Discontinuous slope failures and pore-water pressure variation

Guo, Xiaojun; Li, Yong; Cui, Peng; Zhao, Wanyu; Jiang, Xing-yuan; Yan, Yan

doi:10.1007/s11629-015-3528-4

Cited by 15 publications

(2 citation statements)

References 17 publications

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“…It has area of 48.6 km 2 , and extends from its drainage divide at the elevation of 3269 m to its outlet at the elevation of 1042 m. It has frequently been impacted by tectonic activities (e.g., earthquakes), and deeply cut sloping terrain over a large range of elevation. This valley is known for the frequent occurrence of debris ows and its long-term observations of rainfall (Cui et al, 2005(Cui et al, , 2007Guo et al, 2013Guo et al, , 2016b. Many studies that have examined the mechanisms and triggering conditions of debris ows, which have also highlighted the importance of the spatial heterogeneity and the temporal process of local rainfall (e.g., Cui et al, 2005;Guo et al, , 2021a.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal stochastic event-rainfall process in a small mountainous catchment

cheng,

guo,

et al. 2023

Preprint

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The spatial distribution and temporal process of rainfall are important with respect to rainfall-induced hazards, which represent major problems in small mountainous catchments. This study considered the rainfall process as a stochastic process, and investigated its spatial variation and temporal evolution using data obtained from a dense monitoring network in a small catchment. The event-scale rainfall–elevation and rainfall–area relations were proposed, and the temporal process was investigated at 1-min resolution and characterized by an index that included the onset time, duration, and center time of the rainfall peak period at each gauge. Analysis of the errors associated with using the relations revealed that the errors were random and followed a normal distribution. Consequently, the rainfall process could be expressed asy = f(x) + ε, wheref(x)represents the specific deterministic relations used to estimate the rainfall parameters, andεrepresents the estimation errors. A stochastic simulation method that incorporates the deterministic empirical relations of rainfall amount and the stochastic process of rainfall errors was proposed to simulate the rainfall process at any gauge. The simulation procedure was described in detail and validated using real event-rainfall data, also the influence of gauge selection to the hydrological forecasting (e.g. water flood simulation and debris flow forecasting) was evaluated. This study marks an attempt to establish a framework for generation of the temporal process of rainfall at a high resolution (1-min) which is significant to the hydrological hazards forecasting, and could be extended to other unknown places, thereby realizing the spatial distribution of rainfall within a catchment.

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Section: Introductionmentioning

confidence: 99%

Spatiotemporal stochastic event-rainfall process in a small mountainous catchment

cheng,

guo,

et al. 2023

Preprint

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“…Among them, for soil pore water pressure, the presence and number of fine particles can significantly affect the pore water pressure [2][3][4]. For example, the vertical migration of fine particles in the slope profile affects the change of pore water pressure, and, in some cases, the effect of fine particle migration is more significant than the effects of mass and depth [5]. In addition, the content of fine particles has a significant effect on soil water content, and soil water-holding properties are closely related to particle composition [6], with particles of different sizes responding differently to water.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Migration of Soil Particles in Lateritic Soils under the Effect of Rainfall

Cao,

et al. 2023

Applied Sciences

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Rainfall is the main cause of erosion damage in loose slope deposits. During rainfall infiltration, fine particles in the soil mass will move with water infiltration, thus changing the localized particle distribution of the soil mass, which, in turn, causes changes in the pore water pressure and volumetric water content within the slope and ultimately affects slope stability. In order to develop advanced soil and water conservation programs to prevent slope damage, it is crucial to understand and accurately reproduce the particle migration and aggregation characteristics of soils under different rainfall conditions. Therefore, this paper systematically investigates the soil particle migration characteristics of the soil body under rainfall conditions by simulating the internal erosion of the lateritic soil slope body under rainfall conditions via slope internal erosion simulation experiments and experimentally analyzing the migration and aggregation of fine particles in the slope body, as well as the changed rules regarding pore water pressure and volumetric water content at different locations of the slope body with rainfall. The results of this study show that (1) with the infiltration of rainfall, the fine particles in the slope body mainly infiltrate in the vertical direction in an early stage of rainfall; in a later stage, there is vertical downward and down-slope seepage. Therefore, fine particles always gather at the toe of the slope, which leads to relatively high water content and pore water pressure at the toe of the slope, and thus, the slope is always damaged from the toe of the slope. (2) Inside the slope, the fine particles always gather at the smallest pore diameter. With the enhancement of hydrodynamic force, they will be lost again, which leads to a sudden decrease in the local volumetric water content of the slope, and the pore space increases. Then, it is filled with seepage water, which makes the pore water pressure fluctuate or increase. (3) Based on the particle distribution parameter, the present study produced a distribution map of the fine particle content of the slope body under different rainfall intensities and established a model of the dynamic change of fine particles, which improves the understanding of the effect of the change in the fine particle composition of the slope body on the water content and the pore water pressure and may be helpful for the assessment of the initiation of the mudslides.

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Investigating a potential reservoir landslide and suggesting its treatment using limit-equilibrium and numerical methods

Babanouri

Dehghani

2017

J. Mt. Sci.

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Discontinuous slope failures and pore-water pressure variation

Cited by 15 publications

References 17 publications

Spatiotemporal stochastic event-rainfall process in a small mountainous catchment

Spatiotemporal stochastic event-rainfall process in a small mountainous catchment

Characterization of the Migration of Soil Particles in Lateritic Soils under the Effect of Rainfall

Investigating a potential reservoir landslide and suggesting its treatment using limit-equilibrium and numerical methods

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