A study of a flowslide with significant entrainment in loess areas in China

Zhang, Fanyu; Kang, Chao; Chan, Dave; Zhang, Xiaochao; Pei, Xiangjun; Peng, Jianbing

doi:10.1002/esp.4184

Cited by 45 publications

(12 citation statements)

References 55 publications

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“…Loess is characterized by looseness, porosity, and easy water seepage. It is easily eroded by flowing water to form gullies, which can easily cause subsidence and collapse [1][2][3][4]. Loess is widely distributed in Northwestern China, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Regional Freeze–Thaw Cycles on Loess Landslides: Analysis of Strength Deterioration of Loess with Changes in Pore Structure

Yang

Liu

2020

Water

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The loess landslide in Gaoling District of Xi’an, Shaanxi in China is closely related to the seasonal freeze–thaw cycle, which is manifested by the destruction of pore structure and strength deterioration of the loess body under freeze–thaw conditions. In order to study the relationship between macro-strength damage and pore structure deterioration of saturated loess under freeze–thaw conditions and its influence on the stability of landslides, this paper explores the effect of freeze–thaw cycles on the strength of saturated undisturbed loess through triaxial compression test, and explores the micro-microstructure changes of saturated undisturbed loess through scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR). This is to analyze the evolution of the pore structure and strength loss evolution of saturated loess during the freeze–thaw process, and to describe the freeze–thaw damage of saturated undisturbed loess through the change of porosity and strength deterioration. Then, the internal correlation expression between the porosity change and the strength degradation is established to realize the verification analysis of the test data based on the correlation model. The research results show that: (1) As the number of freeze–thaw cycles increases, the peak strength loss rate gradually increases, and the strength deterioration of saturated loess becomes more and more obvious. (2) The freeze–thaw cycle will lead to the development of pores and cracks in the sample, accompanied by the generation of new cracks, which will cause the deterioration of the pore structure of the sample as a whole. (3) The response of strength damage and porosity deterioration of saturated undisturbed loess is roughly similar under the freeze–thaw cycle. The change in porosity can be measured to better reflect the strength deterioration of saturated loess. Therefore, the change of pore structure of undisturbed loess under freeze–thaw cycle conditions is tested by field sampling and indoor tests to reflect the phenomenon of strength deterioration, thereby analyzing the stability of loess slopes.

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Section: Introductionmentioning

confidence: 99%

The Influence of Regional Freeze–Thaw Cycles on Loess Landslides: Analysis of Strength Deterioration of Loess with Changes in Pore Structure

Yang

Liu

2020

Water

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“…Loess has long been studied because of its collapsible mechanical properties. It is commonly reported that loess suffers a great loss of strength when subjected to wetting, for example after rainfall or irrigation, (Derbyshire et al, 1994;Muñoz-Castelblanco et al, 2011;Jiang et al, 2012;Zhang et al, 2017), and this property is believed to be the main reason for the frequently occurring collapse of shallow loess slopes (Zhang et al, 2009;Xu et al, 2011;Xu et al, 2014;Leng et al, 2018). Deeper failures have also been observed, sometimes in the form of landslides, but they are less understood.…”

Section: Introductionmentioning

confidence: 99%

The structure degradation of a silty loess induced by long-term water seepage

Zuo

Baudet

et al. 2020

Engineering Geology

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Loess is a typical silt-sized Aeolian soil that is widely deposited and possesses a fragile soil structure susceptible to collapse upon wetting. The instability of shallow loess slopes is well documented, but deeper failures triggered by rainfall and irrigation can also occur. In the case of long-term seepage, clay particles and salts have been observed to leach out of the loess slopes. This paper presents a systematic laboratory study of the effects of water conditions on the mechanical behaviour of silty loess, with isotropic compression and bender element tests carried out on natural and reconstituted loess recovered at 10m depth from a site in China. The results show that saturation causes reduction in both the compression yield stress and small strain stiffness of the soil, and that after being exposed to seepage, they decrease further.The possible mechanism of structure degradation is investigated by means of microscopic and chemical analyses, and it is found that seepage will cause the pore ions concentration to reduce with a loss of clay mineral bonding strength, resulting in the detachment of silt particles from aggregates. This work highlights the importance of monitoring the water outflow in the field at the loess slope edge, since it may causes large deformation in the long-term.

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“…Landslide has become the most damaging environmental hazard [1][2][3][4][5][6], and the main triggering factors of this hazard are rainfall [7][8][9][10][11][12][13] and earthquakes [14][15][16]. A problem in the analysis of water-related landslide is the lack of data on rainfall-triggered landslide (RTL).…”

Section: Introductionmentioning

confidence: 99%

Structural and Green Infrastructure Mitigation Alternatives Prevent Ciliwung River from Water-related Landslide

Prastica¹,

Apriatresnayanto²,

Marthanty³

2019

Int. J. Adv. Sci. Eng. Inf. Technol.

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Landslide is one of the most dangerous hazards worldwide. It could be caused by several factors and could have a massive destructive impact on the environment. A landslide event occurred in one of the urban cities in Indonesia. In the middle of 2002, a landslide disaster due to rainfall occurred in the Ciliwung River's floodplain, precisely in the South Jakarta area. The landslide profoundly affected large areas of the region and seriously injured many people. Several circumstances that could trigger landslide occurrences are the building load in the settlement area around the river, increase in the rainfall intensity, slope, and soil characteristics in the Ciliwung River area. This research proposes a combination of nonstructural and structural disaster mitigation methods for water-related landslide by investigating the safety factor (SF) of the river bank's slope in one of the impacted sites, i.e., the area under the main bridge of Grand Depok City regency. This site is located in the boundary area between Depok City and South Jakarta. The authors simulate analytical and numerical modeling to estimate the SF of the slopes. This research concludes that the minimum SF in the analyzed location is recognized as a safety criterion for society. The condition becomes less secure when an earthquake occurs. Furthermore, high rainfall intensity could become the worst scenario that generates considerable damage. The proposed structural mitigation for river bank with anchor or snail increases the SF. However, this reinforcement program is not recommended because of its high cost and ineffectiveness in solving problems. Hence, green infrastructure (GI) is highly suggested for nature-based mitigation to prevent rainfall-triggered landslides in the Ciliwung River area. The authors conduct the preliminary design of the study and recommend further analysis of GI or soil bioengineering to ensure its effectiveness and applicability in the research area.

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A study of a flowslide with significant entrainment in loess areas in China

Cited by 45 publications

References 55 publications

The Influence of Regional Freeze–Thaw Cycles on Loess Landslides: Analysis of Strength Deterioration of Loess with Changes in Pore Structure

The Influence of Regional Freeze–Thaw Cycles on Loess Landslides: Analysis of Strength Deterioration of Loess with Changes in Pore Structure

The structure degradation of a silty loess induced by long-term water seepage

Structural and Green Infrastructure Mitigation Alternatives Prevent Ciliwung River from Water-related Landslide

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