Strength recovery from residual state in reactivated landslides

Gibo, Seiichi; Egashira, K.; Ohtsubo, Masami; Nakamura, Shuichi

doi:10.1680/geot.2002.52.9.683

Cited by 50 publications

(15 citation statements)

References 5 publications

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“…It is seen from thisˆgure that (t/sN, 2nd)r, that is, the residual stress ratio during reshearing is almost constant, irrespective of preshearing. This result is consistent with the recovery characteristic of residual strength due to reconsolidation before reshearing (Gibo et al, 2002). Accordingly, the residual strength is independent of any stress history in the consolidation and shear processes.…”

Section: In‰uence Of Stress History In Consolidation and Shear Processessupporting

confidence: 88%

Residual Strength Characteristics of Naturally and Artificially Cemented Clays in Reversal Direct Box Shear Test

Suzuki

Tsuzuki²,

Yamamoto

2007

Soils and Foundations

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Section: In‰uence Of Stress History In Consolidation and Shear Processessupporting

confidence: 88%

Residual Strength Characteristics of Naturally and Artificially Cemented Clays in Reversal Direct Box Shear Test

Suzuki

Tsuzuki²,

Yamamoto

2007

Soils and Foundations

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“…A ring-shear test apparatus is commonly used in investigations of shear strength in the slip surfaces of landslides and fault zones because it can shear a specimen with a unidirectional rotational movement for unlimited relative displacement [10,16,18,19,[21][22][23][24][28][29][30][31][32][33][34][35][36][37][38]. The ring-shear apparatus used in this study was improved at the National Institute of Advanced Industrial Science and Technology (AIST) in Japan.…”

Section: Ring-shear Apparatus and Permeability Measurementsmentioning

confidence: 99%

Investigation of Fault Permeability in Sands with Different Mineral Compositions (Evaluation of Gas Hydrate Reservoir)

et al. 2015

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Abstract:We used a ring-shear apparatus to examine the perpendicular permeability of sands with different mineral compositions to evaluate fault behavior around gas hydrate reservoirs. The effect of effective normal stress on the permeability of two sand types was investigated under constant effective normal stresses of 0.5-8.0 MPa. Although Toyoura sand and silica sand No. 7 mainly comprise quartz, silica sand No. 7 contains small amounts of feldspar. For Toyoura sand, the permeability after ring-shearing dramatically decreased with increasing effective normal stress up to 3.0 MPa, then gradually decreased for stresses over 3.0 MPa, whereas the permeability after ring-shearing of silica sand No. 7 rapidly decreased with increasing effective normal stress up to 2.0 MPa. Although the relationships between the permeability after ring-shearing and effective normal stress for both sands could be expressed by exponential equations up to 3.0 MPa, a more gradual change in slope was shown for Toyoura sand. The permeabilities of both sands were almost equal for effective normal stresses over 3.0 MPa. The mineralogical properties of the small amount of feldspar in the sample indicate that both mineralogy and original grain size distribution affect the fault permeability and shear zone formation. OPEN ACCESSEnergies 2015, 8 7203

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“…Finally, the slight difference interpreted by Angeli et al (1996Angeli et al ( , 2004 between the shearing resistance that was overcome to reactivate slope movement, and shearing resistance that was mobilized to stop movement, may be attributed to displacement self-stabilization where geometry allows (Salt 1988;Skempton et al 1989). Gibo et al (2002) examined strength recovery from residual condition in reactivated landslides using a new ring shear apparatus with shear surface within soil at the gap between the upper and lower confining rings. Remolded samples from the Kamenose landslide (w ℓ ¼ 114%, I p ¼ 64%, CF ¼ 73%; 77% smectite-Ca and Mg montmorillonite, 14% quartz), and Xuechengzhen landslide (w ℓ ¼ 32%, I p ¼ 14%, CF ¼ 10%; 25% chlorite, 30% mica, 33% quartz, 11% feldspars) were used in the ring shear tests.…”

Section: Literature On Aging Of Residual Conditionmentioning

confidence: 99%

Residual Shear Strength Measured by Laboratory Tests and Mobilized in Landslides

Mesri

Huvaj

2012

J. Geotech. Geoenviron. Eng.

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Drained residual shear strength measured by multiple reversal direct shear or ring shear tests has been successfully used for over four decades for stability analyses of reactivated landslides in stiff clays and clay shales; A body of literature has accumulated in recent decades, claiming that "healing" or "strength regain" is realized in time on preexisting slip surfaces already at residual condition. In other words, the shear stress required to reactivate a landslide is claimed to be larger than the drained residual shear strength determined using laboratory tests. This article presents (1) a comparison of secant residual friction angle determined from laboratory tests and secant mobilized friction angle back-calculated for reactivated landslides; (2) explanations that field evidence used to claim "healing" can be attributed to alternative factors, and the laboratory evidence on "strength regain" upon reshearing is the result of either the testing apparatus or testing procedure, or is inapplicable to stiff clays and shales; and (3) laboratory aging test results, which show no "strength regain" on preexisting shear surfaces at residual condition.

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Strength recovery from residual state in reactivated landslides

Cited by 50 publications

References 5 publications

Residual Strength Characteristics of Naturally and Artificially Cemented Clays in Reversal Direct Box Shear Test

Residual Strength Characteristics of Naturally and Artificially Cemented Clays in Reversal Direct Box Shear Test

Investigation of Fault Permeability in Sands with Different Mineral Compositions (Evaluation of Gas Hydrate Reservoir)

Residual Shear Strength Measured by Laboratory Tests and Mobilized in Landslides

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