Effects of Neyraudia reynaudiana roots on the soil shear strength of collapsing wall in Benggang, southeast China

Huang, Mengyuan; Sun, Shujun; Feng, Kaijun; Lin, Mengqi; Shuai, Fang; Zhang, Yue; Lin, Jinshi; Ge, Hongli; Jiang, Fangshi; Huang, Yanhe

doi:10.1016/j.catena.2021.105883

Cited by 16 publications

(31 citation statements)

References 35 publications

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“…However, soils with different properties have very different characteristics for the root-soil interface formed by the roots, resulting in soil blocks reinforced with roots with different shear resistance effects. At present, the WWM has only been revised from the perspective of root systems (Huang et al, 2021), and the influence of the agglomeration effect resulting from root-soil interfaces on the additional cohesion is ignored. Based on these two considerations, the WWM needs to be revised.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, plant roots prevent slope erosion mainly through the reinforcing effect of shallow fine roots and the anchoring effect of deep coarse roots (Docker & Hubble, 2009; Khairuddin et al, 2017). Huang et al (2021) found that the shear strength of rooted soil in collapsing walls first increased and then decreased with increasing root weight density (RWD), while cohesion linearly increased as root density increased (Liu et al, 2021). Soil is in direct contact and experiences friction with the root system, and it is also the key to realising the shear stress transformation and reinforcing soil by plant roots (Gray & Leiser, 1982).…”

Section: Introductionmentioning

confidence: 99%

“…These studies show that, due to the varied characteristics of different soils, the effects of soil reinforcement by root systems are different. However, since the 1980s, researchers have been devoted to exploring the reinforcement effect of roots from the perspective of plant species (Adhikari et al, 2013), RWD (Ajedegba et al, 2019; Huang et al, 2021; Loades et al, 2010), root area ratio (Ye et al, 2017) and root distribution form (Zhang et al, 2010). These studies did not include the role of the soils in the root–soil complex.…”

Section: Introductionmentioning

confidence: 99%

“…De Baets et al (2008) argued that these assumptions do not hold true in most cases. The WWM has been revised according to experimental conditions, and the correction coefficients range from 0.03 to 0.50 (Huang et al, 2021; Pollen, 2007; Schwarz et al, 2010; Shewbridge & Sitar, 1989). However, soils with different properties have very different characteristics for the root‐soil interface formed by the roots, resulting in soil blocks reinforced with roots with different shear resistance effects.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Dicranopteris linearis roots on the shear strength of different soil layers in collapsing wall of Benggang

Zhou

Shuai

Chen

et al. 2022

European J Soil Science

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‘Benggang’ is a local term for a widespread type of severgully erosion with steep collapsing walls in granitic, low, hilly areas of southern China, and its development and expansion are closely related to the shear strength of the collapsing wall. Plant roots play an important role in improving soil shear strength. However, the shear strength of root‐soil complexes in different layers of collapsing walls remains obscure. We selected Dicranopteris linearis fern roots and adopted the direct shear method to evaluate the effect of root weight density (RWD) (0–1.25 g 100 cm−3) on the shear properties of the lateritic, sandy and detritus layers. The results showed that roots could enhance soil shear strength, and the maximum increase in the lateritic layer was 11.53%, higher than that in the sandy (5.84%) and detritus layers (3.17%). As the root content increased, the cohesion of the sandy and detritus layers increased and then decreased, and their maximum increase in cohesion and the fitting optimal RWD were lower than those of the lateritic layer. The internal friction angle was not affected by roots. When the root content was constant, the shear strength and cohesion of the lateritic layer were significantly higher than those of the sandy and detritus layers, while their internal friction angle was significantly lower than that of the latter two layers. The average increment of soil cohesion calculated by the Wu‐Waldron model (WWM) was 10.52 kPa, which was 0.30, 3.75 and 19.38 times the measured average values of the lateritic, sandy and detritus layers, respectively. The correction coefficient k′ was 0.02–1.18, and the truek'¯$$ \overline{k\hbox{'}} $$ in the lateritic layer was the highest (0.82), followed by that in the sandy and detritus layers. By combining the modified WWM with Coulomb's formula, new shear strength equations for root‐soil complexes of D. linearis were established. The predicted shear strength compared well with the measured shear strength (R2 > 0.90, NSE >0.90). Overall, the roots only had a significant reinforcement effect on the lateritic layer, and they could still not change the mechanical properties of the collapsing wall, which were more stable in the upper layers and weaker in the bottom. Therefore, other measures should be taken in the bottom layers to improve the stability of Benggangs. Highlights Effect of D. linearis roots on the shear strength of collapsing walls in Benggang was studied. Roots could improve collapsing‐wall soil shear strength, mainly reflected in the cohesion. The roots enhancement effect in lateritic layer was better than that of sandy and detritus layers. New shear strength equations of root‐soil complexes were established based on the Wu‐Waldron model.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impact of Dicranopteris linearis roots on the shear strength of different soil layers in collapsing wall of Benggang

Zhou

Shuai

Chen

et al. 2022

European J Soil Science

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“…In recent years, scholars have conducted several studies on the soil consolidation effect of plant roots. Indoor or field tests have confirmed the ability of plant roots in significantly improving the shear strength and ductility of soil [1][2][3][4][5][6][7][8][9] . These research results have shown that the natural attributes of roots considerably affected the soil consolidation effect, such as their species [10][11][12][13][14][15] , growth age [16][17][18][19] , and root morphology [20][21][22][23][24] .…”

mentioning

confidence: 99%

Deformation characteristics test and mechanism of arbor taproot soil complex in rainforests

Zhou

Liu³

et al. 2023

Sci Rep

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This study performed large-scale single shear tests on Haikou red clay and arbor taproot to explore the anti-sliding effect and deformation characteristics of rainforest arbor roots under a shallow landslide. The law of root deformation and the root–soil interaction mechanism were revealed. The results indicated the significant reinforcing effect of arbor roots on the shear strength and ductility of soil, which increased with the decrease of normal stress. The soil reinforcement mechanism of arbor roots was attributed to their friction and retaining effects through an analysis of the movement of soil particles and the deformation pattern of roots during the shear process. The root morphology of arbors under shear failure could be described using an exponential function. Consequently, an advanced Wu model which better reflected the stress state and deformation of roots was proposed based on the concept of curve segment superposition. The results are believed to a reliable experimental and theoretical basis for the in-depth study of soil consolidation and sliding resistance effects of arbor roots, and further lay a foundation for the slope protection by arbor roots.

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Assessing the mechanical effects of vegetation on the stability of slopes with different geometries and soil types

Chen,

Yang,

Zhou

2023

Bull Eng Geol Environ

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Effects of Neyraudia reynaudiana roots on the soil shear strength of collapsing wall in Benggang, southeast China

Cited by 16 publications

References 35 publications

Impact of Dicranopteris linearis roots on the shear strength of different soil layers in collapsing wall of Benggang

Impact of Dicranopteris linearis roots on the shear strength of different soil layers in collapsing wall of Benggang

Deformation characteristics test and mechanism of arbor taproot soil complex in rainforests

Assessing the mechanical effects of vegetation on the stability of slopes with different geometries and soil types

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