Technical Excursions

The organizers are pleased to offer the following technical excursions for the congress participants. The cost of excursions is included in the registration fees and each participant can choose one excursion only.

To register for these excursions, please fill in a relevant section in the Registration Form.

1. Mrazovka Tunnel

Date: Thursday, May 10, 2007
Time: 09:00- 12:00

A visit to the Mrazovka and Strahovsky tunnels (both in operation), visit to the Traffic Control Centre.
The Strahov tunnel is an older tunnelled part of the City Circle Road (the inner circle) in Prague. Two double-lane tunnel tubes, which are separated by an intermediate rock pillar, are 2.0km long and their cross-section areas are 125m2 each. The tunnel was built between the year 1986 and 1997 using two traditional techniques, namely the ring method and shield tunnelling.
The Mrázovka tunnel is a newer tunnelled part of the City Circle Road. It consists of two three-lane tubes with the lengths of 2 x 1.3km and cross-section areas of 160m2, separated by an intermediate rock pillar. There are bifurcation chambers in both tunnel tubes allowing transition into single-lane plus double-lane tunnel tubes. The excavated cross-section area at the chambers amounted up to 324 and 340m2. The tunnel was built between the years 1998 and 2004 by the New Austrian Tunnelling Method.

2. Metro – Line C

A visit to another section of the Metro IVC Line Extension - under construction.
There are two stations completed in the 3.9km long IVC1 operational section; of them, the Kobylisy station is the first one-vault station built within the Prague metro system. This section was commissioned in 2004. The IVC2 section, which links to the IVC1, will extend the line by 4.6km; it will become an end of the line C, which crosses the whole Prague from the north to the south, for a longer time. This section comprises three cut-and-cover stations and running tunnels of both types – cut-and-cover and mined - at the lengths of 1252m and 2445m respectively. The work on this section has still been in progress. The metro operation should start by the end of the first half of 2008 at the latest.

3. SlivenecKY Tunnel

Date: Thursday, May 10, 2007
Time: 09:00- 12:00

Visit to the Slivenec tunnel under construction, further part of the Prague City Ring Road.
The construction of two new tunnels nearly started on the Prague City Ring Road once the assessment of the excavation of exploration galleries had been finished. The Slivenec tunnel will be built in the southern part of the ring road, on the sloping left bank of the valley common for the Vltava and Berounka Rivers, near the confluence of the rivers. The pair of the 1650m long tunnel tubes, one in the two-lane configuration, the other with three lanes, will be driven through very variable environment of Ordovician and Silurian rock interwoven with dike bodies of hard diabase. A progressive element of the excavation of the exploration gallery was the application of passing bays, for which the entire cross section of the top heading was excavated, as trial excavation cases. The New Austrian Tunnelling Method is designed for the excavation.

4. New Connection Tunnels

Visit to the New Connection Tunnels under construction, part of the Prague renewed railway net project.
The 1316m and 1365m long double-rail tunnels which are being built on the New Connection railway lines passing under Vítkov Hill will remove the negative impact of railway traffic on residents of the adjacent districts of the city. The parts of the city where the construction is located are architecturally exposed, therefore the solution to technical issues and the architectural solution had to be matched up, both in terms of visual complexes and the design of details. The tunnels, which are driven using the New Austrian Tunnelling Method, pass under the preserved building of National Monument with the great equestrian monument of Jan Žižka of Trocnov. Stringent limits of deformation of the ground surface above the mined tunnels were maintained, therefore the above-mentioned structures suffered no damage.

5. Utility tunnels

Visit to utility tunnels under the Prague Centre, both under construction and in operation.
The construction of driven utility tunnels in the central part of Prague started as long ago as 1975 by building the “Žižkov Utility Tunnel”. The length of the routes of the currently operated extensive network of utility tunnels exceeds 90km. Of this length, nearly 18km are currently operated, other utility tunnels are under construction or in advanced design phases. The remaining approximately 80% comprise subsurface reinforced concrete tunnels in new residential areas on the outskirts of the city. The Control Centre which was built as a part of the system is the only control and management centre for the system; it continually monitors the operation of the complex system in whole Prague. Final lining is being completed in the Vodičkova utility tunnel, which is being built in the very centre of the city.

6. Underground Educational Facility Josef (UEF Josef)

The Josef underground educational and research facility (UEF), is located 50 km south of Prague in a former gold exploration mine (close to the Slapy reservoir) and is operated by the Faculty of Civil Engineering - Centre of Experimental Geotechnics (CEG) of the Czech Technical University in Prague.
The total length of the main drifts and galleries is more than 9km (approximately 90 - 110m below the surface) of which, to date, the first 600m is available for educational and research activities.
The Josef UEF aims to cater for a wide range of educational and research activities and not simply for work on geotechnical projects and underground structures.
Projects funded by the EU ESF and 6th Framework Programme will commence at the Josef UEF later this year.