... is properly cited. filters permeability statistical analysis Permeability is a key factor to consider when assessing the durability and service quality of road pavement structures (e.g. Thom, 2014). This note presents some results of constant-head permeability testing on 30 aggregate mixtures...

... of constrictions in granular filters: (a) the constriction size distribution (CSD) and (b) the constriction density per unit volume. The results demonstrate the importance of the particle size distribution (PSD) and void ratio of the granular material in determining the constriction density...

... the proposed model. As Fig. 2 shows, the test material consisted of a mixture of commercially available crushed basaltic rock and sand that is commonly used for dam filters and railway sub-ballast (Trani & Indraratna, 2010a). The soils for testing were selected based on a two-fold rationale...

... zone. In the CFET, the specimen additionally includes a downstream filter. Three upstream materials with non-plastic fines, a core and a filter are examined. The results of nine FLETs and nine CFETs are presented and analysed. The FLETs show the clear influence of the compaction water content, fines...

...T. Shire; C. O'Sullivan The retention capability of granular filters is controlled by the narrow constrictions connecting the voids within the filter. The theoretical justification for empirical filter rules used in practice includes consideration of an idealised soil fabric in which constrictions...

... in zones of high seismic activity, as a redundant element, should a crack develop in the core and the downstream filter fail to retain the eroded particles. Uniform soils of fine-sand size are highly effective at filling cracks and stopping the progression of erosion; however, they can be significantly...

... understanding of these mechanisms can inform the filter design and specification process and reduce the hazard that internal erosion is known to pose to many engineered embankment structures. Engineers have long acknowledged the importance of the grain scale interactions, but until recently, explanations...

.... embankments erosion filters seepage Under the influence of steady seepage flow, cohesionless soil may exhibit a behaviour in which grains of the finer fraction migrate through interstices of the matrix formed by its coarser fraction. The phenomenon is termed internal instability...

... and construction methods. Acceleration of the consolidation process would require a reduction in effective drainage length and this is usually achieved by placing filter drains around the sample. The purpose of the research reported in this paper is to assess if these filter drains work effectively...

... fournis dans la présente communication démontrent que la méthode proposée est en mesure de prédire k pour des sols granulaires entièrement saturés avec un C_u de 20 maximum. filters gravels laboratory tests permeability sands seepage Steady-state seepage hydraulics...

...A. H. M. Kamruzzaman; A. Haque; A. Bouazza Fig. 2. Grading of filter materials at constant C_u = 15, and various piping and permeability ratios The procedure for the cyclic filtration test is described in detail in Haque et al. (2007) . A brief description...

...E. J. G. Gustin; U. F. A. Karim; H. J. H. Brouwers 23 09 2004 02 01 2007 © 2007 Thomas Telford Ltd 2007 consolidation filters grouting laboratory tests permeability Bleeding of cement-based grouts reduces the effectiveness of compensation grouting operations...

... observed. © 2006 Thomas Telford Ltd 2006 filters gravels sands seepage Internal stability refers to the ability of the coarser fraction of a soil to prevent migration of its finer fraction as a result of seepage flow. Skempton & Brogan (1994) report findings from piping tests...

.... erosion filters permeability sands seepage waterflow In the soil mechanics literature there is an abundance of studies concerning internal stability of poorly graded soils, addressing mainly filter stability as this is an important issue for many civil engineering applications, notably...

...M. G. Gardoni; E. M. Palmeira This paper presents a study on the microstructure and pore characteristics of virgin and partially clogged non-woven geotextile filters under confinement using different experimental techniques. Geotextiles commonly found in practice were tested under normal stresses...

... be captured by the filter, but will not form voids small enough to retain the finer particles of the base soil. Continuing the example for material AP1, the maximum diameter of the stable PSD was found to be d_15coarse = 0·055 mm, when n = 68% and d_85fine = 0...

... est équivalente à la méthode de la borne supérieure en analyse limite pour un mécanisme rotationnel en spirale logarithmique. Des valeurs numériques du coefficient de butée en présence ďécoulement sont présentées et discutées. © 1999 Thomas Telford Ltd 1999 earth pressure filters limit state...

...M. H. Goldsworthy © 1990 Thomas Telford Ltd 1990 dams design erosion filters residual soils Goldsworthy, M. H. (1990). GCotechnique 40, No. 2, 281-284 TECHNICAL NOTE Filter tests-direct or indirect? M. H. GOLDSwORTHY* KEYWORDS: dams; design; erosion; filters; residual soils...