Undrained Cyclic Behavior of Reconstituted Natural Pumiceous Sands

Asadi, Mohammad; Asadi, Mohammad Bagher; Orense, Rolando P.; Pender, Michael

doi:10.1061/(asce)gt.1943-5606.0001912

Cited by 30 publications

(3 citation statements)

References 28 publications

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“…This kind of cyclic failure mode of sand has been reported extensively in the literature (e.g. Asadi et al 2018;Ishihara 1993;Koseki et al 2005). For rooted specimens, irrespective of RVRs, cyclic mobility was the prevailing failure mechanism (Figs 5(b), (c) and (d)).…”

Section: Cyclic Behavioursupporting

confidence: 62%

Monotonic and cyclic behaviour of root-reinforced sand

et al. 2021

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Plant roots are known to provide mechanical reinforcement to soils upon shearing and seismic loading. However, the effects of different stress paths on root reinforce-ment are unclear. Moreover, whether, and how, roots provide resistance to soil lique-faction upon cyclic loading have rarely been studied. The objective of this study is to conduct a series of undrained triaxial tests to investigate the monotonic and cyclic behaviour of rooted sand. Roots of vetiver grass (Chrysopogon zizanioides L), which has been advocated for use in shallow slope stabilisation purposes, were used for testing. The root diameters ranged between 0.3 to 1.5 mm, while the root volume ra-tios were 0.23%, 0.45% and 0.67%. It was discovered that the root reinforcement ef-fect was anisotropic and path-dependent. Along the extension path when the major principal stress was perpendicular to the predominant root orientation, the root-induced increase in soil friction angle was approximately 10o. This increase was much greater than the case along the compression path where the change was min-imal. The presence of roots prevented the limited flow failure (which occurred in the unreinforced sand), and the failure mode of root-reinforced soil switched to cyclic mobility. The liquefaction resistance was improved with an increase in root volume, and this improvement was more remarkable at higher cyclic stress ratios.

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Section: Cyclic Behavioursupporting

confidence: 62%

Monotonic and cyclic behaviour of root-reinforced sand

et al. 2021

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“…8a highlights the data points of the axial strain between À1.5% and 1.5%. limited deformation can be categorised as cyclic mobility with limited flow (Sze and Yang, 2014;Asadi et al 2018).…”

Section: Effect Of Csr and Inherent Anisotropymentioning

confidence: 99%

Linking inherent anisotropy with liquefaction phenomena of granular materials by means of DEM analysis

Otsubo

Chitravel

Kuwano

et al. 2022

Soils and Foundations

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“…Previous researches at the University of Auckland have examined the engineering properties of pumice sands in the laboratory (e.g. Marks et al, 1998;Wesley et al, 1999;Wesley, 2001;Pender, 2006;Pender et al, 2006;Kikkawa et al, 2009;2011;Orense et al 2012;2014;Asadi et al 2018). Some of the results obtained are discussed below.…”

Section: Previous Laboratory Studiesmentioning

confidence: 99%

Field characterisation and mapping of pumiceous deposits in central North Island, NZ

Gill¹,

Orense

2019

JGS Special Publication

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Pumice materials are frequently encountered in many engineering projects in the central part of the North Island, New Zealand. Because of their lightweight, highly crushable and compressible nature, existing empirical correlations developed for hard-grained (quartz) sands are not applicable, and therefore they are problematic from an engineering and construction viewpoint. With engineering developments currently on-going in the region, a better understanding of the characteristics and locations of these pumiceous layers has become necessary. This paper attempts to identify the field characteristics of pumice deposits based on conventional geotechnical methods for the purpose of mapping the locations of pumiceous layers across the Bay of Plenty and Waikato regions. For this purpose, existing geotechnical data within the target regions, including standard penetration tests (SPT), cone penetration tests (CPT), seismic dilatometers (sDMT), machine boreholes and associated laboratory testing, are compiled. In addition, pumice deposits are identified within the existing data as well as the extent of the stratigraphic unit(s) and typical trends within the data set and correlations across various test types are analysed. It is envisioned that the outputs presented in the paper will be beneficial to researchers, practising geotechnical engineers, roading authorities and council planners in terms of providing better engineering understanding of these problematic soils.

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Undrained Cyclic Behavior of Reconstituted Natural Pumiceous Sands

Cited by 30 publications

References 28 publications

Monotonic and cyclic behaviour of root-reinforced sand

Monotonic and cyclic behaviour of root-reinforced sand

Linking inherent anisotropy with liquefaction phenomena of granular materials by means of DEM analysis

Field characterisation and mapping of pumiceous deposits in central North Island, NZ

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