Optimal model for particle size distribution of granular soil

Zhou, Zong Qing; Ranjith, P.G.; Li, Shu Cai

doi:10.1680/jgeen.15.00075

Cited by 11 publications

(9 citation statements)

References 29 publications

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“…The probability of suffosion in a soil is controlled by the particle size distributions. Soils with concave (upwards) granulometric curves could be considered potentially unstable (Zhou et al., 2015). In addition, one of the most utilized methods to determine the suffosion probability is the Kenney and Lau (1985) criterion.…”

Section: Geotechnical Analysismentioning

confidence: 99%

Assessing the dam's stability of the pond at the ‘El Bosque’ renaissance garden (Béjar, Spain)

Ayarza,

Yenes,

Sánchez‐Sánchez

et al. 2023

Near Surface Geophysics

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The renaissance botanical garden of ‘El Bosque’ in Béjar (Salamanca, Spain) presents a pond bounded by a dam in its western part. The latter is formed by two masonry walls interconnected by buttresses. Cubic spaces in between are filled with a variable grain‐size material (silty sand) that allows limited water flow. In recent years the southern part of the dam has experienced localized and random subsidence that jeopardizes the entrance to part of the garden. To regain access, a proper and reliable diagnosis of the origin, magnitude and relevance of the subsidence must be made. In this regard, we have undertaken a microgravity survey in the dam area to identify places with an anomalous distribution of the filling material in order to foresee further sinking or potential collapsing areas. The precise positioning (2 mm resolution) and accurate terrain correction needed in this kind of high‐resolution gravity surveys (points every 1.5 m) was achieved by creating a detailed Digital Terrain Model (cm resolution) with a remotely piloted aircraft. In addition, we performed three electric resistivity tomography (ERT) profiles at different levels of the garden: i) on the dam itself, ii) right on the foot of the dam and parallel to it (5 m below and ∼17m to the W), and iii) a bit farther, but also parallel to the dam (8 m below and ∼27m to the W). The ERT profiles identified high conductivity in water‐saturated areas and determined the paths that rainfall and pond's seepage water follow in the dam and its underground, formed by granites. The geophysical studies were paired with geotechnical analyses of the sunk materials. The study concluded that the thinnest fraction of the dam's filling material (i.e., silts) is being washed away, leaving behind sand with less density and stability, susceptible to collapse. Thus, the observed sinking is related to soil piping, i.e. to soil internal erosion and compaction issues that force the soil material to re‐adjust geometrically and volumetrically.This article is protected by copyright. All rights reserved

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Section: Geotechnical Analysismentioning

confidence: 99%

Assessing the dam's stability of the pond at the ‘El Bosque’ renaissance garden (Béjar, Spain)

Ayarza,

Yenes,

Sánchez‐Sánchez

et al. 2023

Near Surface Geophysics

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“…A software package named ASISGS has been developed (Zhou et al, 2015) and its program can be divided into two components: (a) a calculation program for parameter values of PSD models (PV), which is used to determine the parameter values of the PSD models, and (b) a calculation program for secant slope of PSD models (SS), which is applied to obtain the secant slope curves of soil PSD according to the three commonly used semi-empirical criteria mentioned above. The working principle of ASISGS can be summarised as follows.…”

Section: Analysis Software For Assessment Of Internal Instability Of ...mentioning

confidence: 99%

“…(a) The parameter values of PSD models are determined first and then the mathematical expression P = f(d) for representing the soil PSD curve can be obtained. More information on how to determine the parameter values of PSD models can be obtained from Zhou et al (2015). (b) The secant slope curves of each soil specimen can be calculated according to the three commonly used semi-empirical criteria and derived from its mathematical expression.…”

Section: Analysis Software For Assessment Of Internal Instability Of ...mentioning

confidence: 99%

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Criteria for assessment of internal stability of granular soil

Zhou

Ranjith²,

2017

Proceedings of the Institution of Civil Engineers - Geotechnica

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An attempt is made to assess the internal instability of granular soils based on analysis of variation of the secant slope of the soil particle size distribution (PSD) curve according to three commonly used semi-empirical criteria: the Kezdi criterion, the Sherard criterion and the Kenney and Lau criterion. A computer code ASISGS is developed to first obtain the secant slope curves of soil PSD curves and then the potential for internal instability in 34 soil specimens is analysed. Comparison with experimental results indicates that the Kenney and Lau criterion successfully distinguishes between stable and unstable soil particle distributions for a majority of soil specimens. The Kezdi and the Sherard criteria are not always reliable, however, and are barely applicable when the finer fraction is less than a specific threshold value, especially for internally stable soil specimens which would be deemed as internally unstable. The intersections of the secant slope curves and the limited slope lines demonstrate that the threshold values can be taken as 15% and 12·95% for the Kezdi criterion and the Sherard criterion, respectively. Finally, a new synthetical chart is proposed for assessing internal instability of granular soils; the results derived are in good agreement with experimental results.

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“…They provide a theoretical modification method to reduce the difference between laboratory and field tests results and obtain better predictions of the collapse depth using laboratory test results. In the final paper, Zhou et al (2016) have developed an optimal parametric model, based on experimental data, that they show can be used to represent the particle size distributions of both gap-graded and well graded granular soils.…”

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Orr¹

2016

Proceedings of the Institution of Civil Engineers - Geotechnica

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Optimal model for particle size distribution of granular soil

Cited by 11 publications

References 29 publications

Assessing the dam's stability of the pond at the ‘El Bosque’ renaissance garden (Béjar, Spain)

Assessing the dam's stability of the pond at the ‘El Bosque’ renaissance garden (Béjar, Spain)

Criteria for assessment of internal stability of granular soil

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