Sand grain crushing and interface shearing during displacement pile installation in sand

Yang, Z. X.; Jardine, Richard J.; Zhu, Bitang; Foray, Pierre; Tsuha, Cristina de Hollanda Cavalcanti

doi:10.1680/geot.2010.60.6.469

Cited by 179 publications

(133 citation statements)

References 19 publications

(39 reference statements)

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“…Radial stress maxima exceeding 15% qc were observed at h/R∼0·5, r/R = 2, during penetration, while the 'zeroload' stationary values were two to three times smaller. Yang et al (2010) The above effective stress profiles, taken in combination with the time-dependent behaviour discussed above ('Investigating timedependent behaviour'), have the potential to explain the marked field capacity-time trends illustrated in Figure 1 by the Dunkerque tension pile loading tests.…”

Section: Investigating Time-dependent Behaviourmentioning

confidence: 95%

Advanced laboratory testing in research and practice: the 2nd Bishop Lecture

Jardine

2014

Geotechnical Research

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Section: Investigating Time-dependent Behaviourmentioning

confidence: 95%

Advanced laboratory testing in research and practice: the 2nd Bishop Lecture

Jardine

2014

Geotechnical Research

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“…Furthermore, it is plausible that particle crushing occurred due to the pile driving. Yang et al (2010) conducted a series of calibration chamber tests whereby model pile were jacked into Fontainebleau NE34 sand. The results show that additional fines are developed due to particle crushing.…”

Section: Pile Head Displacementmentioning

confidence: 99%

Centrifuge modelling of displacement and replacement energy piles constructed in saturated sand: a comparative study

Gunawan

Shi

et al. 2016

Géotechnique Letters

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Energy piles serve as supporting structures and heat-exchange elements. They can provide thermal comfort much more efficiently than traditional air-sourced systems as the ground offers high thermal conductivity and a stable temperature below a certain depth. Energy piles are commonly installed as bored piles (replacement); however, driven (displacement) energy piles are also used in practice. A direct comparison of the performance of these two different types of energy piles subjected to thermal cycles is rarely explored not fully understood. In this study, two centrifuge energy model piles, one wished-in-place at one gravity (i.e. at low stress, simulating bored pile) and the other pile was jacked in at elevated gravity were constructed in saturated Toyoura sand. After construction, they were subjected to five heating and cooling cycles (7-37°C) under a constant working load. Cumulative settlement with a ratcheting pattern was observed for the 'bored' energy pile after five thermal cycles. In contrast, a slight heave was recorded for the jacked-in energy pile. The observed heave can be attributed to the densification effect and particle crushing of soil when the pile was jacked in, reducing or even eliminating thermal-induced contraction of sand and hence decreasing the reduction of horizontal stress during thermal cycles.

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“…Grain fragmentation is significant for several important geotechnical problems, for instance settlement of rockfill dam shoulders (Alonso et al, 2005), side friction on driven piles (Yang et al, 2010), durability of railway ballast and so on. Numerical models of such problems might not be sufficiently accurate if grain fragmentation is ignored.…”

Section: Introductionmentioning

confidence: 99%

“…One example at the high end of crushability is given by petroleum coke (McDowell & Bolton, 1998). At the low end of crushability, simulations of tests on Fontaineblau sand (Yang et al, 2010) and silica sand (McDowell, 2002) are presented. Model validation against the experimental results is performed using the observed macroscopic stress-strain response, by checking the at-rest stress pressure coefficient and, when available, by examining the evolution of grain sizes.…”

Section: Introductionmentioning

confidence: 99%

An approach to enhance efficiency of DEM modelling of soils with crushable grains

Ciantia¹,

Arroyo²,

Calvetti³

et al. 2015

Géotechnique

176

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In this study oedometric compression tests of hydrocarbon coke, Fontainebleau sand and silica sand are simulated in three dimensions using breakable particles. The method adapts a rigorous breakage criterion for elasto-brittle spheres to represent failure of grains isolated between platens or within granular masses. The breakage criterion allows for the effect of particle bulk and contact properties to be treated separately. A discrete fragmentation multigenerational approach is applied as a spawning procedure. The number of particles quickly increases during the simulation, but is kept manageable by systematic fine exclusion and upscaling. Fine exclusion leads to mass losses between generations, but that loss is accounted for outside the mechanical model. Sensitivity analysis shows that it is enough to keep 53% of the crushed particle mass within the mechanical model to correctly reproduce experimental macroscopic behaviour. Practical upscaling rules are proposed for (a) contact stiffness, (b) breakage criteria and (c) grain size distribution, and validated simulating the same test, reducing by half the initial number of particles. The results are promising as both the mechanical and grading evolution are well captured with two orders of magnitude savings in computing efficiency.

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Sand grain crushing and interface shearing during displacement pile installation in sand

Cited by 179 publications

References 19 publications

Advanced laboratory testing in research and practice: the 2nd Bishop Lecture

Advanced laboratory testing in research and practice: the 2nd Bishop Lecture

Centrifuge modelling of displacement and replacement energy piles constructed in saturated sand: a comparative study

An approach to enhance efficiency of DEM modelling of soils with crushable grains

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