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Witten, Germany

In order to reduce the travelling time from Munich to Berlin to app. 4 hours and to offer an ecology-minded travel connection in comparison to highway and air traffic, DB ProjektBau GmbH designs since the beginning of the 1990-years the construction and extension of the road section Nürnberg - Ebensfeld, which is part of the high-speed railway connection (VDE 8) from northern Italy to Scandinavia. The project is entitled as ABS VDE Nr. 8.1.1 and comprises an overall investment volume of 10 Billion Euros. This investment is conjointly done by the German Federation, the European Union and the Deutsche Bahn AG. In the last three years, Dr. Spang GmbH was commissioned to intensively evaluate the subsurface soil conditions along the ABS VDE Nr. 8 with a total length of app. 70 km and to prepare about 700 soil reports which especially focus on the improvement of the existing railway connection Nürnberg - Ebensfeld, the construction of two additional railtracks as well as the redesign of crossway constructions. The following paper gives an overview of the three years of geotechnical investigation and design and highlights on geotechnical challenges. As an example, the approach to determine the design water level during the construction and the operation period of the railway will be shown in the context of field investigation works. Copyright © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source


Krautblatter M.,University of Bonn | Krautblatter M.,TU Munich | Moser M.,Friedrich - Alexander - University, Erlangen - Nuremberg | Schrott L.,University of Salzburg | And 2 more authors.
Geomorphology | Year: 2012

The proportional contribution of low-, mid- and high magnitude rock slope failure orchestrates rock slope erosion and rockfall hazard in Alpine and Arctic environments. In this study, we compare sediment yield, geomorphic work and rock wall retreat of carbonate dissolution and five different magnitudes of rock slope failure in the steep Alpine Reintal trough valley. We combine a four-year rockfall collector measurement of 140Mg of fragmental rockfall, a 20th century scientific record of mid-magnitude rockfall as well as carbon-dating and a historical record of 15th to 19th century rock avalanche activity. The total rockfall sediment yield of 8.6 (±3.4)*10 3m 3year -1 is dominated by high-magnitude rock avalanches (>10 6m 3: 62%) and low-magnitude debris falls (<10m 3: 18%), while mid-magnitude boulder, block and cliff falls are less important. The magnitude signal contradicts studies on siliceous rocks where mid-magnitude rockfall dominates rock slope erosion. The geomorphic work released in the 17.3km 2 large catchment by rockfalls (123 (±47) Wkm -2, i.e. 0.38 (±0.15) mmyear -1) and solute transport (34 (±18) Wkm -2, i.e. 0.05 (±0.03) mmyear -1) exceeds previously published Alpine values by one to multiple orders of magnitude. We hypothesise that the magnitude signal of enhanced small and high magnitude rockfall is characteristic for carbonate cliffs. The elevated porosity-related susceptibility to fragmentation and persistent carbonate dissolution along potential sliding planes are likely to favour both low- and high-magnitude rock slope failures. Here we show how the magnitude signal of rock slope failure influences rock wall retreat, geomorphic work, rockfall deposition and sediment connectivity. © 2012 Elsevier B.V. Source


Schafer R.,Dr. Spang GmbH | Spang C.,Dr. Spang GmbH | Timmermann V.,Landesbetrieb Strassenbau NRW
Bautechnik | Year: 2013

For a structural support of a counter bearing of a roadway bridge across the Agger-valley, 14 permanent grouted anchors were installed at the end of the 1970s. In the course of the last bridge inspection it was found, that one of the two installed load cells measuring the anchors forces did not show any data. As a consequence, reloading measurements of the anchors were initialized in order to determine the actual forces of all anchors. The results of the measurement show, that a load transfer from the inner to the outer anchors had taken place leading to lower anchor forces in the inner area and greater anchor forces at the boundary in comparison to the calculated pre-stressing force. Accordingly, the two outer anchors are close to the ultimate limit state. The results of the reloading measurements are evaluated with reference to the global safety concept according to DIN 4125:1990 and the partial safety concept according to EC 7-1. It can be shown, that the distinguished approach of the safety factors for the loadings may be advantageous for the design of the anchors. However, the example shows, that questions remain concerning the inspection of permanent grouted anchors, which © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source


With the end of the coal industry, the focus has intensified on the associated eternity burden and the required follow-up. In addition to issues such as the use of former mining-dominated areas or the consequences of the mine water rise in the condition of many old mining shafts should be clarified. If in doubt, check whether the state of the prior art shaft corresponds or must be a subsequent backup. This is an assurance in quality and durability, as performed in the custody of younger civil engineering shafts according to the state of the art, subsequently difficult to achieve. The limited technical lifetime of the subsequent assurance in connection with eternity burden of mining shafts is a problem that needs to be particularly considered. The working circle 4.6 "abandoned mines" of the DGGT recommendations were developed for securing and safekeeping of the old mining. For NRW the "guide to the keep of days manholes" was issued by the district government of Arnsberg. According to the authors concrete and comprehensive guideline for hedging old mining shafts is required on this basis that serves the mining companies, engineering firms, government agencies and contractors as a guide. With this paper the authors provide a basis for discussion in the preparation of this Directive. © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

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