Geotechnical Risk in Rock Tunnels: Selected Papers from a by António Campos e Matos, Luís Ribeiro e Sousa, Johannes

By António Campos e Matos, Luís Ribeiro e Sousa, Johannes Kleberger, Paulo Lopes Pinto

Tunnels have a excessive measure of danger that should be assessed and controlled. Underground works intersect and engage with usual fabrics, incorporating their features as structural elements in their personal balance. consequently geotechnical danger analyses are carried out in any respect stages of tunnel development, from layout via to post-construction upkeep. research of geotechnical threat contains a gaggle of reports which bring about the id and review of the aptitude chance of mistakes and the implications of its incidence. This quantity considers building and safeguard, financing and keep an eye on, and exploration and upkeep. Eminent experts speak about probability overview and administration, dependent either on complex theoretical recommendations and on useful adventure. The e-book is of curiosity to a variety of execs fascinated by making plans, development and administration of tunnels: marketers, designers, specialists and contractors.

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Additional info for Geotechnical Risk in Rock Tunnels: Selected Papers from a Course on Geotechnical Risk in Rock Tunnels, Aveiro, Portugal, 16–17 April 2004 (Balkema: ... in Engineering, Water and Earth Sciences)

Example text

4. 4. Based on the assessed values, the potential damage in the buildings has been calculated considering the damage criteria suggested by Boscardin and Cording (1989) and by AFTES (1995). , type 3, in accordance with the Boscardin and Cording classification. After the excavation of the first station, cracks have occurred in some buildings. Reinforcement measures of some of these structures have been taken and other measures have also been adopted. The maximum settlement resulting from the excavation of the east station has been very close to the predictions done.

Iii) The shield excavation shield leads to additional losses in the NATM cavity. 1% after the passage of the shield in the other cavity. 7% can be observed. 4. 4. Based on the assessed values, the potential damage in the buildings has been calculated considering the damage criteria suggested by Boscardin and Cording (1989) and by AFTES (1995). , type 3, in accordance with the Boscardin and Cording classification. After the excavation of the first station, cracks have occurred in some buildings.

The pressure level is controlled by the effectiveness of the excavating cutter head in relation to the discharging screw conveyor. To verify complete filling of the working chamber, the density of the earth paste in the working chamber is controlled by pressure cells on the bulkhead at different levels. This method satisfies the demand of preventing a sudden instability of the face caused by a partially empty working chamber but it does not guarantee a reliable face support pressure. 5 m behind the face, provides only partial information about the support pressure at the face.

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