The effect of water content on the shear strength characteristics of granitic soils in South China

Wei, Yujie; Wu, Xi; Xia, Jinwen; Miller, Gerald A.; Cai, Chang; Guo, Zhen; Hassanikhah, Arash

doi:10.1016/j.still.2018.11.013

Cited by 70 publications

(33 citation statements)

References 38 publications

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“…The movement and rearrangement of soil particles are influenced by the water content [27]. In this study, the soil shear strength was significantly influenced by the water content, which is consistent with other studies [13,28,29]. Under the same vertical pressure, the total pressure required for soil destruction decreases with increasing water content, resulting in easier destruction of the soil samples (Figures 4 and 5).…”

Section: The Shear Strength Of the Test Soils Decreases Obviously Witsupporting

confidence: 90%

“…In addition, the friction between the soil particles changes to friction between the soil particles and the water membrane, meaning the friction coefficient gradually decreases [36], resulting in decreasing internal friction angle. In addition, the internal friction angle is also affected by other factors, including the soil particle components, particle size, and compaction [13].…”

Section: The Shear Strength Of the Test Soils Decreases Obviously Witmentioning

confidence: 99%

“…Among them, it is very important and necessary to study the stability of new paddy field construction. Soil shear strength is a useful dynamic measure for evaluating the soil stability of engineering technology [12][13][14] and an important input parameter in the design of precise tillage and large agricultural instruments. The basic reason for the instability of the paddy field surface is that the shear stress on a certain surface inside the soil reaches its shear strength, thus destroying the stable balance.…”

Section: Introductionmentioning

confidence: 99%

“…The cohesion and internal friction angle are commonly used in engineering design to measure changes in the soil shear strength. In particular, the alteration of hydrologic conditions is the most important factor in bonding force variation, thus affecting the shear strength [13,16]. The effect of the water content on shear strength, as one of the hot topics in soil mechanics and land consolidation engineering, has been widely investigated in recent years [13,17].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the alteration of hydrologic conditions is the most important factor in bonding force variation, thus affecting the shear strength [13,16]. The effect of the water content on shear strength, as one of the hot topics in soil mechanics and land consolidation engineering, has been widely investigated in recent years [13,17]. However, different results regarding the relationship between the shear strength properties and the water content have been reported according to locations, soils, and experimental designs [18,19].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Determining the Shear Strength and Permeability of Soils for Engineering of New Paddy Field Construction in a Hilly Mountainous Region of Southwestern China

Han

Gao

et al. 2020

IJERPH

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As a constructed wetland ecosystem, paddy field plays an irreplaceable role in flood storage and detention, groundwater replenishment, environmental protection, and ecological balance maintenance. New paddy field construction can give full play to the production and ecological functions of paddy field and can adjust the development structure of the agricultural industry effectively. The soil properties of shear strength and permeability, which provide a theoretical basis for engineering design, construction, and post-operation, are important indexes in the site selection of new paddy field. The shear strength and permeability properties of soils from different land use types (vegetable field, gentle slope dryland, corn field, grapery, and abandoned dryland) for engineering new paddy field construction were investigated in this study. The results showed that the soil water content had a significant effect on the soil shear strength, internal friction angle, and cohesion. The total pressure required for soil destruction decreased with increasing water content under the same vertical pressure, resulting in easier destruction of soils. The internal friction angle decreased with increasing soil water content, and the soil cohesion first increased and then decreased with increasing soil water content. Considering that paddy fields were flooded for a long time, the soil strength properties had certain water sensitivity. Effective measures must be taken to reduce the change in soil water content, so as to ensure the stability of the embankment foundation, roadside ditch foundation, and cutting slope. In addition, the influence of changing soil water content on the strength properties of paddy soils should be fully considered in engineering design and construction, and the soil bulk density at the plough pan should reach at least 1.5 g cm−3 or more to ensure better water retention and the anti-seepage function of paddy field. The study can provide construction technology for engineering new paddy field construction in a hilly mountainous region of southwestern China.

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Section: The Shear Strength Of the Test Soils Decreases Obviously Witsupporting

confidence: 90%

Section: The Shear Strength Of the Test Soils Decreases Obviously Witmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Determining the Shear Strength and Permeability of Soils for Engineering of New Paddy Field Construction in a Hilly Mountainous Region of Southwestern China

Han

Gao

et al. 2020

IJERPH

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show abstract

Effect of weathering on short‐ and long‐term mechanical behaviour of granitic soils from the Benggang area under unloading conditions

Zhang

Chen

Yuan

et al. 2023

Earth Surf Processes Landf

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As regional soils collapse during the development of Benggang landforms, the release of geostress results in soil disintegration. This phenomenon is associated with soil instability, and it necessitates a study on the mechanical behaviour of decomposed granitic soils in response to unloading in the Benggang area. This study addressed the short‐ and long‐term mechanical behaviour of granitic soils with various degrees of weathering in response to unloading. Triaxial unloading and multi‐stage unloading creep tests were performed, including a comparative study of consolidated undrained (CU) triaxial tests. The deformation characteristics of granitic soils differed with the degree of weathering and the initial stress level. The most significant adverse effect of creep behaviour under unloading and undrained conditions was found in granitic soils with the greatest loss rate of maximum shear stress in contrast to the cases of CU compression and one‐time unloading. Additionally, increasing time‐dependent deformation was observed with increasing degree of weathering and initial stress level, which suggested that creep behaviour under unloading conditions accelerated soil erosion and instability in the Benggang area. The results of this study highlighted the potential influences of geostress release and time‐dependent deformation on soil instability in the Benggang area and advanced the understanding of mechanical mechanisms during the development of Benggang landforms.

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Dynamics of run‐off hydraulic characteristics during gully headcut erosion driven by head height

Tang,

Liao,

Lin

et al. 2023

Earth Surf Processes Landf

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In the granitic red soil hills region of South China, gully headcut erosion is considered one of the main processes in the development of gullies. However, the dynamics of run‐off hydraulic characteristics such as hydrodynamics and energy consumption during erosion have not been clarified. We investigated the effects of five headcut heights (25 to 125 cm) on hydrodynamic and energy consumption characteristics using field in situ water discharge scouring experiments. The results demonstrated that the flow velocity (V), Froude number (Fr), Reynolds number (Re), run‐off shear (τ) and run‐off power (ω) all indicate the upstream area (UA) > gully bed (GB). Except for V and Fr, several other hydraulic parameters exhibited a trend of sandy soil layer > red soil layer, and a fluctuating increase with increasing headcut height was observed in the GB. The jet velocity at the edge of the headcut (Vb), jet shear stress (τj), potential energy conversion (∆EP) and bottoming instantaneous kinetic energy (EKbottom) all increased exponentially with increasing headcut height by factors of 1.10 to 1.37, 1.16 to 2.00, 1.07 to 2.06 and 1.22 to 1.86, respectively. Except for ∆EP, all others performed a trend of sandy soil layer > red soil layer. The energy consumption at the gully head (∆EH) and its contribution tended to significantly increase with increasing headcut height, and the ∆EH of sandy soil layer was 13.20% to 49.89% higher than that of red soil layer. When the headcut height was greater than 100 cm, the contribution of energy consumption exceeded 50%. In addition, the sediment deposition process throughout the system was significantly influenced by the hydraulic and jet characteristics, and energy consumption was positively correlated with soil loss. The study results contribute to a profound understanding of gully headcut erosion and its hydrodynamic mechanisms.

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The effect of water content on the shear strength characteristics of granitic soils in South China

Cited by 70 publications

References 38 publications

Determining the Shear Strength and Permeability of Soils for Engineering of New Paddy Field Construction in a Hilly Mountainous Region of Southwestern China

Determining the Shear Strength and Permeability of Soils for Engineering of New Paddy Field Construction in a Hilly Mountainous Region of Southwestern China

Effect of weathering on short‐ and long‐term mechanical behaviour of granitic soils from the Benggang area under unloading conditions

Dynamics of run‐off hydraulic characteristics during gully headcut erosion driven by head height

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