Field model experiments and numerical analysis of rainfall-induced shallow loess landslides

Sun, Peng; Wang, Haojie; Wang, Gang; Li, Rongjian; Zhang, Zhen; Huo, Xuting

doi:10.1016/j.enggeo.2021.106411

Cited by 54 publications

(28 citation statements)

References 28 publications

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“…However, the development of tension cracks in a landslide body, which generate dynamic water pressure during rainfall and provide dominant in ltration channels, often leads to shallow loess landslides. Deformation and damage to the slope crest caused by the development of cracks are key factors leading to landslides (Sun et al,2021;Wang et al,2021;Zhuang et al,2014;Tang et al,2015). When combining rainfall and seismic effects, it is very important to consider the in uence of dominant in ltration channels such as cracks.…”

Section: Discussionmentioning

confidence: 99%

Deformation Mechanism of the Zhoujiashan Landslide Under the Combined Effect of Rainfall and Earthquakes in Tianshui, Northwestern China

Ren

Sun

et al. 2022

Preprint

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Tianshui is located in a geomorphologic transitional zone with well-developed tectonics. Two historical earthquakes with magnitudes greater than 7.0 have occurred in Tianshui and its surrounding areas. The strata consist of primarily loess and mudstone, and geological disasters frequently occur. The Zhoujiashan landslide is a historical earthquake landslide that is currently relatively stable. To study its deformation and stability under the combined effect of rainfall and earthquake motion, the landslide was analyzed via field investigations, shaking table tests, and numerical calculations. The fastest responses were those of the pore water pressure and volume water content in the 0.3-m-depth range under rainfall conditions. The rainfall infiltration depth is limited to approximately 2 m and has a minimal impact on the overall stability of the slope. The response to earthquake accelerations increases with increasing elevation, and earthquakes have a significant amplification effect on structures with an inherent period of 0.2–0.4 s. Under 0.1-g and 0.3-g earthquake conditions, the slope deforms and the safety factor decreases but the landslide does not suffer overall failure. Under the 0.6-g earthquake condition, the slope liquefies, leading to the overall failure of the slope. The location of the liquefaction zone in the numerical calculation is in agreement with the actual situation. Under the 0.6-g earthquake condition, the overall failure mechanism of the slope is vibration liquefaction at the sliding surface.

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Section: Discussionmentioning

confidence: 99%

Deformation Mechanism of the Zhoujiashan Landslide Under the Combined Effect of Rainfall and Earthquakes in Tianshui, Northwestern China

Ren

Sun

et al. 2022

Preprint

Self Cite

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“…Field monitoring has been successfully used to observe the hydraulic and mechanical performance of slopes in different geological and climatic contexts (e.g., [ 7 , 17 , 21 , 22 , 31 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 ]). Particularly valuable data have been obtained from field experiments conducted on instrumented slopes subjected to increasing soil moisture conditions using rainfall simulators or controlled water inflows from trenches (e.g., [ 24 , 42 , 51 , 56 , 57 , 58 , 59 , 60 ]). Various laboratory devices have been successfully used to observe the HM response of intact or remolded soil samples undergoing conditions representative of soil elements on a slope during the rainfall infiltration (e.g., [ 61 , 62 , 63 , 64 ]).…”

Section: Introductionmentioning

confidence: 99%

The Use of Soil Moisture and Pore-Water Pressure Sensors for the Interpretation of Landslide Behavior in Small-Scale Physical Models

Peranić

Čeh

Arbanas

2022

Sensors

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This paper presents some of the results and experiences in monitoring the hydraulic response of downscaled slope models under simulated rainfall in 1 g. The downscaled slope model platform was developed as part of a four-year research project, “Physical modeling of landslide remediation constructions’ behavior under static and seismic actions”, and its main components are briefly described with the particular focus on the sensor network that allows monitoring changes in soil moisture and pore-water pressure (pwp). The technical characteristics of the sensors and the measurement methods used to provide the metrics are described in detail. Some data on the hydraulic and mechanical responses obtained from the conducted tests on slope models built from different soil types under different test conditions are presented and interpreted in the context of rainfall-induced landslides. The results show that the sensor network used is suitable for monitoring changes in the soil moisture and pwp in the model, both in terms of the transient rainfall infiltration through partially saturated soil and in terms of the rise in the water table and pwp build-up under fully saturated conditions. It is shown how simultaneous monitoring of soil moisture and pwp can be used to reconstruct stress paths that the monitored points undergo during different test phases. Finally, some peculiarities related to hydraulic hysteresis and surface erosion that were observed in some of tests are discussed, as well as possible difficulties in achieving and maintaining the targeted initial moisture distribution in slope models.

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“…Zhang et al [21,22] studied the water migration characteristics in loess under the rainfall condition in the realworld setting by carrying out artificial rainfall test and measuring the depth of water infiltration using the water sensor. Sun et al [23] carried out full-scale field slope rainfall tests under different rainfall conditions and studied the surface infiltration process and deformation characteristics of unsaturated loess slope, and the results showed that the water infiltration depth and infiltration rate increase with the increase of rainfall intensity during rainfall. In the above research, the monitoring time is limited, and the monitoring method is relatively single for the study on the water migration in soil.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of water migration characteristics in compacted loess subjected to rainfall infiltration

Zhang

Han

et al. 2022

PLoS ONE

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In order to study the effect of the rainfall infiltration on water migration in compacted loess, a model device was developed for testing water migration in the soil under rainfall conditions. In this study, the volumetric water content and resistivity of soil were introduced into the model test device. This model test device was applied to the study of water migration characteristics in compacted loess under different rainfall conditions. The results show that the resistivity decreases with the increase of the volumetric water content at the same depth of the loess column. In this way, the characteristics of the water migration can also be reflected from the change of the resistivity. There is an intimate relationship between the resistivity and volumetric water content, dry density. The volumetric water content and dry density are normalized by saturation of loess, arriving the equation of saturation against the resistivity. The characteristics of rainfall infiltration in compacted loess show a particular pattern, which demonstrates that, with the increase of dry density of the loess column, the rainfall infiltration line present “Y”, “D” and “Λ” shape distribution respectively, under light rain, heavy rain and rainstorm.

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Field model experiments and numerical analysis of rainfall-induced shallow loess landslides

Cited by 54 publications

References 28 publications

Deformation Mechanism of the Zhoujiashan Landslide Under the Combined Effect of Rainfall and Earthquakes in Tianshui, Northwestern China

Deformation Mechanism of the Zhoujiashan Landslide Under the Combined Effect of Rainfall and Earthquakes in Tianshui, Northwestern China

The Use of Soil Moisture and Pore-Water Pressure Sensors for the Interpretation of Landslide Behavior in Small-Scale Physical Models

Experimental study of water migration characteristics in compacted loess subjected to rainfall infiltration

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