The Use of Miniature Soil Stress Measuring Cells in Laboratory Applications Involving Stress Reversals

Zhu, Bitang; Jardine, Richard J.; Foray, Pierre

doi:10.3208/sandf.49.675

Cited by 48 publications

(16 citation statements)

References 16 publications

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“…The loading calibration coefficient was determined by fitting a linear formula to the measurements in the loading test. However, the unloading curves show hysteresis similar to that reported by Zhu et al (2009) andTalesnick (2005). Zhu et al (2009) normalized the unloading data and suggested double exponential functions for the normalized data.…”

Section: Calibrations Of the Pressure Cellssupporting

confidence: 76%

“…However, the unloading curves show hysteresis similar to that reported by Zhu et al (2009) andTalesnick (2005). Zhu et al (2009) normalized the unloading data and suggested double exponential functions for the normalized data. For the present paper, a single exponential function was adopted to fit the normalized data to the unloading calibration tests results:…”

Section: Calibrations Of the Pressure Cellssupporting

confidence: 76%

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Investigation of Soil-Arching Development in Dense Sand by 2D Model Tests

Tol²,

et al. 2016

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A trapdoor system has frequently been used to study soil arching and its development in recent years. The load transfer in the fill of piled embankments is very similar to a trapdoor system with multiple trapdoors. There are multiple arching models described in different standards and guidelines for piled embankments that can be subdivided into three archingmodel families. To study the soil-arching type and its development, a series of model tests with sand fills were carried out in a two-dimensional (2D) multi-trapdoor test setup. The tests considered four factors-the fill height, trapdoor width, pile width, and grain size of the sand-with four values for each factor. Triangular slip surfaces were found at very small deformations using the particle image velocimetry (PIV) technique. These surfaces evolved in ways that could be related to the three types of stress-distribution ratio curves, with development patterns similar to the arching families of piled embankments: (1) the rigidmodel family, (2) the equal-settlement-plane-model family, and (3) the limit-equilibriummodel family. The limit-equilibrium-model family occurred in tests with narrow trapdoor widths.

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Section: Calibrations Of the Pressure Cellssupporting

confidence: 76%

Section: Calibrations Of the Pressure Cellssupporting

confidence: 76%

Investigation of Soil-Arching Development in Dense Sand by 2D Model Tests

Tol²,

et al. 2016

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“…4 shows a typical plan view of a single instrument layer. Zhu et al (2009) describe full details of the disc-shaped cells, which had capacities of 500 kPa to 7 MPa and diameters of 6-6 . 5 mm, and were 0 .…”

Section: Soil Stress Sensorsmentioning

confidence: 99%

Measurement of stresses around closed-ended displacement piles in sand

Jardine

Zhu²,

Foray³

et al. 2013

Géotechnique

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Jardine, R. J. et al. Géotechnique [http://dx.doi.org/10.1680/geot.9.P.137] 1 Measurement of stresses around closed-ended displacement piles in sand R. J. JAR DINE Ã , B. T. ZHU †, P. FORAY ‡ and Z. X. YANG § Calibration chamber experiments are reported that investigate the evolution of stresses around closedended, highly instrumented, model displacement piles during simulated driving into a heavily instrumented sand mass. The soil stresses are shown to vary spatially relative to the pile tip location. As well as showing considerable radial variation, the stresses developed at any given depth build sharply as the tip approaches, and reduce rapidly as it passes. Clear differences are evident between the behaviours seen close to the shaft during alternate penetration and pause periods. Load-cycling effects are most significant close to the shaft, where the local stress paths indicate a tendency for constrained 'dilatant' behaviour, with radial stresses increasing, during loading. In contrast, markedly 'contractant' radial stress reductions are evident on unloading.

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“…Measurements were also made of z , σ σ q ¢ ¢ and r σ ¢ at two to three levels in the sand mass at radial distances between 2 and 20R from the pile axis using miniature soil sensors. Zhu et al (2009) focus on the sensors' calibrations and performance, emphasizing the care needed to address non-linear and hysteretic cell action.…”

Section: Investigating Time-dependent Behaviourmentioning

confidence: 99%