sizes and mineralogy can be connected to anticipate the physical properties of sediments (e.g., estimation of the permeability by particle sizes [33,34]. The physical and mechanical properties of soil formations are critical in quantitative and qualitative analyses of natural phenomena [35], the use of natural resources [36,37].…”

Section: Engineering Interpretations To Natural Phenomenamentioning

confidence: 99%

Impact of Particle Sizes, Mineralogy and Pore Fluid Chemistry on the Plasticity of Clayey Soils

et al. 2021

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The current classification of clayey soils does not entail information of pore fluid chemistry and particle size less than 75 µm. However, the pore fluid chemistry and particle size (at given mineralogy) are critical in the plasticity of clayey soils because of their impact on negative charge density. Therefore, this study extensively discusses the description of clay with respect to mineralogy, particle sizes, and pore fluid chemistry based on liquid and plastic limits of kaolinite, illite, and bentonite, and estimates undrained shear strength from the observed liquid limits. The liquid limits and undrained shear strength estimated from the observed liquid limits as a function of mineralogy (clay type), particle size, and ionic concentration reveal the need of incorporating pore fluid chemistry and particle size into the fines classification system. Furthermore, multiple linear regression models developed in this study demonstrate the importance of particle size and ionic concentration in predicting the liquid limit of clayey soils. This study also discusses the need for a comprehensive understanding of fines classification for proper interpretation of natural phenomena and engineering applications for fine-grained sediments.

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“…After landslide failure, the re-activated deposit and the barrier lake could cause secondary economic losses (Fan et al, 2015;Gischig et al, 2016;Liu et al, 2020), so emergency engineering is necessary (Xiao et al, 2021). This paper constructed an integrated monitoring system for landslide failure.…”

Section: Emergency Monitoring System For the Damaged Landslidementioning

confidence: 99%

Emergency Survey and Stability Analysis of a Rainfall-Induced Soil-Rock Mixture Landslide at Chongqing City, China

Zhou

Ai²,

Huang³

et al. 2021

Front. Earth Sci.

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The stability analysis of damaged landslides and unstable debris is important for rescue work and emergency operations. This paper investigates a predisposed geological emergence, inducing the factors and deformation processes of the Zhongbao landslide, which happened on July 25, 2020. The stability of the landslide debris was evaluated by an integrated monitoring system consisting of ground-based radar, unmanned aerial vehicles, airborne Lidar, thermal infrared temperature monitoring, GNSS displacement monitoring, deep displacement monitoring, and rainfall monitoring. The strata and weak layer controlled the landslide failure, and topography defined the boundary of the failed rock mass. A continually intensive rainfall caused the deformation and accelerated failure of the landslide. The shallow and steep deposit (Part I) firstly slid at a high velocity, and then pushed the rear part of the landslide (Part II) to deform, forming numerous cracks, which accelerated the rainfall infiltrating into the rock mass. The moisture content increase could decrease the strength of the shale rock within the bedding planes. Finally, with the rock and soil mass sliding along the weak layer, a barrier dam and a barrier lake were formed. The monitoring and numerical simulation results showed that after the landslide failure, there was still local collapse and deformation occurrences which threatened rescue work and barrier lake excavation, and the stability of the accumulation area gradually decreased as the rainfall increased. Therefore, the barrier dam was not excavated until the accumulation rate gradually stabilized on July 28. Moreover, most of the reactivated deposits still accumulated in the transportation and source areas. Thus, in August, the displacement of the landslide debris gradually accelerated in a stepwise manner, and responded strongly to rainfall, especially in the accumulation area, so that it was inferred that the damaged landslide could slide again and cause a more threatening and severe failure. The analysis results of the study area can provide references for the failure mechanism of a rainfall-induced landslide and the stability evaluation of a damaged landslide.

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Formation and chemo-mechanical characteristics of weak clay interlayers between alternative mudstone and sandstone sequence of gently inclined landslides in Nanjiang, SW China

Cited by 35 publications

References 29 publications

Soil–water interaction affecting a deep-seated landslide: From field monitoring to experimental analysis

Soil–water interaction affecting a deep-seated landslide: From field monitoring to experimental analysis

Impact of Particle Sizes, Mineralogy and Pore Fluid Chemistry on the Plasticity of Clayey Soils

Emergency Survey and Stability Analysis of a Rainfall-Induced Soil-Rock Mixture Landslide at Chongqing City, China

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