Root Reinforcement Effect on Cover Slopes of Solid Waste Landfill in Soil Bioengineering

Park, Jeong-Jun; Kim, Indae; Kang, Jeong-Ku

doi:10.3390/su13073991

Cited by 6 publications

(4 citation statements)

References 33 publications

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“…Adding a root system can/significantly minimize the strainsoftening effect and concurrently increase soil shear strength metrics compared to the absence of a root system (Hallett, 2010;Pollen-Bankhead and Simon, 2010;Park et al, 2021;Su et al, 2021). The closer the sample is to the optimum moisture content, the more pronounced the root reinforcement effect is.…”

Section: Triaxial Shear Test Resultsmentioning

confidence: 99%

Study on erosion and stability of the ecological slope

Tao

Lei²,

Gong³

et al. 2023

Front. Earth Sci.

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Rainfall is the main influencing factor causing slope erosion, landslide, and instability in loess; thus, it is vital to comprehend the process of rainfall erosion on various slope surfaces and water penetration inside the slope. In this paper, the loess sample is from Heifangtai in Gansu Province, and triaxial shear tests were conducted on loess with roots under varying water contents to evaluate the slope-reinforcing impact of roots. The slope surface erosion process was analyzed using a soil moisture sensor and matric suction meter to monitor the variation of matric suction in the middle slope and slope foot in response to varying precipitation levels. The numerical simulation approach is utilized to analyze the fluctuation of slope stability under the effect of varying rainfall intensities and humid heat, and the analytical solution of the safety factor is compared to the model solution. The results indicate that the shortest generation time for bare slope runoff is 6 min, whereas the greatest generation time for the Bermuda grass slope is 12 min; the shorter the period, the less water penetration and the simpler it is to reach the slope erosion stage. The slope’s rise increases runoff velocity, strengthening water resistance on the slope surface. When the test slope is 30°, the maximum mass of scouring sediment on the bare slope is 15.2 g from 24 to 36 min, compared to 14.7 g from 24 to 36 min when the test slope is 60°. The amount of scouring reduces as the slope increases. The slope safety factor declined from 3.51 to 2.84 after 24 h of heavy rain, and the loss rate accelerated as the rainfall intensity increased.

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Section: Triaxial Shear Test Resultsmentioning

confidence: 99%

Study on erosion and stability of the ecological slope

Tao

Lei²,

Gong³

et al. 2023

Front. Earth Sci.

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“…Several studies have demonstrated that the twisting and strengthening of plant roots in soil can impede the expansion and contraction of the soil [27][28][29][30][31][32]. As a solution for slope protection, green ecological models have been utilized in engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Research on the mechanism of plant root protection for soil slope stability

Cao,

Zhang,

Chen

et al. 2023

PLoS ONE

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In order to investigate the impact of herbaceous root development on soil slope stability in expansive soil areas, the research was conducted in the soil slope experimental area of Yaoshi Town, Shangzhou District, Shangluo City. Three types of herbaceous plants, namely Lolium perenne, Medicago, and Cynodon dactylon, were planted to examine their influence on slope stability. The results indicated that Lolium perenne had significantly higher root length density and root surface area density compared to Cynodon dactylon and Medicago. However, the root weight density of Cynodon dactylon was found to be highest. The roots of Lolium perenne, Cynodon dactylon, and Medicago were predominantly observed in diameter ranges of 0 < L ≤ 1.0 mm, 0 < L ≤ 2.5 mm, and 2.5 < L ≤ 3.0 mm, respectively. The roots of herbaceous plants have the ability to enhance water retention in soil, resist hydraulic erosion of slope soil, and reduce soil shrinkage and swelling. During the initial phase of herbaceous planting, there is an accelerated process of organic carbon mineralization in the soil. The roots of herbaceous plants play a crucial role in soil consolidation and slope protection. They achieve this by dispersing large clastic particles, binding small particles together, altering soil porosity, enhancing soil water retention, and reducing soil water infiltration. It was found that Lolium perenne and Medicago, which have well-developed roots, exhibited superior slope protection effects. These findings contribute to the theoretical understanding for the implementation of green ecological protection technology on soil slopes.

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“…At the hillslope scale, the presence of vegetation generally increases soil thickness, lowering the frequency of landslide events [10]. Tree roots are regarded as a factor determining the stability of hillsides and riverbanks and can prevent the direct inflow of rainfall on the slope's surface, thus providing stability against surface layer loss and scouring [11] and delaying the process of erosion and massive waste [12][13][14]. Plant roots can enhance slope stability [15][16][17], and their effects are exerted through basal root reinforcement and lateral root reinforcement [18].…”

Section: Introductionmentioning

confidence: 99%

The Pullout Mechanical Properties of Shrub Root Systems in a Typical Karst Area, Southwest China

Ruan¹,

Tang²,

Huang³

2022

Sustainability

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Roots play a major role in reinforcing and stabilizing soil. The pullout mechanical characteristics of soil reinforcement and slope protection of the root systems of dominant shrub species (Pyracantha and Geranium) were estimated by in-situ pullout tests in a karst area, in which roots were pulled out from soil to reliably test the pulling force. The goals of this study were to discover the pullout mechanical properties of roots in karst areas and to try to analyse the impact of the root system on landslide control. The F–s curves were multipeak curves with a noticeable main peak and main double peaks. The curves showed a linear increasing trend at the initial stage of drawing and decreased rapidly after reaching the peak. The F–s curves of root systems inserted into rock cracks showed secondary fluctuations in the later stage of drawing, and rock cracks stimulated the tensile efficiency of the root system more effectively. Field in situ pullout results indicate that tree roots fail progressively rather than simultaneously. The maximum pulling force had a linear relationship with the increase in soil thickness and a disproportionate increasing trend with the increasing number of broken roots. The displacement of the maximum peak was different between the two tree species and was concentrated at 5–15 cm and 5–25 cm for Pyracantha and Geranium, respectively. The maximum pulling force of Geranium was 1.29 times that of Pyracantha, and the root system of Geranium had strong pullout resistance. We concluded that the peak distribution of the F–s curves was affected by broken roots and rock cracks, while soil thickness and the number of broken roots had positive effects on the maximum pulling force, all of which is helpful in understanding the effect of root pullout mechanical properties on landslides in karst areas.

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Root Reinforcement Effect on Cover Slopes of Solid Waste Landfill in Soil Bioengineering

Cited by 6 publications

References 33 publications

Study on erosion and stability of the ecological slope

Study on erosion and stability of the ecological slope

Research on the mechanism of plant root protection for soil slope stability

The Pullout Mechanical Properties of Shrub Root Systems in a Typical Karst Area, Southwest China

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