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The Power of One
This year, Oregon-based BTL moved into a cavernous new facility--one that can finally meet its project demands. This is the second facility expansion move for BTL in only a few years. One project that underscores the advantages of the new headquarters is the 105,000 sq. ft. single-panel of 20-mil geomembrane that the company fabricated for a pond liner project in Wisconsin. Read the case study here.
ID: 3669
Publication: geosynthetica.net
Publisher: geosynthetica.net
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Author: Chris Kelsey
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Foreword
A foreward to volume 15, issue 6 from Richard J. Bathurst.
ID: 3660
Publication: Geosynthetics International
Vol: 15
Issue: 6
Pages: 383
- 383
Publisher: Thomas Telford
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Author: R.J. Bathurst
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Note of Appreciation to Paper Reviewers
ID: 3668
Publication: Geosynthetics International
Vol: 15
Issue: 6
Pages: 488
- 488
Publisher: Thomas Telford
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Author:
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A numerical study on the use of geofoam to increase the external stability of reinforced soil walls
The potential benefit of placing a panel of compressible (i.e. expanded polystyrene) geofoam behind the reinforced zone of mechanically stabilized earth (MSE) walls is investigated using a numerical modeling approach. A panel of geofoam is placed immediately behind the reinforced zone during the construction phase of an idealized plane-strain reinforced soil segmental wall model. The analysis procedure includes the modeling of soil compaction. The magnitudes and distributions of earth pressure behind the reinforced zone in the wall models with and without the geofoam panel are compared to quantify the reductions in lateral earth pressure, resultant lateral force and overturning moment expected due to the placement of the geofoam material. Predicted magnitudes of facing lateral deformation and reinforcement strains are also compared among cases studied in order to evaluate the effect of geofoam on wall serviceability. It is shown that placing geofoam behind the reinforced zone can reduce the maximum lateral earth pressure behind this zone by as much as 50% depending on the geofoam thickness and stiffness values. The magnitudes of total lateral earth force (i.e. the resultant force of the lateral earth pressure distribution) behind the reinforced mass and overturning moment about the wall toe are shown to decrease by 31% and 26%, respectively. These findings point to a significant potential for using geofoam to reduce the lateral earth pressure demand on MSE walls (i.e. as opposed to rigid retaining walls examined previously) and thereby increase their serviceability and their factors of safety against external instability.
ID: 3664
Publication: Geosynthetics
Vol: 15
Issue: 6
Pages: 452
- 470
Publisher: Thomas Telford
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Author: K. Hatami and A. F. Witthoeft
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Technical Note: Puncture resistance of PVC geomembranes using the truncated cone test
This paper presents an experimental study to develop a design procedure for the puncture behavior of polyvinyl chloride (PVC) geomembranes. The puncture resistance was measured using the truncated cone test, in which truncated cones are used as puncture points. The heights of the truncated cones are varied to determine the critical cone height, which is the height at which geomembrane puncture occurs for a given pressure. A cushion geotextile is not used in any test to enhance puncture resistance because of the large cone heights required to puncture PVC geomembranes. Critical cone heights are presented for 0.5 mm, 0.75 mm and 1.0 mm thick PVC geomembranes. The results of these tests show that as the thickness of the PVC geomembrane increases, the critical cone height increases. This indicates an increased puncture resistance with increasing geomembrane thickness. The results of the puncture tests on PVC geomembranes are compared with other types of geomembrane, e.g. smooth and textured 1.5 mm thick high-density polyethylene and 1.0 mm thick linear low-density polyethylene. This comparison shows that the puncture resistance of PVC geomembranes used in this investigation exceeds that of polyethylene geomembranes, even though the PVC geomembranes are thinner.
ID: 3666
Publication: Geosynthetics International
Vol: 15
Issue: 6
Pages: 480
- 486
Publisher: Thomas Telford
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Author: T. D. Stark, T. R. Boerman and C. J. Connor
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Geotextile containment for hydraulic and environmental engineering
Historically, geotextile containment has been used to encapsulate sandy soils to permit their use as flexible, erosion-resistant, mass-gravity structures in hydraulic and marine applications. More recently, geotextile containment has been used as a means of disposing of, and dewatering, various waste streams and contaminated sediments. The paper reviews the three main geotextile containment units in use – geotextile tubes, geotextile containers and geotextile bags – and analyses their use in a wide range of hydraulic and environmental applications. Special attention is given to the use of geotextile containment for the isolation, dewatering, and disposal of specific waste streams and contaminated sediments. Note: This paper is an updated version of the Giroud Lecture presented by C. R. Lawson at the 8th International Conference on Geosynthetics held in Yokohama, Japan, in 2006.
ID: 3661
Publication: Geosynthetics International
Vol: 15
Issue: 6
Pages: 384
- 427
Publisher: Thomas Telford
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Author: C.R. Lawson
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Interaction characteristics of geosynthetics with fine tailings in pullout test
New mining technologies not only exploit lower-grade ores but also produce a much higher volume of tailings as mining waste. The disposal of these tailings is a challenge for mine operators. A tailings dam is usually constructed to store these wastes safely. The dam continuously increases its height and changes geometry with the disposal of tailings, which is different from conventional dams. Therefore the stability of tailings dams is a challenge. Geosynthetics have been widely used as reinforcement in retaining walls and embankments, but their applicability to the construction of tailings dams has not previously been studied. Their applicability depends largely on the interaction between geosynthetics and fine tailings. In this paper, the interaction of geosynthetics (geobelt and geogrid) with fine copper ore tailings is studied through laboratory pullout tests. The test results reveal that the interaction characteristics are influenced by tailings particle size, density, moisture content, and vertical load. It is found that the maximum friction coefficient between geosynthetics and the fine tailings is less than 0.22, which is lower than the published data for natural soils.
ID: 3662
Publication: Geosynthetics International
Vol: 15
Issue: 6
Pages: 428
- 436
Publisher: Thomas Telford
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Author: G. Yin, Z. Wei, J. G. Wang, L. Wan and L. Shen
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