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Rocha H.C.,Cia. do Metropolitano de Sao Paulo Metro Basic civil project planning | Comulada M.,Mtc Maidl Tunnelconsultants GmbH and Co. KG | Maidl U.,Mtc Maidl Tunnelconsultants GmbH and Co. KG | Maia C.H.T.,Construtora Norberto Odebrecht
Geomechanik und Tunnelbau | Year: 2014

The Metro Network in São Paulo has five lines in service with a total length of 107 km in one of the most booming cities in South America with a population of over 11 million inhabitants. The network can still be considered to be in its early stages; the first line was only constructed in 1968 and is now being extended. Whilst the settlement-prone Tertiary soils under São Paulo and also the crystalline basement, with its different grades of weathering and fracturing and high abrasiveness, pose challenges for shield tunnelling, they actually represent optimum conditions for high performance shield tunnelling. The paper deals with the experience gained by operator Companhia do Metropolitano de São Paulo- Metrô, contractor Construtora Norberto Odebrecht and consultant Maidl Tunnelconsultants in the construction of the metro lines with mechanised shield tunnelling technology. © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


Kohler M.,OBB Infrastruktur Bau AG | Maidl U.,Mtc Maidl Tunnelconsultants GmbH and Co. KG | Scholz M.,Ingenieurburo Muller und Hereth | Wendl K.,ILF Beratende Ingenieure ZT GmbH
Geomechanik und Tunnelbau | Year: 2012

Two tunnels were driven in the Lower Inn valley in the years 2007 to 2009 using almost identical mixshields (Ø 13.03 m) under difficult geotechnical conditions. The tunnelling works were monitored and recorded permanently in real time, from which information can be gained about the system of shield machine and surrounding ground. The documentation of the ground conditions was undertaken by geologists working for the client. The continuous documentation of tunnelling included reporting on the excavated material as the drive was underway and the documentation of face conditions during compressed air interruptions. The combination of recorded machine data and the geological documentation of the tunnel drive provides an extensive data basis, whose evaluation shows the complex relationships of the various tunnelling parameters. © 2012 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


Kohler M.,Bau AG Geschaftsbereich Unterinntal | Maidl U.,Mtc Maidl Tunnelconsultants GmbH and Co. KG
Geomechanik und Tunnelbau | Year: 2011

There are currently no recognised prediction models available for the estimation of tool wear in shield tunnelling in soil. This paper describes the current state of knowledge through the interpreta-tion of the available index tests, available correlations and analo-gies to hard rock. Then follows a discussion of the essential soil properties and the process-related interactions, which can also determine tool wear in soil. © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG.


Maidl U.,mtc Maidl Tunnelconsultants GmbH and Co. KG | Kohler M.,OBB Infrastruktur AG | Schretter K.,OBB Infrastruktur AG
Geomechanik und Tunnelbau | Year: 2011

Between 2007 and 2009 the railway tunnels at Radfeld/Wiesing and Jenbach in the Lower Inn Valley were driven with two Herrenknecht TVM-V4 machines (face with slurry support, D = 13 m). The tunnelling work was monitored according to the principles of the observational method as part of the independent data control. This article describes the experience from the project (contracts H3-4 and H8) and make suggestions how the abstract requirements of the observational method can be implemented efficiently and economically. The results lead to the conclusion that mechanical tunnel drives in loose ground are predestined for the successful application of the observational method. © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co.


Maidl U.,Mtc Maidl Tunnelconsultants GmbH and Co. KG | Stascheit J.,Mtc Maidl Tunnelconsultants GmbH and Co. KG
Geomechanik und Tunnelbau | Year: 2014

The contribution gives an overview of the state-of-the-art of process controlling in mechanised tunnelling. A web-based and ubiquitous integrated database forms the backbone of PROCON II, a software for the analysis of machine data, project specifications, shift reports and geodetic information stored in a temporally and spatially correlated data structure. The software helps to build a knowledge base that is fed by experience from the present as well as all previous projects and that helps optimising safety, efficiency and performance of a mechanised tunnelling project. Along with a brief summary of the program features of PROCON II, this contribution gives three examples of how the software can be employed to gain insight into the key mechanisms of Earth Pressure Balanced (EPB) shield tunnelling and how it can help to improve the tunnelling performance. © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

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