Research on the protection of expansive soil slopes under heavy rainfall by anchor-reinforced vegetation systems

Xu, Yingzi; Su, Chao; Huang, Zhen; Yang, Chunyan; Yang, Yunhe

doi:10.1016/j.geotexmem.2022.07.006

Cited by 19 publications

(9 citation statements)

References 30 publications

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“…The previously described soilbag stabilization method prevents rainwater infiltration and limits the lateral deformation of expansive soil [115]. Xu et al [131,132] proposed an anchor-reinforced vegetation system (ARVS) consisting of vegetation, anchors, and high-performance turf reinforcement mats (HPTRMs). The results indicated that this system effectively prevented large fluctuations in soil water content, restrained the swelling-shrinkage deformation of slopes (Figure 10), and provided superior slope protection [133].…”

Section: Limitation Of Swelling-shrinkage Deformationmentioning

confidence: 99%

Failure Mechanisms and Protection Measures for Expansive Soil Slopes: A Review

Luo,

2024

Sustainability

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Due to the significant hydrophilicity and cracking properties of expansive soils, expansive soil slopes are prone to destabilization and landslides after rainfall, seriously threatening the safety of buildings, highways, and railroads. Substantial economic losses often accompany the occurrence of expansive soil slope disasters; thus, it is of great significance to understand the slope failure mechanisms experienced by expansive soil slopes and to prevent expansive soil slope disasters. In this paper, the current research status of the landslide failure mechanism of expansive soil slopes is systematically reviewed based on three research methods: field test, model test, and numerical simulation. The failure mechanisms of expansive soil slopes and the main influencing factors are summarized. Based on the failure mechanisms, three protection principles (waterproofing and water blocking, swelling–shrinkage deformation limitation, and crack inhibition and strength enhancement) that can be followed for disaster prevention of expansive soil slopes are proposed. The research status and advantages and disadvantages of these protection methods are reviewed, and future researchable directions of the stability of expansive soil slopes and slope protection methods are explored. Based on the previous work, a new flexible ecological slope protection system with a double waterproof layer is proposed for expansive soil slopes to realize ecological, efficient, and long-term protection. This paper thus aims to provide technical reference for the prevention and control of slope engineering disasters in expansive soil areas.

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Section: Limitation Of Swelling-shrinkage Deformationmentioning

confidence: 99%

Failure Mechanisms and Protection Measures for Expansive Soil Slopes: A Review

Luo,

2024

Sustainability

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“…In recent years, there has been a growing interest in the technical and economic advantages, as well as the ecological benefits, of using ecological slope protection methods. The concept of “treating expansion with flexibility and green protection” has emerged as a novel approach to expansive soil protection management 5 , 18 . These studies have demonstrated the reinforcing effect and ecological restoration potential of environmental protection measures on slope engineering 19 , and have emphasized the close relationship between the root system and soil cracks 20 – 24 , as well as the strong correlation between root growth characteristics and slope stability 25 , 26 .…”

Section: Introductionmentioning

confidence: 99%

Study on Cynodon dactylon root system affecting dry–wet cracking behavior and shear strength characteristics of expansive soil

Guo

Huang

et al. 2023

Sci Rep

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Expansive soil exhibits remarkable characteristics of water absorption expansion and water loss shrinkage, rendering it susceptible to cracking under the alternating dry–wet environments of nature. The generation and development of cracks in expansive soil can result in catastrophic engineering accidents such as landslides. Vegetation protection is an important approach to stabilizing expansive soil slopes and fulfilling ecological protection requirements. In this study, through indoor experiments and theoretical analysis methods, the effects of Cynodon dactylon roots on the crack development and shear strength of expansive soil subjected to dry–wet cycles were analyzed, and the relationship between the crack development and shear strength decay in root-doped expansive soil was explored. Furthermore, the mechanism of vegetative root system action was elucidated. The results show that the Cynodon dactylon root system exerts a significant inhibitory effect on crack development in expansive soil. The crack indexes of root-doped expansive soil exhibit significant phase characteristics during the process of dry–wet cycles. The crack-blocking and reinforcing effect of the root system becomes pronounced as the root-to-soil mass ratio increases and the root diameter decreased. Moreover, the process of crack development in expansive soil is accompanied by a decrease in soil shear strength. The quantitative relationship between crack development and shear strength decay can serve as a basis for predicting the stability of slope soil. Overall, the results highlight the potential of vegetation-based approaches in protecting slopes with expansive soils and have practical implications for ecological protection and engineering design in areas with expansive soils.

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“…The literature indicated that extreme precipitation events over the world had intensi ed remarkably in recent years (S. Robinson et al 2017;Yamamoto 2022). In addition, several studies reported that East Asian region has experienced a pronounced increasing rainfall trend (Iqbal et al 2021), which triggered massive oods with complex intra and interannual patterns (Al Sawaf et al 2021;Xu et al 2022). Furthermore, future hydrological scenarios implemented for East Asia suggest that river ow at the end of the current century will increase due to increases in precipitation rate (Higashino and Stefan 2019; Sato et al…”

Section: Introductionmentioning

confidence: 99%

Investigating rainfall-runoff and turbidly behavior during the rainy season in west of Japan

Sawaf

Kawanisi

Bahreinimotlagh³

2023

Preprint

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Understanding the recent variability in massive rainfall patterns is essential to provide a clear image about underlying hydrological processes that occur over a watershed scale. The main objective of this study is to investigate the variability of rainfall events in Western Japan as a result of climate change and examine the related runoff-turbidity dynamics during rainy season. To fulfill the research objectives, we investigated the changeability of the precipitation records in the Gōno River watershed for the last two decades and the related runoff-turbidity behavior during floods using the turbidity-discharge (T-Q) loops and quantified using an improved hysteresis index. The findings revealed a kind of intense rainfall periodicity of 3 ~ 4 years. In addition, spatial pentads analysis exhibited various intensities of accumulated precipitation suggesting that there is no specific spatial zone of extreme rainfall. Regarding the turbidity-discharge behavior, it was found that clockwise hysteresis patterns were induced by sediment sources from near channel areas, alternatively, anticlockwise pattens were produced due to soil erodibility from the nearby areas. Another interesting finding was a notable behavior of turbidity during floods such as “bursts” or “local peaks” may represent an earlier (or later) arrival of turbid waters from nearby distant sources at an upstream section as a result of an intense precipitation. One of the fundamental challenges in the quantification of hysteresis patterns is that there is no accepted definition on how to determine the start and the end of a flood event which may led to a bias in the quantification of these patterns.

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Research on the protection of expansive soil slopes under heavy rainfall by anchor-reinforced vegetation systems

Cited by 19 publications

References 30 publications

Failure Mechanisms and Protection Measures for Expansive Soil Slopes: A Review

Failure Mechanisms and Protection Measures for Expansive Soil Slopes: A Review

Study on Cynodon dactylon root system affecting dry–wet cracking behavior and shear strength characteristics of expansive soil

Investigating rainfall-runoff and turbidly behavior during the rainy season in west of Japan

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