Statistical analysis on the relationship between shear strength and water saturation of cohesive soils

Gong, Wenping; Quan, Chuang; Li, Xinxin; Wang, Lei; Zhao, Chao

doi:10.1007/s10064-022-02811-y

Cited by 9 publications

(1 citation statement)

References 145 publications

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“…As the water content increases, physical softening and chemical erosion would become more severe. Gong et al [25] classified cohesive soil into three types: clay, silty clay, and silt. The statistical characteristics of the shear strength parameters in different water saturation regions were derived respectively.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of an Unstable Slope in Chongqing Based on Multiple Analysis Methods

Li¹,

Hu³

et al. 2023

Processes

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The failure of an unstable slope has the characteristics of sudden disaster, rapid sliding speed, and a wide range of influence. This study selected an unstable slope in Chongqing as the evaluation object, divided it into the strong-deformation zone and weak-deformation zone, and analyzed its formation mechanism and deformation failure mode. Macroscopic qualitative analysis was processed by the geological exploration method, the slope stability and the sliding thrust were quantitatively analyzed by the limit equilibrium method, and the sensitivity analysis was calculated and conducted on its shear strength parameters by laboratory tests and a field large shear test. The historical formation process of the slope was deduced, and suggestions for the prevention and control of unstable slopes were proposed. Studies show that the deformation mechanism of an unstable slope is a push type, its deformation is mainly concentrated in the southern area of the rear edge, and the width of the slope ground tensile crack is 1~30 cm, with a visible depth of 3~30 mm and an extension of 3~12 m. The shear strength of potential sliding zone soil in the weak-deformation zone is: cpw = 35.70 kPa, φpw = 14.80°, and in the strong-deformation zone it is: cps = 32.54 kPa, φps = 13.54°. The results show that the formation of a steep cliff by the artificial mining of sandstone is the main cause of slope deformation, the action of groundwater is the main triggering factor for slope deformation, and the inclined rock mass at the front edge is the key block for the deformation. The strong-deformation zone of the slope is in an unstable state under rainstorm, and the weak-deformation zone of the slope is basically-stable under rainstorm. Unstable slopes are prone to slide during a rainstorm period, which threatens the lives and properties of the residents and road traffic safety around the slope. The research results provide an important theoretical basis and data support for the accurate judgment and stability analysis of instability failure modes and for the further effective prevention and control of unstable slopes.

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Section: Introductionmentioning

confidence: 99%

Stability Analysis of an Unstable Slope in Chongqing Based on Multiple Analysis Methods

Li¹,

Hu³

et al. 2023

Processes

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Effect of Shallow Footing Resting on Variably Saturated Soil Slopes under Varying Rainfall Infiltration Conditions

Singh,

Mehndiratta

2024

Indian Geotech J

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Weakening of mechanical parameters of ion-absorbed rare-earth ores subjected to leaching

Wang,

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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Ion-adsorbed rare-earth ores are mined using in-situ leaching, and their mechanical properties significantly affect the efficient and safe recovery of rare earth elements. However, the mechanism of the change in the mechanical properties of the ore body due to the physicochemical processes caused by leaching remains unclear. To explore the strength evolution characteristics of the ore body during the leaching process, unconsolidated undrained triaxial tests were conducted to confirm how the stress–strain curve and shear strength of rare-earth samples change during leaching. Magnetic resonance imaging and T2 spectral characterizations were obtained by using nuclear magnetic resonance technology to measure the interior pore structure of samples during leaching. A scanning electron microscope equipped with an energy dispersive spectrometer was used to investigate the morphology evolution and the composition changes of the internal micro-area of the samples, to demonstrate the correlation between the microstructural change and the macroscopic mechanical properties. The results show that when a 2% ammonium sulfate solution is employed for mineral leaching, the effective leaching duration is 0–3 h. During this time, ion exchange occurs along the direction of solution seepage, resulting in the dispersion and migration of fine particles from the top to the bottom of the sample, which further triggers a change in the sample's pore structure and pore size. In addition, the local loss of fine particles resulted in a reduced bond strength between minerals, forming an unstable soil structure with a loose upper part and a dense lower part, which is macroscopically expressed as a declining shear strength parameter of the rare-earth sample. Graphical abstract

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Statistical analysis on the relationship between shear strength and water saturation of cohesive soils

Cited by 9 publications

References 145 publications

Stability Analysis of an Unstable Slope in Chongqing Based on Multiple Analysis Methods

Stability Analysis of an Unstable Slope in Chongqing Based on Multiple Analysis Methods

Effect of Shallow Footing Resting on Variably Saturated Soil Slopes under Varying Rainfall Infiltration Conditions

Weakening of mechanical parameters of ion-absorbed rare-earth ores subjected to leaching

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