Statistical variability of ring shear test results on a shear zone in London Clay

Bromhead, E. N.; Harris, Andrew; Ibsen, Maïa-Laura

doi:10.1201/9780203739600-83

Cited by 3 publications

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“…In the representative samples from each site, ring shear tests were also conducted according to ASTM D6467-21 [40] to determine the finer material's residual angle of friction. For this purpose, the ring shear apparatus developed by Bromhead (1979Bromhead ( , 1986 [41,42] was used by applying four different normal stresses σ n (50, 100, 200, and 400 kPa). The apparatus allowed testing of ring-shaped test specimens having an outer and inner diameter of 100 mm and 70 mm, respectively a thickness of 5 mm.…”

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Large Shear Strength Parameters for Landslide Analyses on Highly Weathered Flysch

Anagnostopoulou

Depountis

Sabatakakis

et al. 2022

Land

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Many significant landslide movements are often observed in the upper weathering zone of flysch, which constitutes the most critical landslide-prone geological formation in Western Greece. In this article, a laboratory approach is adopted to investigate the behavior of highly weathered and tectonically decomposed flysch for slope stability analyses with the performance of large shear testing in reconstituted soil specimens. The testing program included several reconstituted flysch specimens derived from three representative landslides. Tests under large direct shearing (300 × 300 × 120 mm) were conducted in moisture- and density-controlled conditions and ring shear tests were conducted in the finer material. The test results revealed that the values of the effective angle of friction in the flysch material decrease with the increasing water content. Moreover, dense specimens showed curved failure envelopes due to dilatancy, especially in dry conditions. A comparison of laboratory test results with those obtained by performing back-analyses under saturated conditions has shown that the sliding of the weathered and decomposed flysch mainly depends on its residual angle of friction which was found to be 1°–6° lower than the ultimate angle of friction as it was estimated by the large shear tests.

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confidence: 99%

Large Shear Strength Parameters for Landslide Analyses on Highly Weathered Flysch

Anagnostopoulou

Depountis

Sabatakakis

et al. 2022

Land

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Recent Developments in the Evaluation and Application of Residual and Fully Softened Shear Strengths for the Stability Analyses of Landslides

Tiwari

Ajmera

2020

Understanding and Reducing Landslide Disaster Risk

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Measuring “Fast” Shear Strengths Along Slickensided Surfaces in the Bromhead Ring Shear

Meehan

Brandon

Duncan

2008

Geotechnical Testing Journal

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Fast and slow ring shear tests were performed in the Bromhead ring shear device to examine the effect of the displacement rate on the shear strength measured along slickensided discontinuities in Rancho Solano Fat Clay. For each test, initial drained shearing was performed at a displacement rate of 0.018 mm/min, fast shearing was performed at a rate of 44.5 mm/min, and drained shearing was recommenced at a displacement rate of 0.018 mm/min. Significant variations in measured post-peak shear strengths were observed, and problems with the pore pressure response in the soil surrounding the slickensided plane are discussed. As a result of these problems, it was concluded that fast Bromhead ring shear tests may not be suitable for evaluating the effects of fast shearing on the strengths of slickensided surfaces.

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Statistical variability of ring shear test results on a shear zone in London Clay

Cited by 3 publications

References 0 publications

Large Shear Strength Parameters for Landslide Analyses on Highly Weathered Flysch

Large Shear Strength Parameters for Landslide Analyses on Highly Weathered Flysch

Recent Developments in the Evaluation and Application of Residual and Fully Softened Shear Strengths for the Stability Analyses of Landslides

Measuring “Fast” Shear Strengths Along Slickensided Surfaces in the Bromhead Ring Shear

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