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Krefeld, Germany

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.

Heerten G.,NAUE GmbH and Co. KG | Horlacher H.-B.,TU Dresden
WasserWirtschaft | Year: 2012

Through the arrangement of sealings in dikes the flow stress in the dike body can be reduced and thus the safety against erosion and suffosion as well the stability of dikes can be increased. The effectiveness of sealing systems in dikes depends in a strong degree on the permeability of the subsoil. As a rule, only imperfect seals at river dikes are used. There is only a part of the underground sealed to maintain the water exchange between the river and the hinterland. The effectiveness of an imperfect sealing is greater the more impermeable the underground is. With a relatively permeable underground the effectiveness of a dike sealing must be checked very carefully, as if only a small reduction of seepage flow can be achieved in the dike body. Through additional measures, such as greater embedment of the sealing or filter and drainage package at the landside toe, an improvement can be achieved. Therefore it is essential that for planning of dikes as well as for hydraulic studies reliable data on underground conditions and soil properties must be available or have to be explored in detail beforehand.

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.

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.

Heerten G.,RWTH Aachen | Heerten G.,NAUE GmbH and Co. KG | Werth K.,BBG Bauberatung Geokunststoffe GmbH and Co. KG
Proceedings of the Institution of Civil Engineers: Ground Improvement | Year: 2012

Following past flood disasters in Europe, safe and modern levee cross-sections have been implemented using geosynthetics. The use of filter nonwovens between the levee core and drainage and up-lift ballast berms at the inner levee embankment, or the arrangement of geosynthetic clay liners (bentonite mats, GCLs) at the outer levee embankment are included along with well-established alternatives in current guidelines. The efficiency of stabilisation measures with geosynthetics integrated into the levee has been investigated and the high stability of these construction methods in the case of overtopping has been documented. Erosion at the inner levee embankment and unexpected levee failures can be prevented or delayed. The likelihood that such levees will break is minimal because the earthen levee cannot be eroded. This approach to dramatically improving the safety of levees by integrating geosynthetics into the levee cross-section could significantly reduce danger and potential flood damage in many parts of the world.

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