Hydraulic conductivity and pore sizes of nonwoven filter fabrics

Mlynarek, J

doi:10.1016/0266-1144(85)90012-3

Cited by 8 publications

(7 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The internal instability of 34 soil speciments experimentally tested by Kenny and Lau (1985), Skempton and Brogan (1994), Mlynarek et al (1995), Lafleur (1999), Lafleur et al (1989), Mao (2005), Moffat (2005) and Fannin and Moffat (2006), as shown in Figures 3 and 4, were analysed in the present study. The mathematical expressions for representing soil PSDs were derived from the ASISGS computer code first and then the secant slope curves of each soil specimen were obtained using Equations 5 and 6.…”

Section: Assessment Of Internal Instability Of Soil Specimensmentioning

confidence: 99%

See 1 more Smart Citation

Criteria for assessment of internal stability of granular soil

Zhou

Ranjith²,

2017

Proceedings of the Institution of Civil Engineers - Geotechnica

View full text Add to dashboard Cite

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.

show abstract

Section: Assessment Of Internal Instability Of Soil Specimensmentioning

confidence: 99%

“…Figure 3. Particle size distributions of soil specimens experimentally tested byKenney and Lau (1985),Skempton and Brogan (1994),Mlynarek et al (1995) andLafleur (1999) …”

mentioning

confidence: 99%

Criteria for assessment of internal stability of granular soil

Zhou

Ranjith²,

2017

Proceedings of the Institution of Civil Engineers - Geotechnica

View full text Add to dashboard Cite

show abstract

“…4.1 Soil specimens with pre-fitted PSD curves In order to verify whether the five PSD models are appropriate for granular soils, 21 soil specimens experimentally tested by Kenney and Lau (1985), Skempton and Brogan (1994), Mlynarek et al (1995) and Lafleur (1999) are studied in the present study. All the PSD curves of these 21 datasets (hereafter referred to as pre-fitted PSD curves) presented in the literature were first obtained by experimental means, and then were fitted by some mathematical functions in each respective study.…”

Section: Calculation Program For Parameter Values Of Psd Modelsmentioning

confidence: 99%

Optimal model for particle size distribution of granular soil

Zhou

Ranjith²,

2016

Proceedings of the Institution of Civil Engineers - Geotechnica

View full text Add to dashboard Cite

In this study an attempt is made to develop an optimal parametric model to represent the particle size distribution (PSD) curves of granular soils based on experimental data. Four unimodal models and one bimodal model are studied to determine which model performs best. As it is very difficult to determine the model parameter values without the assistance of a computer, because of the equations’ complexity, a software package has been developed based on the Matlab platform. A database of 21 soil specimens with pre-fitted PSD curves and 13 soil specimens with a number of experimental data are studied to evaluate the performance of these models. The results indicate that most of the gap-graded soil PSD curves can be correctly represented using the Fredlund bimodal parametric (FBP) model, while all the well-graded soil PSD curves can be represented using both the FBP and Fredlund 4 parametric (F4P) models.

show abstract

“…The author immediately responds to himself that they are and will be widely used as substitutes for traditional building materials and will spearhead the development of innovative techniques appropriate only for geotextiles. After several decades, we can say that we know the methods of testing the physical properties of different geosynthetics [3,4], we can determine the criteria for their selection depending on their function in construction [5,6], and failures and bad solutions provide us with additional knowledge [7,8]. However, it is important to know how the physical properties of these materials have changed over time.…”

Section: Introductionmentioning

confidence: 99%

Small Dam Drainage with Nonwoven Geotextile after 40 Years of Exploitation

2019

View full text Add to dashboard Cite

Synthetic materials such as nonwovens, mats and membranes have been commonly used in civil engineering for many years. The changes of geotextile characteristics in time (permeability, porosity, etc.) are poorly understood. Many authors have presented the changes in the properties of synthetic materials, mainly based on laboratory tests. The studies on geotextile samples taken from working hydraulic structures are not so many. Over 40 years, the reduction in the permeability of nonwoven geotextile was about four-fold. Probably the reason for that reduction is mechanical clogging caused by fine particles which have moved from the earth dam soil to the nonwoven geotextile. Over 40 years of operations, despite the reduction in permeability of the nonwoven geotextile, the drainage worked properly. The experiment was conducted in the field and laboratory and a two-dimensional numerical model built in software package HYDRUS (two-dimensional/three-dimensional (2D/3D)) Standard was proposed. The field measurements allow calibration and validation of the numerical model. The conducted simulations showed that at a maximum water level in the reservoir equal to 3.32 m, the water supply to the drainage is higher from upstream than from downstream. Particularly, water supply from above to the drainage is absent.

show abstract

Hydraulic conductivity and pore sizes of nonwoven filter fabrics

Cited by 8 publications

References 1 publication

Criteria for assessment of internal stability of granular soil

Criteria for assessment of internal stability of granular soil

Optimal model for particle size distribution of granular soil

Small Dam Drainage with Nonwoven Geotextile after 40 Years of Exploitation

Contact Info

Product

Resources

About