Simultaneous analysis of slope instabilities on a small catchment-scale using coupled surface and subsurface flows

Zhu, Yulong; Ishikawa, Tatsuya; Subramanian, Srikrishnan Siva; Luo, Bin

doi:10.1016/j.enggeo.2020.105750

Cited by 33 publications

(16 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the intensification of global and regional climate change, extreme rainfall events and huge flooding have occurred frequently in recent years (Paerl et al, 2020;Wei et al, 2020). The decrease in matric suction in the unsaturated zone caused by rainwater infiltration under torrential rain is considered the main cause of the landslide/slope failure initiation (Zhu et al, 2020). After the landslide/slope failure occurs, the collapsed soil moves downward, namely landslide runout, threatening the lives and properties of residents living downslope, especially those living near the foothills.…”

Section: Introductionmentioning

confidence: 99%

A FEM-MPM hybrid coupled framework based on local shear strength method for simulating rainfall/runoff-induced landslide runout

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

A FEM-MPM hybrid coupled framework based on local shear strength method for simulating rainfall/runoff-induced landslide runout

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Rainfall is considered a key factor for triggering slope failure, and more than thousands of rainfallinduced slope failures occur around the world every year (Rahardjo et al, 2005;Zhang et al, 2014;Van Asch et al, 2018;Zhu et al, 2020a). Particularly, the different rainfall conditions/types cause slope failure to occur in different patterns, for example, heavy rainfall like rainstorms or torrential rain will make the surface layer of the soil saturated in a short time (Zhu et al, 2020b).…”

Section: Introductionmentioning

confidence: 99%

A determination method of rainfall type based on rainfall-induced slope instability

et al. 2022

Self Cite

View full text Add to dashboard Cite

This work presents a determination method of rainfall types based on rainfall-induced slope instability to eliminate the current dilemma of the inconsistent classi cation of rainfall types. Firstly, 5,808 scenarios of slope instability are simulated with 11 kinds of soil properties under 528 designed intensity-duration (I−D) conditions. Then through analysis of the I−D conditions when slope failure occurred, rainfall is classi ed into two types: short-duration − high-intensity (SH) type, and long-duration − low-intensity (LL) type. According to the analysis results, it indicates that rainfall types affect the initiation of slope failure, i.e., different I−D conditions will affect the slope failure initiation under LL type rainfall, while the slope failure initiation will not be affected by the change of I−D conditions under SH type rainfall. In addition, the results show that the classi cation of rainfall types does not depend on the soil shear strength parameters (cohesion and internal friction angle), although the change of soil shear strength parameters will cause the shift of threshold curve of slope failure in the I−D conditions two-dimensional (2D) plane.The ndings in this study bene t to understanding the effect of rainfall type on the mechanism of slope failure initiation, which will promote the development of an early warning system of slope failure in the future by considering the identi cation of rainfall types. Highlights 1. Rainfall can be classi ed into SH type and LL type.2. Classi cation of rainfall types does not depend on soil shear strength parameters.3. Rainfall types affect the initiation of slope failure.

show abstract

“…Rainfall-induced landslides can contribute to serious human casualties and cause property damage (e.g., Ebel et al 2010;Kang and Lee 2018;Kim et al 2017). Heavy rainfall can cause slope failures because of the infiltration of rainfall into the slopes, triggering the following sequential changes: an increase in the unit weight of soil because of an increase in its water content (Cho and Lee 2001;Ng and Shi 1998); and a decrease in the effective stress as a result of the loss of matric suction, which leads to a reduction in the shear strength (Chen et al 2017;Yeh et al 2008;Zhu et al 2020). An increase in groundwater or lateral water flow underground and general pressure changes at the foot of a slope can affect slope stabilizing processes (Ehlers et al 2011;Germer and Braun 2011;Wienhöfer et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Effects of coupled hydro-mechanical model considering dual-phase fluid flow on potential for shallow landslides at a regional scale

Kang

Kim

2021

Nat Hazards

View full text Add to dashboard Cite

A total of 36 rainfall-induced shallow landslides occurred on July 26 and 27, 2011, on Halmidang Mountain, Gyeonggi Province, South Korea. To precisely analyze these shallow landslides, a coupled hydro-mechanical model is applied that considers the dual-phase fluid flow of water and air and the deformation-dependence of the water retention behavior with hydraulic hysteresis. The changes in the pore pressures and saturations of the water and air are obtained from an infiltration analysis and are used to calculate the safety factor in a slope stability assessment. A comparison of the results from single-and dual-phase flow models is used to investigate the effects on the slope stability of the air flow and variations in the hydraulic conductivity resulting from the stress-strain behavior. The results suggest that considering the air flow in the hydro-mechanical coupling affects the increase rate of the pore water pressure, thus influencing the safety factor when ponding is more likely to occur during heavy rainfall. Finally, landslide assessments are conducted using the dual-phase flow model, which is slightly more consistent with actual landslide events than the single-phase flow model.

show abstract

Simultaneous analysis of slope instabilities on a small catchment-scale using coupled surface and subsurface flows

Cited by 33 publications

References 33 publications

A FEM-MPM hybrid coupled framework based on local shear strength method for simulating rainfall/runoff-induced landslide runout

A FEM-MPM hybrid coupled framework based on local shear strength method for simulating rainfall/runoff-induced landslide runout

A determination method of rainfall type based on rainfall-induced slope instability

Effects of coupled hydro-mechanical model considering dual-phase fluid flow on potential for shallow landslides at a regional scale

Contact Info

Product

Resources

About