scholarly journals Reply to the discussion by Dallo and Wang on “A new theoretical method to evaluate the internal stability of granular soils” 1Appears in the Canadian Geotechnical Journal, 49(7): 866–868 [doi: 10.1139/t2012-036].

2012 ◽  
Vol 49 (7) ◽  
pp. 869-874 ◽  
Author(s):  
Nicola Moraci ◽  
Maria Clorinda Mandaglio ◽  
Domenico Ielo
Keyword(s):  
Theoretical Method ◽  
Granular Soils ◽  
Internal Stability

Corrigendum: A new theoretical method to evaluate the internal stability of granular soils

2012 ◽  
Vol 49 (7) ◽  
pp. 875-875
Author(s):  
Nicola Moraci ◽  
Maria Clorinda Mandaglio ◽  
Domenico Ielo
Keyword(s):  
Theoretical Method ◽  
Granular Soils ◽  
Internal Stability

A new theoretical method to evaluate the internal stability of granular soils

2012 ◽  
Vol 49 (1) ◽  
pp. 45-58 ◽  
Author(s):  
Nicola Moraci ◽  
Maria Clorinda Mandaglio ◽  
Domenico Ielo
Keyword(s):  
Fine Particles ◽  
Filter Design ◽  
Critical Diameter ◽  
Theoretical Method ◽  
Rigid Wall ◽  
Spherical Particles ◽  
Granular Soils ◽  
Internal Stability ◽  
Granular Base ◽  
Geotextile Filter

The geotextile filter design is particularly complex when granular base soils are internally unstable. In these conditions, the design criteria available in literature are not always reliable. This paper deals with a new theoretical method developed to evaluate the internal stability of granular soils. To simulate, theoretically, the filtration process inside these soils, a set of spherical particles and different soil relative densities have been considered. The soil has been represented by means of a sequence of parallel layers, containing constrictions and particles, placed upon each other at a distance, in the direction of hydraulic flow, which is a function of the soil relative density. The movement of the fine particles through the different soil layers has been simulated by means of a mechanism that compares each particle contained in the i layer with the constrictions contained in the next i + 1 layer. The results of the numerical simulations were used to evaluate the internal stability of the analyzed granular soil and the corresponding critical diameter of suffusion, Dc. Finally, the reliability of the proposed theoretical method was evaluated by means of the results of experimental long-term filtration tests performed using a rigid-wall permeameter on different unstable granular soils.

Analysis of the internal stability of granular soils using different methods

2014 ◽  
Vol 51 (9) ◽  
pp. 1063-1072 ◽  
Author(s):  
N. Moraci ◽  
M.C. Mandaglio ◽  
D. Ielo
Keyword(s):  
Experimental Methods ◽  
Granular Soils ◽  
Internal Stability ◽  
Empirical Methods ◽  
Average Value ◽  
Key Factor ◽  
Experimental Approaches ◽  
Geotextile Filters ◽  
Semi Empirical

The knowledge of the internal stability of granular soils is a key factor in the design of granular or geotextile filters. To evaluate the internal stability of granular soils, different semi-empirical methods are generally used. Nevertheless, the results of these methods, on the same soil, can lead to different internal stability evaluations. In this paper, to evaluate the reliability of the semi-empirical methods available in literature, the internal stability of different granular soils, reconstituted by the authors and by other researchers, has been studied by means of theoretical and experimental approaches. In particular, the theoretical analysis of the internal stability was performed using the Simulfiltr method, developed recently by the authors, while the experimental evaluation of the internal stability was carried out by means of long-term filtration tests. The comparison of the internal stability analysis performed by means of semi-empirical, theoretical, and experimental methods showed that the semi-empirical methods are not always reliable. Therefore, on the base of these results, a new chart, in terms of minimum slope Smin (%) of the grain-size distribution and of average value of finer percentage F, has been proposed to evaluate the internal stability of granular soils.

Similarity of internal stability criteria for granular soils

1992 ◽  
Vol 29 (4) ◽  
pp. 711-713 ◽  
Author(s):  
Robert P. Chapuis
Keyword(s):  
Grain Size ◽  
Groundwater Flow ◽  
Distribution Curve ◽  
Fine Particles ◽  
Frost Damage ◽  
Granular Soils ◽  
Internal Stability ◽  
Stability Criteria ◽  
Mathematical Expressions ◽  
Internal Instability

Internal instability produces segregation in fine particles, modifies drainage properties, and increases pore pressures, capillary retention, and possible frost damage. Three criteria are commonly used to assess the internal instability of granular soils. It is shown here that they can take similar mathematical expressions where the secant slope of the grain-size distribution curve indicates the risk of internal instability. Key words : suffossion, groundwater flow, gradation.

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