Factors affecting pre-failure instability of sand under plane-strain conditions

Wanatowski, Dariusz; Chu, Jian

doi:10.1680/geot.9.p.111

Cited by 26 publications

(5 citation statements)

References 55 publications

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“…In this paper, the yield function proposed for an anisotropic material in plane-strain conditions by Booker and Davis (1972) is used to derive the yield function for two cases of a cracked geomaterial: (1) with isotropic matrix, and (2) with anisotropic matrix. Plane-strain conditions are very common in most geotechnical problems (Wanatowski et al 2010, Wanatowski andChu 2012;Chu et al 2015, Yuan et al 2018. Thus, the yield function proposed by Booker and Davis (1972) can be suitably adapted for the use in geotechnical practice (e.g.…”

Section: Yield Criteria Of Glaciotectonically Deformed Soilsmentioning

confidence: 99%

Yield criteria for glaciotectonically deformed deposits

Florkiewicz

Wanatowski

Flieger-Szymańska

et al. 2018

Engineering Geology

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Most glaciotectonically deformed deposits, including varved clays and glacial tills, are characterised by cracks and fissures. This paper presents a method for describing the yield criteria for glacitectonically deformed cohesive deposits using a model of cracked geomaterial with isotropic or anisotropic matrix. The general representation of the limit conditions for anisotropic materials in plane-strain is used to determine the yield criterion. The yield criterion represents a convex, piece-wise surface in the three-dimensional stress space revealing explicitly global, plastic properties of the materials considered. An example of using proposed yield criteria to solve a bearing capacity problem of a strip foundation constructed on a glaciotectonically cracked layer is presented. The lower and upper-bound estimates of limit loads on the strip footing are given. The limit state analysis presented in this paper can be used to solve many other geotechnical engineering problems, for example, the stability of slopes and reinforced walls or the bearing capacity of pile foundations.

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Section: Yield Criteria Of Glaciotectonically Deformed Soilsmentioning

confidence: 99%

Yield criteria for glaciotectonically deformed deposits

Florkiewicz

Wanatowski

Flieger-Szymańska

et al. 2018

Engineering Geology

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“…More detail on the soil tested, the plane-strain apparatus and the testing procedure is given by Wanatowski & Chu (2006, 2007, 2012. The results of two plane-strain tests are shown in Fig.…”

Section: Problems With Measurement Of Post-liquefaction Strengthmentioning

confidence: 99%

Difficulties in the determination of post-liquefaction strength for sand

Chu

Wanatowski

2014

Géotechnique Letters

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Article:Chu, J and Wanatowski, D orcid.org/0000-0002-5809-0374 (2014) Difficulties in the determination of post-liquefaction strength for sand. Géotechnique Letters, 4 (1). pp. 57-61.https://doi.org/10.1680/geolett.13.00076 eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.Difficulties in the determination of post-liquefaction strength for sand J. CHU* and D. WANATOWSKI{ Static liquefaction has been considered one of the commonest failure mechanisms for granular soil slopes or tailings dams. One of the design approaches adopted is based on the so-called postliquefaction strength as a design parameter. However, determination of the post-liquefaction strength by laboratory tests is problematic. In this paper, experimental data are used to illustrate that the postliquefaction strength cannot be determined properly or uniquely in the laboratory. The assumption of an undrained condition is also questionable for sand or tailings with relatively high permeability under static loading conditions. Due to the above deficiencies, it is recommended that engineers stop using the post-liquefaction strength as a design parameter in practice.

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“…These make static liquefaction to be one of the most catastrophic mechanisms of under-water slope failures. Instability of these slopes can be triggered by static loads, such as sediments deposition, toe erosion, rising of an embankment height, scours near a structure or dredging activities (Kvalstad et al 2001;Wanatowski and Chu 2012;Sadrekarimi 2016; De Jager 2017; Maghsoudloo 2017). Several cases of static liquefaction of submarine slopes and flow slides have been reported in the literature (Andresen and Bjerrum 1967;Bjerrum 1971;Sladen et al 1985b;Kramer 1988;Kraft Jr et al 1992).…”

Section: Introductionmentioning

confidence: 99%

Centrifuge modelling of submarine landslides due to static liquefaction

Zhang¹,

Askarinejad²

2019

Landslides

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Sand erosion and scouring caused by waves and marine currents result in gradual increase of local seabed inclination and formation of slopes around hydraulic structures and offshore foundations. During this process, shear stresses in the soil body increase monotonically which may lead to static liquefaction and damage of the adjacent offshore infrastructure. This paper presents the details of a newly developed static liquefaction triggering actuator to be used at an enhanced gravity condition in a geotechnical centrifuge. This actuator simulates the steeping process of submarine sand layers due to scouring and enables the investigation of failure mechanisms in submerged slopes. The details of the centrifuge test setup designed and constructed to simulate the process of triggering static liquefaction in loose sand layers are presented. Furthermore, the performance of the novel integrated model preparation facility using sand fluidization is explained. The setup was used to conduct several centrifuge tests at four different slope steepening rates to investigate the slope steepening rate effects. Moreover, the effect of viscosity of the submerging pore fluid on the behaviour of the slopes at the onset of failure is investigated. The Coriolis effect on loose saturated sand samples during increase of g-level is examined as well. Results show that the built-up of pore pressure due to local shear deformations can be detected and considered as one of the triggering mechanisms of this kind of submarine slope instabilities.

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Factors affecting pre-failure instability of sand under plane-strain conditions

Cited by 26 publications

References 55 publications

Yield criteria for glaciotectonically deformed deposits

Yield criteria for glaciotectonically deformed deposits

Difficulties in the determination of post-liquefaction strength for sand

Centrifuge modelling of submarine landslides due to static liquefaction

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