Laboratory model tests about the sand embankment supported by piles with a cap beam

Cui, Zhen-Dong; Yuan, Qiang; Yang, Jiaqiang

doi:10.1080/17486025.2017.1372978

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…Physical modelling of piled embankments has been undertaken to observe kinematics of soil arching in twodimensional plane strain models (Hewlett & Randolph, 1988;Low et al, 1994;Hong et al, 2007;Jenck et al, 2007;Chen et al, 2008;Rui et al, 2016a;Cui et al, 2017). However, the three-dimensional behaviour of soil arching in piled embankments was not captured in these studies.…”

Section: Introductionmentioning

confidence: 99%

Kinematics of soil arching in piled embankments

et al. 2019

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The transfer of embankment stresses towards pile heads in piled embankments is attributed to the mechanism known as soil arching. Three-dimensional physical models of piled embankments were built to simulate this mechanism. The progressive settlement of subsoil beneath an embankment was modelled and paused at increments of displacements to allow synchrotron X-ray computed tomography to be performed on the models. Image correlation techniques were then applied to the reconstructed volumes to obtain evolving three-dimensional displacement and strain fields. The strain fields show localised (shear bands) and diffuse failure modes occurring above pile heads within the embankment fill. These failure surfaces are seen to progressively develop as the subsoil undergoes settlement. The displacement fields also show the formation of a plane of equal settlement developing at a height above the pile heads, known as the critical height. The critical height is dependent on the height at which the failure surfaces propagate into the embankment fill, and a method is proposed to calculate the maximum height of failure surfaces based on the observed kinematics. The full-field kinematics provide fundamental insight into the soil arching mechanism that develops within piled embankments.

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Section: Introductionmentioning

confidence: 99%

Kinematics of soil arching in piled embankments

et al. 2019

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“…Several studies have investigated the kinematics of soil arching in piled embankments in plane strain model tests, where displacements have been observed through a transparent window (Chen et al 2008;Cui et al 2017;Hewlett and Randolph 1988;Hong et al 2007;Jenck et al 2007;Low et al 1994;Rui et al 2016). Such studies essentially model multiple active trapdoors (to simulate the subsoil settlement) separated by rigid supports (to simulate pile heads).…”

Section: Model Testsmentioning

confidence: 99%

Measurement of three-dimensional displacement field in piled embankments using synchrotron X-ray tomography

et al. 2019

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The measurement of displacement fields by nondestructive imaging techniques opens up the potential to study the pre-failure mechanisms of a wide range of geotechnical problems within physical models. With the advancement of imaging technologies, it has become possible to achieve high-resolution three-dimensional computed tomography volumes of relatively large samples, which may have previously resulted in excessively long scan times or significant imaging artefacts. Imaging of small-scale model piled embankments (142 mm diameter) comprising sand was undertaken using the imaging and medical beamline at the Australian Synchrotron. The monochromatic X-ray beam produced high-resolution reconstructed volumes with a fine texture due to the size and mineralogy of the sand grains as well as the phase contrast enhancement achieved by the monochromatic X-ray beam. The reconstructed volumes were well suited to the application of digital volume correlation, which utilizes cross-correlation techniques to estimate three-dimensional full-field displacement vectors. The output provides insight into the strain localizations that develop within piled embankments and an example of how advanced imaging techniques can be utilized to study the kinematics of physical models.

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“…Several experimental, analytical and numerical investigations were conducted with different perspectives including developing analytical equations (e.g. ;Terzaghi 1943;Iglesia et al 1999;Sivakugan 2007a,b &Cui et al 2017), studying the shape of soil arching (e.g. ;Handy 1985& Iglesia et al 2014, quantifying the effect of soil type (e.g.…”

Section: Introductionmentioning

confidence: 99%

Analysis of sequential active and passive arching in granular soils

Aqoub

Mohamed

Sheehan

2018

International Journal of Geotechnical Engineering

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Arching in soils has received great attention for several decades due to its significance on the soil-underground structure-interaction. However, soil layers underneath such an underground structure might undergo cycles of swelling and shrinking resulting in the generation of alternating active and passive modes of soil-underground structure-interaction. Consequently, the stresses on the underground structure and adjoining regions of ground become complex. The state of stress on underground structures as a result of cycles of active and passive arching was neither explored nor systematically assessed. In the present study, comprehensive investigation was carried out to examine; i. the effects of direction of initial displacement to induce an initial active or passive arching, ii. the behaviour of subsequent arching, iii. the effect of magnitude of initial displacement on the formation of arching and iv. the influence of soil height on sequential active & passive arching. The experimental results showed clearly that the magnitude of displacement of the yielding region significantly affects the formation of the arch and the degree of stress redistribution. Alternating the displacement of the underground inclusion exacerbated the formation of active and passive arching leading to a substantial reduction in shear resistance and stress redistribution. It is noted that the greatest loss in shear resistance occurs from the second cycle and remains virtually the same with further cycles. Sequentially alternating displacement of the underground inclusion is found to be detrimental to the formation of full active and passive arches irrespective of the burial height.

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Laboratory model tests about the sand embankment supported by piles with a cap beam

Cited by 6 publications

References 25 publications

Kinematics of soil arching in piled embankments

Kinematics of soil arching in piled embankments

Measurement of three-dimensional displacement field in piled embankments using synchrotron X-ray tomography

Analysis of sequential active and passive arching in granular soils

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