Effects of High Shearing Rates on the Shear Behavior of Saturated Loess Using Ring Shear Tests

Ma, Jianquan; Zhao, Xiao-Ling; Li, Shibo; Duan, Zhao

doi:10.1155/2021/6527788

Cited by 6 publications

(2 citation statements)

References 37 publications

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“…38 For example, strain-rate dependency experiments on slip belt soils can be performed to obtain their residual strength, which can help to solve the deformation destabilization damage problem of landslides. 39 Ma et al 40 conducted drained tests on saturated loess at different strain rates using a ring shear apparatus and found that the shear strength of the specimen was greater at a lower strain rate. As the strain rate increased, the shear stress caused the soil particles to be crushed and the proportion of clay-grade particles to increase.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Hydrate-Bearing Clayey-Silty Sediments in the South China Sea: Strain-Rate Dependency

Li,

Hao,

et al. 2024

Energy Fuels

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Evaluating the mechanical behavior of hydratebearing sediment is a prerequisite and guarantee for achieving the safe exploitation and utilization of hydrates, and it is also important for the stability assessment of suction piles, anchor piles, and cable laying during the exploitation process. In this study, focusing on the strain-rate dependence of mechanical properties of methane hydrate-bearing clayey-silty sediments, 15 sets of drained triaxial shear tests with different strain rates and hydrate saturations were carried out, and X-ray computed tomography (CT) scans were performed on the specimens after deformation and dissociation. The results show that (1) all specimens exhibit characteristics of strain hardening and volumetric compression. With hydrate saturation increasing, the strain hardening phenomenon changes insignificantly, and the sensitivity of the hydrate-bearing sediment to strain rate increases due to the strong strain-rate dependency of the hydrate itself. The increased strain rate prevents small particles from adequately filling the pores, resulting in smaller volumetric compression; (2) as the strain rate increases, due to the coupled effect of hydrate cementation strengthening mechanism and decrease of local effective confining pressure, the shear strength decreases for hydrate-free sediments and increases for hydratebearing sediments; (3) when the hydrate saturation increases, the failure strength increases linearly, and the Secant Young's modulus E 50 increases nonlinearly. A nonlinear relationship formula between strain rate and E 50 is given; (4) similar to previous studies in clay mechanics, the strain-rate dependence of hydrate-bearing clayey-silty sediments tends to decrease or disappear at lower strain rates;(5) for converted strain-rate tests, the loading method with strain rates from low to high progressively can make the filling and interlocking between particles more sufficient, resulting in greater shear strength of the sediment.

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Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Hydrate-Bearing Clayey-Silty Sediments in the South China Sea: Strain-Rate Dependency

Li,

Hao,

et al. 2024

Energy Fuels

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“…Since landslides often occur at different velocities, the effect of shear rate on residual strength plays an important role in selecting appropriate parameters for designing the countermeasures. So far, the rate effect on the residual strength of various types of soil has been widely investigated (Tika et al, 1996;Skempton, 1985;Li and Aydin, 2013;Scaringi and Di Maio, 2016;Duong et al, 2018;Lian et al, 2018;Xu et al, 2018;Wang and Cong, 2019;Tiwari et al, 2020;Wang et al, 2020;Ma et al, 2021). Some investigations have shown that the rate dependency of residual strength of soil may depend on the mineralogical composition, soil density, normal stress, pore water chemistry, and Atterberg's limit.…”

Section: Introductionmentioning

confidence: 99%

Effect of pore water chemistry on the ring shear behavior and the rate dependency of residual strength

Nguyen,

Suzuki,

Nguyen

et al. 2023

JMES

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The rate dependency of residual strength plays an important role in the selection of residual strength parameters to design the remediation works for reactivated landslides. In the literature, it is shown that the rate dependency of residual strength depends on some factors such as types of soil, range of shear rates, range of effective normal stresses, and pore water chemistry. Recently, the effect of pore water chemistry on the rate dependency of residual strength soil has been examined. However, the ring shear behavior and the rate dependency of residual strength of soil having different pore fluids should be more evaluated. In this study, the effect of the pore fluids of distilled water and 1 M NaCl on the rate dependency of residual strength of kaolin clay was investigated in the Bishop ring shear apparatus. The ring shear tests were conducted at different shearing rates from 0.02 mm/min to 20 mm/min under the effective normal stress of 98 kPa. The research results showed that the pore fluid chemistry affected the shear displacement required to reach the peak strength, the vertical displacement, and the peak strength of kaolin clay. These parameters also exhibited rate dependency, especially at the fast shear rates. The research also indicated that the pore fluid chemistry had a significant effect on the rate dependency of residual strength. Accordingly, the rate dependency of residual strength of kaolin mixed with distilled water showed a positive tendency while that of kaolin with 1 M NaCl as the pore fluid was the neutral tendency.

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Experimental Study on Residual Shear Strength of Soil Using Undrained Ring Shear Apparatus

Amali,

Maduranga,

Weerasinghe

2024

Progress in Landslide Research and Technology

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In general, studies of residual shear strength are minimal for soils on landslide-prone slopes in Sri Lanka. This study focuses on determining the residual shear strength of the soil samples taken from the Athwelthota landslide area, by conducting a series of undrained monotonic shear-stress control ring shear tests. The shear behavior of soil under different effective normal stress conditions was observed and further, the shearing behavior of soil samples with different contents of silt and clay was analyzed. The results showed that a small cohesion was exhibited at low effective normal stress conditions and the mobilized friction angle became constant at higher normal stresses. It was also found that peak and steady-state shear strengths decreased when the fine content increased, resulting a higher brittleness index. And the brittleness index decreases with the increase of effective normal stress. Monitoring the pore water pressure during the shearing shows that it increased with shear displacement. A significant reduction in the shear strength could result from the shear failure due to the buildup of excess pore-water pressure within the shear zone. The specimen confined under identical stress conditions generated higher excess pore water pressure within the shear zone when the fine content was higher.

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Effects of High Shearing Rates on the Shear Behavior of Saturated Loess Using Ring Shear Tests

Cited by 6 publications

References 37 publications

Mechanical Behavior of Hydrate-Bearing Clayey-Silty Sediments in the South China Sea: Strain-Rate Dependency

Mechanical Behavior of Hydrate-Bearing Clayey-Silty Sediments in the South China Sea: Strain-Rate Dependency

Effect of pore water chemistry on the ring shear behavior and the rate dependency of residual strength

Experimental Study on Residual Shear Strength of Soil Using Undrained Ring Shear Apparatus

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