Undrained Deformation and Liquefaction of Sand Under Cyclic Stresses

Ishihara, Kenji; Tatsuoka, Fumio; Yasuda, Susumu

doi:10.3208/sandf1972.15.29

Cited by 652 publications

(194 citation statements)

References 4 publications

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“…Cyclic loading significantly affects the behaviour of soil and foundations and has been the subject of intense research since the early studies in the late 1960s by, for example, Seed & Lee (1966), Seed (1968), Ishihara et al (1975) and Andersen (1976). The importance to foundation engineering problems is also well documented (e.g.…”

Section: Clay Subjected To Cyclic Loadingmentioning

confidence: 99%

A numerical study of capacity and stiffness of circular skirted foundations in clay subjected to combined static and cyclic general loading

2018

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Skirted foundations have been widely applied as offshore foundations for several decades. In design, the use of failure envelopes is convenient for assessing stability under combined loading. A large number of studies on failure envelopes exist in the literature based on experiments and numerical analyses. Most of these studies focus on ultimate capacity and static loading. This paper presents a numerical study focusing on cyclic degradation and failure envelopes for skirted foundations subjected to combined cyclic and static loading. It was found that the shapes of the failure envelopes are little affected by degradation expressed by the number of equivalent cycles. In addition to failure envelopes, contours of displacements were computed in the three-dimensional load space (vertical, horizontal and moment load) for a more complete description of the response. As an example, the well-defined cyclic contour diagrams of Drammen clay were utilised to demonstrate how foundation response diagrams can be established. The database is accompanied by a simplified procedure to account for cyclic degradation through equivalent number of cycles, different normalised load-displacement response and variation in foundation geometry. The framework of procedures can be used to estimate foundation stiffness and capacity and the results can serve as a basis for the development of foundation macro-element models.

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Section: Clay Subjected To Cyclic Loadingmentioning

confidence: 99%

A numerical study of capacity and stiffness of circular skirted foundations in clay subjected to combined static and cyclic general loading

2018

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“…Alternatively, (τ/p') = C d corresponds to zero dilatancy state (i.e. phase transformation state [20]). [5] reported that, for a given material, the mobilized angle of shear resistance at zero dilatancy, φ' PTL = tan -1 (τ/p') PTL , is independent of stress level and density.…”

Section: Stress-dilatancy Relations Of Sand Under Torsional Shearmentioning

confidence: 99%

An Elasto-plastic Model for Liquefiable Sands Subjected to Torsional Shear Loadings

Chiaro

Koseki

2013

Springer Series in Geomechanics and Geoengineering

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“…As shown in Figure 3(a), KM20 exhibited strain softening at s Figure 3(a), or for better clarity Figures 6 and 7, the behaviours of strain softening and strain hardening are very obvious. Ishihara et al (1975) defined the phase transformation point as the point at which the stress path turns its direction in p 0 -q space.…”

Section: Ciu Testsmentioning

confidence: 99%

Behaviour of MH silts with varying plasticity indices

Wong

Ong

Robinson

2017

Geotechnical Research

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It is important for geotechnical engineers to understand the intrinsic and mechanical behaviour of silt as it is presently recognised that there exist gaps in understanding its fundamental behaviour. The behaviour of kaolin samples with varying clay and silt contents was investigated in the present study. This study characterised the samples by their corresponding ranges of plasticity index (P I ) -namely, P I £ 13% and P I > 13%. This outcome is achieved by interpreting the results of Atterberg limit tests, particle size analysis, isotropically consolidated undrained triaxial tests and oedometer tests carried out on the kaolin samples with P I between 7 and 16%. The results obtained in this study show good reliability when compared to 65 sets of past significant experimental studies derived from 33 established past research papers.

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Undrained Deformation and Liquefaction of Sand Under Cyclic Stresses

Cited by 652 publications

References 4 publications

A numerical study of capacity and stiffness of circular skirted foundations in clay subjected to combined static and cyclic general loading

A numerical study of capacity and stiffness of circular skirted foundations in clay subjected to combined static and cyclic general loading

An Elasto-plastic Model for Liquefiable Sands Subjected to Torsional Shear Loadings

Behaviour of MH silts with varying plasticity indices

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