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Lenart S.,Slovenian National Building And Civil Engineering Institute | Klompmaker J.,BBG Bauberatung Geokunststoffe GmbH and Co. KG
10th International Conference on Geosynthetics, ICG 2014 | Year: 2014

As a result of increasing railway traffic, speed and axle loads, existing railway tracks, especially those which are built on soft ground, often show signs of distress and settlements. These have a serious influence on the safety and economy of existing railway lines. As an economic measure for the rehabilitation and/or upgrading of existing railway lines, geogrid or geocomposite products for reinforcement, filtration and separation have successfully been installed in many projects and decisive product properties for these materials have been specified by Railway Authorities. The geogrid reinforcement restrains lateral deformations of the ballast/sub-ballast through shear interaction, which reduces permanent horizontal strains and vertical stresses in the long run. The geotextile component, as separation and filtration layer, prevents mixing of the often fine subgrade (clay/silt) with the coarse aggregate, which prevents distortion of the whole track superstructure. The paper presents results from 5 years of field measurement of a rehabilitated railway section (Poljcane - Dolga Gora, Slovenia) with geogrid reinforced sub-ballast layer on soft soil. In addition to this results from 2 years of field measurement of a rehabilitated railway section (Sava, Slovenia) with geogrid reinforced ballast layer on soft soil are presented and compared to an unrein-forced section. Source

Werth K.,BBG Bauberatung Geokunststoffe GmbH and Co. KG | Heerten G.,NAUE GmbH and Co. KG
WasserWirtschaft | Year: 2012

Crest overflow or wave overtopping at dykes and levees is a critical load case, often in context with flood disasters. Dyke failures with breaching and scouring below the existing ground level could be the uncontrollable consequence. Therefore crest levels of coastal dykes as well as of levees along the rivers are maintained in adaption of freeboard design. Any increase of crest levels is mainly followed by widening of the earth structures. Alternative cross-section designs with a systematic improvement of an existing dyke contour are taken into consideration inadequately. By the use of geosynthetics the resistance of dykes and levees against crest overflow and wave overtopping can be improved significantly by taking consistent dyke contours into account. Source

Klompmaker J.,BBG Bauberatung Geokunststoffe GmbH and Co. KG | Pohlmann H.,NAUE GmbH and Co. KG
GA 2012 - 5th Asian Regional Conference on Geosynthetics: Geosynthetics for Sustainable Adaptation to Climate Change | Year: 2012

The reduction of energy consumption and emission of climate gases like CO2 is a big challenge for the global industry. Practical greenhouse gas reduction actions can help reducing the risks from a warming climate and deliver considerable economic benefits. Economic and ecological advantages of construction methods using geosynthetics are already well known. The reduction of excavation masses and truck transport in areas with soft soil conditions by using geogrid soil reinforcement technology is only one of many examples. This paper will illustrate the potential in reduction of the carbon footprint by comparing and evaluating the cumulated energy demand (CED) and the climate related CO2 emissions for the complete life cycle of the used building materials for conventional construction methods vs. geosynthetic construction alternatives in infrastructural applications. Source

To improve the mechanical performance of unbound granular layers in road constructions, geosynthetics are used for the function of, amongst others, reinforcement by geogrids. As far as the geogrids are characterized by a suitable mechanical specification, the granular layers are reinforced even at very low deformations. For verbal and technical clarification the stabilization effect is understood as part of the reinforcement function. Tenders, bids, acceptances and contracts for products shall be worked out based on technical regulations and CE-marking documents for reinforcing products with slight additions, taking low strain and serviceability limit states into consideration. In opposite to layers mixed with binders, the water permeability is not influenced by this measure, and geogrid reinforced layers can be characterized by extraordinary ductility. ©2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

Von Maubeuge K.,NAUE GmbH and Co. KG | Egloffstein T.,Czurda und Partner MbH | Vollmert L.,BBG Bauberatung Geokunststoffe GmbH and Co. KG
15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability | Year: 2015

Worldwide more and more road noise and view-blocking barriers are being built along roads, motorways and railway lines, with a core that is made from mineral waste. This waste material can be in the form of slag, ash from municipal waste incineration plants or contaminated soil from the rehabilitation of contaminated sites, residue from construction waste recycling or industrial processing residue (slag, ash, foundry sands, conditioned sludges etc.). These waste products have to meet certain environmental-chemical requirements and must be provided with a surface sealing for groundwater protection. This sealing system can be designed as a mineral sealing (compacted clay liner, CCL) or it can be made of geosynthetic material (geosynthetic clay liners GCL, geomembranes). The commonly required drainage layer can also be of gravel or crushed stone or it can comprise geosynthetic materials (geosynthetic drainage system). Many noise barriers have relatively steep slopes because there is limited space and the higher the barrier and the steeper the slope the greater the noise protection. The sealing and drainage systems therefore frequently require reinforcement in the form of geogrids to ensure slope stability. Source

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