Undrained Cyclic Shear Strength and Residual Shear Strain of Saturated Sand by Cyclic Triaxial Tests

Hyodo, Masayuki; Murata, Hidekazu; Yasufuku, Noriyuki; Fujii, Teruhisa

doi:10.3208/sandf1972.31.3_60

Cited by 95 publications

(14 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been widely documented in the literature that sands, when sheared in an undrained state, may liquefy under both monotonic and cyclic loading conditions [1][2][3][4][5][6]. The mechanism triggering flow failure has been carefully considered by geotechnical researchers over the past decades.…”

Section: Introductionmentioning

confidence: 99%

DEM analysis of the onset of flow deformation of sands: linking monotonic and cyclic undrained behaviours

et al. 2018

View full text Add to dashboard Cite

Z 2018, 'DEM analysis of the onset of flow deformation of sands: linking monotonic and cyclic undrained behaviours', Acta geotechnica. https://doi. AbstractThis study explores the link between the monotonic and cyclic undrained behaviour of sands using the discrete element method (DEM). It is shown that DEM can effectively capture the flow deformation of sands sheared under both monotonic and cyclic undrained loading conditions. When subjected to cyclic shearing, flow-type failure is observed for a loose sample, while cyclic mobility is observed for a dense sample. A strong correlation between the monotonic and cyclic loading behaviour that has been revealed experimentally is also confirmed in DEM simulations: a) flow deformation occurs in the compressive loading direction when the cyclic stress path intersects the monotonic compression stress path prior to the monotonic extension stress path, and vice versa; b) the onset of flow deformation in q-p' space is located in the zone bounded by the critical state line and the instability line determined from monotonic simulations. Hill's condition of instability is shown to be effective to describe the onset of flow failure. Micro-mechanical analyses reveal that flow deformation is initiated when the index of redundancy excluding floating particles drops to below 1.0 under both monotonic and cyclic loading conditions. Flow deformation induced by either monotonic or cyclic loading is characterized by abrupt change of structural fabric which is highly anisotropic. The reason why the dense sample * Corresponding author: Email: xhuang@tongji.edu.cn; Phone: +86 (0)21 6598 4551; Fax: +86 (0)21 6598 4551 2 dilated during monotonic loading but showed cyclic mobility (temporary liquefaction) during cyclic loading is attributed to the repeating reversal of loading direction, which leads to the periodic change of microstructure.

show abstract

Section: Introductionmentioning

confidence: 99%

DEM analysis of the onset of flow deformation of sands: linking monotonic and cyclic undrained behaviours

et al. 2018

View full text Add to dashboard Cite

show abstract

“…τmax > 0 and τmin > 0). Consequently, non-reversal stress or one-way loading takes place (Yoshimi and Oh-oka, 1975;Hyodo et al, 1991; among others).…”

Section: Stress Conditions In Sloped Ground During Earthquakesmentioning

confidence: 99%

“…The role of initial static shear on the undrained cyclic behavior of sandy soils has been long investigated by means of well-controlled laboratory testing, namely conventional triaxial apparatus (Lee et al, 1967;Vaid et al, 1983, Hyodo et al, 1991; Yang and Sze, 2011; among others), or using simple shear devices, which can simulate field stress conditions expected during earthquakes more accurately than triaxial apparatus (Yoshimi et al, 1975;Vaid et al, 1979;Tatsuoka et al, 1982;Chiaro et al, 2012 and2013). The major conclusion from these studies is that the initial static shear stress has a significant effect on the liquefaction resistance of sandy soils, in conjunction with the earthquake-induced cyclic shear stress, the soil relative density, confining pressure, among other factors.…”

Section: Introductionmentioning

confidence: 99%

On the influence of initial static shear on large deformation behavior of very loose Toyoura sand in undrained cyclic torsional shear tests

Umar

Chiaro

Kamiya

2016

JGS Special Publication

View full text Add to dashboard Cite

This paper reports on the influence of initial static shear on large deformation behavior of very loose (Dr = 24-30%) Toyoura sand subjected to undrained cyclic torsional loading. A series of isotropically consolidated torsional simple shear tests were carried out on hollow cylindrical specimens up to single amplitude shear strain exceeding 50%. Two types of cyclic loading patterns, namely reversal stress and non-reversal stress, were employed by varying the magnitude of combined initial static shear and cyclic shear stresses. The observed types of failure were distinguished as liquefaction and residual deformation based on the difference in the effective stress paths and the modes of development of cyclic residual shear strain. Test results revealed that, similar to the case of medium-dense Toyoura sand (Dr = 44-50%) previously investigated by the Authors, under reversal stress loading, failure could be associated with liquefaction followed by extremely large deformation during cyclic mobility. Contrarily, under non-reversal stress loading, a progressive accumulation of residual deformation brought specimens to failure although liquefaction did not occur. Moreover, the presence of initial static shear does not always lead to a decrease in the liquefaction resistance or strain accumulation of very loose sand. In fact, its resistance can increase or decrease with an increase in initial static shear stress, but it strongly depends on the combination of static and cyclic shear stresses and, thus, on the type of loading. However, under the same magnitude of combined shear stresses applied, very loose sand is much weaker against large cyclic shear strain accumulation than the medium-dense sand.

show abstract

“…Liquefaction in sand has caused significant damage to infrastructure in earthquakes, including road damage, ground subsidence, collapse of houses, et al Previous studies indicate that liquefaction is more likely to occur in saturated sand than unsaturated sand (Ishihara et al, 2001; Okamura and Soga, 2006). Great efforts have been made on liquefaction in saturated sand by performing laboratory tests (Ishihara et al, 1975;Hyodo et al, 1991). However, it is still one of the hot topics in geotechnical engineering and earthquake engineering due to the complex mechanism before and after liquefaction.…”

Section: Introductionmentioning

confidence: 99%

“…To date, various researches employed dynamic triaxial tests to study the liquefaction in saturated sand (Seed and Lee, 1966;Ishihara et al, 1975;Hyodo et al, 1991). However, the underground soil is in shear state under seismic load, which is similar to the loading process in a simple shear test.…”

Section: Introductionmentioning

confidence: 99%

DEM analysis of undrained cyclic simple shear test on saturated sand

Jiang

Shen

Sun

2020

JGS Special Publication

View full text Add to dashboard Cite

Liquefaction can be considered to occur in saturated sand widely under seismic load, which will cause serious disaster, including road damage, ground subsidence, cracking of houses. Thus, it is quite necessary to study the liquefaction characteristics of saturated sand. For this aim, the undrained simple shear test on saturated sand under cyclic loading were simulated by three-dimensional distinct element method (DEM), where the stress-strain relationship, excess pore pressure ratio, mechanical coordination number and contact normal direction were analyzed. The results show that the liquefaction of saturated sand is manifested by the accumulation of excess pore pressure ratio. In addition, the mechanical coordination number gradually reduces and the sample anisotropy slightly fluctuates before the saturated sand reaches initial liquefaction. When the specimen approaches initial liquefaction, the mechanical coordination number drops abruptly and the sample anisotropy obviously increases.

show abstract

Undrained Cyclic Shear Strength and Residual Shear Strain of Saturated Sand by Cyclic Triaxial Tests

Cited by 95 publications

References 4 publications

DEM analysis of the onset of flow deformation of sands: linking monotonic and cyclic undrained behaviours

DEM analysis of the onset of flow deformation of sands: linking monotonic and cyclic undrained behaviours

On the influence of initial static shear on large deformation behavior of very loose Toyoura sand in undrained cyclic torsional shear tests

DEM analysis of undrained cyclic simple shear test on saturated sand

Contact Info

Product

Resources

About