Residual Strength of Weakly Cemented Kaolin Clay in Multi-stage Ring Shear Test

Duong, Nguyen Thanh; Hai, Nguyen Van

doi:10.1007/s13369-021-06132-2

Cited by 8 publications

(6 citation statements)

References 36 publications

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“…Additionally, the brittleness index tends to decrease as the shear displacement rate increases, especially at shear rates above 2 mm/min. For lightly cemented clay, Duong and Hai (2021b) also reported that the brittleness index decreased with the increase in shear rates. The decrease of IB with increasing shear rates in this study indicates that the slope of kaolin clay may cause flow slide at the slow shear rates.…”

Section: Effect Of Pore Fluids On the Ring Shear Behaviormentioning

confidence: 86%

“…The slurry was then poured and pre-consolidated in a large consolidation tank at the effective normal stress of 98 kPa until finishing the primary consolidation which was based on the 3t method (JGS 0560-2009). The pre-consolidation procedure to create samples used in ring shear tests has been presented in some previous studies (Duong et al, 2018;Duong and Hai, 2021a;Suzuki, 2020, 2022). After pre-consolidation, the pre-consolidated samples were cut and trimmed to produce the ring-shaped specimen with an inner diameter of 6 cm, an outer diameter of 10 cm, and a height of 2 cm.…”

Section: Sample Preparation and Methodsmentioning

confidence: 99%

“…The common Bishop-type ring shear apparatus was employed in this study (Figure 1). The detail of this apparatus has been reported in some previous studies (Suzuki et al, 2017;Duong et al, 2018;Duong and Hai, 2021a;Suzuki, 2020, 2022). This apparatus uses a ringshaped specimen with 6 cm of inner diameter, 10 cm of outer diameter, and 2 cm of height.…”

Section: Apparatusmentioning

confidence: 98%

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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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Section: Effect Of Pore Fluids On the Ring Shear Behaviormentioning

confidence: 86%

Section: Sample Preparation and Methodsmentioning

confidence: 99%

Section: Apparatusmentioning

confidence: 98%

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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 dry powder kaolin clay was mixed with distilled water into a slurry at about twice its liquid limit. The slurry was then poured into a large consolidation tank with an inner diameter of 15cm, a height of 30 cm [9,29,30] and vacuum pressure of 70 kPa was applied for at least 1 hour to release air bubbles The slurry samples were pre-consolidated at a normal stress of 98 kPa in the consolidation tank until the primary consolidation was completed. The primary consolidation time was determined based on the 3t method [31].…”

Section: Material Sample Preparation and Test Apparatusmentioning

confidence: 99%

“…In this apparatus, the shear force, shear displacement, vertical displacement, and frictional force between the inner circumference of the shear box and the specimen were automatically recorded during shearing. The details of this apparatus have been reported in previous studies [9,30,[32][33][34].…”

Section: Material Sample Preparation and Test Apparatusmentioning

confidence: 99%

Rate Effects on Peak and Residual Strengths of Overconsolidated Clay in Ring Shear Tests

Duong

Suzuki

2021

Period. Polytech. Civil Eng.

Self Cite

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Overconsolidated (OC) clay soil is widely distributed in landslide slopes. This soil is often fissured, jointed, contains slickensides, and is prone to sliding. Thus, the shear strength behavior of OC clayey soil is complicated and has received much attention in the literature and in practice in terms of evaluating and predicting landslide stability. However, the behavior of the shear strength of OC clayey soil at different shear rates, as seen in ring shear tests, is still only understood to a limited extent and should be examined further, especially in terms of the residual strength characteristics. In this study, a number of ring shear tests were conducted on kaolin clay at overconsolidation ratios (OCRs) ranging from 1 to 6 under different shear displacement rates in the wide range of 0.02 mm/min to 20.0 mm/min to investigate the shear behavior and rate dependency of the shear strength of OC clay. Variations in the cohesion and friction angles of OC clay under different shear rates were also examined. The results indicated that the rate effects on the peak strength of OC and normally consolidated (NC) clays are opposite at fast shear displacement rates. At the residual state, as with NC clay, the positive rate effect on the residual strength is also exhibited in OC clay, but at a lower magnitude. Regarding the shear strength parameters, the variations in the cohesion and friction angles of OC clay at different shear rates were found to be different at peak and residual states.

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Investigating the Shear Strength Characteristics of Slip Zone Soil Based on In-situ Multiple Shear Tests

Li¹,

Li²,

Han³

et al. 2023

KSCE J Civ Eng

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Residual Strength of Weakly Cemented Kaolin Clay in Multi-stage Ring Shear Test

Cited by 8 publications

References 36 publications

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

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

Rate Effects on Peak and Residual Strengths of Overconsolidated Clay in Ring Shear Tests

Investigating the Shear Strength Characteristics of Slip Zone Soil Based on In-situ Multiple Shear Tests

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