RUB Research School RUB Comp-Eng RUB RD SME RUB AGES SFB 837 FOR 1498 ASCE - EMI SPP 1886 EURO-C 2018
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Videos zu Vorlesungen am Lehrstuhl erneut anschauen


Es ist nun möglich Videos zu folgenden Vorlesungen erneut am Lehrstuhl anzuschauen:

- FEM in Linear Structural Mechanics
- Baustatik I
- Baustatik III

Bitte vereinbaren Sie einen Termin im Sekretariat bei Frau Schützner (svenja.schuetzner@rub.de)

 


Assessing ground interaction effects and potential damage to existing tunnels before and after excavation works
Prof. David Potts (Imperial College London)

Prof. David Potts form the Imperial College London, UK, will hold a guest lecture in the framework of SFB 837 about 'Assessing ground interaction effects and potential damage to existing tunnels before and after excavation works'.

A major research project investigating the effect of tunnelling on existing tunnels has been completed at Imperial College London. This subject is always of great concern during the planning and execution of underground tunnelling works in the urban environment. The new Crossrail transport line under construction in London passes beneath numerous tunnels, including a number of those forming part of the London Underground network. The opportunity was taken to observe the response of the Central Line tunnels during the construction of the new Crossrail tunnels in central London. Extensive instrumentation was installed within one of the tunnels and in the ground around it. In order to assess the influence of the existing tunnels on ground movements field monitoring was undertaken in Hyde Park to establish the greenfield conditions. The monitoring adopted comprised a combination of conventional techniques, such as precise levelling and taping, and state-of-the-art instrumentation such as optical fibre and MEMs technology. In addition to the field work, advanced numerical analyses were performed to model the complex ground-structure interaction at Hyde Park using sophisticated constitutive models. Excellent agreement was achieved with the field data. Another component of the research project was to examine how the stresses develop within a cast iron segmental lining as it deforms. A half-scale cast iron model was tested in the laboratory, varying factors such as bolt force and the radial load applied to the extrados. A further theme of the research was to carry out a series of advanced soil tests on high quality samples taken during installation of the field instruments. Parameters obtained from these tests allow the input data for the numerical analyses to be refined. This presentation summarises some of the main aspects of the research project and some of the primary findings.

Am: 16.03.2018
Um: 14:00
Ort: IC 03-604

see PDF file for more information

 


Rock mechanical investigations of Opalinus Clay shale in the new TBM-excavated Belchen highway tunnel (Switzerland)
Dr. Martin Ziegler (ETH Zurich)

Dr. Martin Ziegler form the ETH Zurich, will hold a guest lecture in the framework of SFB 837 about 'Rock mechanical investigations of Opalinus Clay shale in the new TBM-excavated Belchen highway tunnel (Switzerland)'.

The Swiss high-level nuclear waste repository concept requires access and ventilation tunnels or shafts, repository drifts, and underground laboratory space. The great length of repository drifts and tunnels at repository depth on the order of 24 km, together with the constraint to limit the damage of the geological barrier, among other factors, may suggest the use of tunnel-boring machines (TBMs). The new 3.2 km long Belchen N2 highway tunnel tube (Sanierungstunnel Belchen, STB) between Basel and Egerkingen, Switzerland, crosses the folded Jura mountains including about 570 m of Opalinus Clay shale (OPA), i.e., the designated target rock formation for the future deep nuclear waste repository.
The new Belchen tunnel is being constructed with enormous technical effort, because the old tunnel tubes have been damaged by swelling processes in long sections with Gipskeuper and OPA. The new tunnel offers the great opportunity to study fundamental and practical aspects of TBM excavation in OPA. Our project′s focus is on the rock mass behaviour of OPA during TBM tunnelling (short-term) and after tunnel completion (long-term). Investigations include structural geology, rock mechanical and mineralogical properties of the OPA in the Belchen area, fault hydrogeology, rock mass deformations, in-situ and laboratory OPA swelling behaviour, and short- and long-term changes and interactions (e.g., radial pressure changes) of the rock mass with the tunnel support, i.e., precast, outer steel-reinforced concrete tubbing rings and inner, cast-in-place concrete lining. In-situ monitoring systems were installed in a section where the tunnel has its maximum overburden of about 325 m, close to a cross-passage.

Am: 16.02.2018
Um: 14:00
Ort: IC 03/604

see PDF file for more information