Reply to the discussion by Ni et al. on “Analysis of the internal stability of granular soils using different methods”

MoraciN.,; Ielo, Domenico

doi:10.1139/cgj-2014-0495

Cited by 13 publications

(7 citation statements)

References 11 publications

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“…The F value is evaluated as the mean value between F 1 at (H/F) min , evaluated by means of the Kenney and Lau criterion, and F 2 at (D 15 /d 85 ) max , evaluated by means of the Kezdi and the Sherard criteria. The S value is evaluated as the average between S 1 and S 2 , which are the secant slopes at F 1 and F 2 , respectively (Moraci et al, 2015). The authors would like to comment on the parameters as follows.…”

Section: 2mentioning

confidence: 99%

“…& The value of F 2 at (D 15 /d 85 ) max , evaluated by means of the Kezdi and the Sherard criteria, is difficult to determine for some soil specimens, especially for a soil specimen with a flat tail in the finer component (see Figures 5-7). The determination method for F 2 at (D 15 /d 85 ) max proposed by Moraci et al (2015) is very complex because three methods were proposed for different situations.…”

Section: 2mentioning

confidence: 99%

“…Fortunately, the butterfly wing chart was proved to be successful in distinguishing between stable and unstable soil particle distributions when the values fell in the stable and unstable zones (Moraci et al, 2014(Moraci et al, , 2015 in spite of these two issues regarding the coordinate variables. However, further research is still necessary to identify which are the more reasonable coordinate variables.…”

Section: 2mentioning

confidence: 99%

“…It is important to recognise that the potential for internal instability of granular soils is mainly controlled by the particle size distributions (PSDs), and the onset of instability is governed by the hydromechanical conditions and initiates where seepage force exceeds a critical threshold (Chang and Zhang, 2013; Dallo and Wang, 2012;Moffat and Fannin, 2006). Broadly graded soils whose PSD curves are concave upward and gap-graded soils are generally considered as potentially internally unstable soils (Moraci et al, 2014(Moraci et al, , 2015Wan and Fell, 2008). Only the potential for internal instability of granular soils will be the focus of the present study.…”

Section: Introductionmentioning

confidence: 99%

“…Although the semi-empirical criteria proposed by Kezdi (1969) and Lau (1985, 1986) were developed for coarse-grained soils with no fines content , the experiments conducted by suggested that the empirical criteria proposed by Kezdi (1969) and Lau (1985, 1986) were valid not only for coarsegrained soils but also for sands and gravels with a component of non-plastic silt. Moraci et al (2014Moraci et al ( , 2015 evaluated the reliability of the semi-empirical criteria by means of theoretical and experimental approaches, and the theoretical results indicate that the Kenney and Lau criterion is more reliable; that is, the theoretical results obtained from the Kenney and Lau criterion are in good agreement with the experimental results, whereas some of the theoretical results obtained from the Kezdi criterion and the Sherard criterion are inconsistent with the experimental results.…”

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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Section: 2mentioning

confidence: 99%

Section: 2mentioning

confidence: 99%

Section: 2mentioning

confidence: 99%