Field monitoring of rainfall infiltration in a loess slope and analysis of failure mechanism of rainfall-induced landslides

Tu, Xin; Kwong, Akl; Dai, Fuchu; Tham, LG; Hong, Min-Sun

doi:10.1016/j.enggeo.2008.11.011

Cited by 266 publications

(105 citation statements)

References 34 publications

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“…Chen et al (2007a) studied the deformation and stability of expansive soil slopes under wetting -drying cycle conditions using the centrifugal modelling test. Tu et al (2009) analysed the mechanism of the unsaturated soil during rainfall infiltration and rainfall-induced landslide instability. Zhang et al(2007) rainfall intensity or rainfall patterns.…”

Section: Introductionmentioning

confidence: 99%

Field Tests of Expansive Soil Embankment Slope Deformation Under the Effect of the Rainfall Evaporation Cycle

Wang¹

2017

Appl Ecol Env Res

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Abstract. In order to provide the necessarily basic parameters for designing the planned airport project in the An Kang area using expansion soil, a local physical model is being made, in particular to assess fill slope stability and for follow-up testing of the slope deformation under the effect of the rainfallevaporation cycle, and subsequent analysis of the law of evolution and formation mechanism of the slope deformation. The results show the following. (1) There are three stages of rainwater infiltration into newly-built fill slopes, free infiltration, scouring infiltration and erosion stable infiltration. In this experiment, the major rainwater infiltration process is the scouring infiltration stage, leading to the limited depth of infiltration. (2) For a completely uniform fill slope, the development of the deformation is affected by the leading role of the expansion soil deformation; the deformation of the top of the hill mainly shows vertical swell-shrink deformation, but the surface of the slope shows mainly horizontally cumulative deformation. With the increasing depth and rainfall frequency, the deformation rate drastically reduces. (3) The slope deformation is closely related to rainfall and evaporation, and rainfall is the main factor leading to the sharply increased deformation, evaporation is a necessary prerequisite for the development of the deformation. (4) Preventing rainfall and evaporation destruction and deformation of the slope should be commenced from two aspects: first, effectively reduce soil moisture variations of the slope influencing the scope on the surface, and second, prevent slope erosion and scouring by runoff.

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Section: Introductionmentioning

confidence: 99%

Field Tests of Expansive Soil Embankment Slope Deformation Under the Effect of the Rainfall Evaporation Cycle

Wang¹

2017

Appl Ecol Env Res

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“…Lime is very cheap materials and widely used to stabilize the loess, and this method has been used for more than thousand years. Recently, many scholars have studied the mechanism of stabilizing soil and the microreaction mechanism between lime and soil [1,2], and some important achievements have been obtained. Fly ash is the combustion leavings of fine-grinded coal in power generation.…”

Section: Introductionmentioning

confidence: 99%

Influence Factor Analysis on Strength of Lime-Fly Ash Loess

Zhang¹,

Zhang²

2013

ENG

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Lime-fly ash loess is composed of fly ash, lime and loess. It is a new material in subgrade backfill. Main factors to influence the strength of lime-fly ash loess are age, amount of fly ash and lime, ratio of fly ash to lime (1:K), and moisture content. In order to observe the effect of each factor influencing the strength of lime-fly ash loess and find out the relationship between each other, this paper adopted orthogonal test design to conduct unconfined compression tests. The result shows that 90d strength can be considered to calculate the strength of lime-fly ash loess in practice. And the most important factor to influence the 90d strength of lime-fly ash loess is the amount of fly ash and lime, the second is moisture content, and then is the ratio of fly ash to lime (1:K). These achievements are significant to the design and application of lime-fly ash loess in subgrade construction of loess areas.

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“…Because the average depth of loess reaches 50-80 m in Loess Plateau and climatic condition is semi-arid in study area (Wang et al, 2011c), soil water deficit results from higher evapotranspiration than the precipitation infiltration (Li et al, 2014), and the effect of surface infiltration on permanent groundwater table is very limited (Tu et al, 2009). In order to simplify the model calculation, this study assumes that soil water would be stable between the normal years in which the annual precipitation is similar.…”

Section: Wy Ppt Et Smentioning

confidence: 99%

GIS-based analysis for hotspot identification of tradeoff between ecosystem services: A case study in Yanhe Basin, China

Zheng

Feng

2016

Chin. Geogr. Sci.

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Abstract:Although the quantification and valuation of ecosystem services have been studied for a long time, few studies have specifically focused on the quantification of tradeoffs between ecosystem services and tradeoff hotspots. Based on previous studies of ecosystem service assessment, we proposed a feasible method to analyze the tradeoffs between ecosystem services, including determination of their relationship, quantification of tradeoffs, and identification of tradeoff hotspots. Potential influencing factors were then further analyzed. The Yanhe Basin in the Loess Plateau was selected as an example to demonstrate the application process. Firstly, the amounts of net primary production (NPP) and water yield (WY) in 2000 and 2008 were estimated by using biophysical models. Secondly, correlation analysis was used to indicate the tradeoffs between NPP and WY. Thirdly, tradeoff index (TI NPP/WY ) was established to quantify the extent of tradeoffs between NPP and WY, and the average value of TI NPP/WY is 24.4 g/(mm·m 2 ) for the Yanhe Basin between 2000 and 2008. Finally, the tradeoff hotspots were identified. The results indicated that the area of lowest tradeoff index concentrated in the middle part of the Yanhe Basin and marginal areas of the southern basin. Map overlapping was used for preliminary analysis to seek potential influencing factors, and the results showed that shrub was the best suited for growing in the Yanhe Basin, but also was a potential influencing factor for formulation of the tradeoff hotspots. The concept of tradeoff index could also be used to quantify the degree of synergy between different ecosystem services. The method to identify the tradeoff hotspots could help us to narrow the scope of study area for further research on the relationship among ecosystem services and concentrate on the potential factors for formation of tradeoff between ecosystem services, enhance the capacity to maintain the sustainability of ecosystem.

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Field monitoring of rainfall infiltration in a loess slope and analysis of failure mechanism of rainfall-induced landslides

Cited by 266 publications

References 34 publications

Field Tests of Expansive Soil Embankment Slope Deformation Under the Effect of the Rainfall Evaporation Cycle

Field Tests of Expansive Soil Embankment Slope Deformation Under the Effect of the Rainfall Evaporation Cycle

Influence Factor Analysis on Strength of Lime-Fly Ash Loess

GIS-based analysis for hotspot identification of tradeoff between ecosystem services: A case study in Yanhe Basin, China

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