The paper demonstrates the application of a hypoplastic model in class A predictions of a NATM tunnel in an urban environment. The tunnel, excavated in a stiff clay, is 14 m wide with 6 m to 21 m of overburden thickness. The constitutive model was calibrated ...

<p>The City of BuenosAires,Argentina, is expanding it&rsquo;s metro network. Some 13 km of newtunnels have been excavated since 1998 and some 20 km are scheduled for construction in the near future. Many major improvements have been implemmented during these ...

<p>A complex rheological model has been used recently at several Austrian tunnel job sites to determine stresses in a shotcrete lining. The raw data are from displacements measurements at the lining contour. The analysis uses a material model based on a thermo-chemo-mechanical ...

<p>This paper presents an Artificial Neural Network approach for a quick displacement prediction using the results of field measurement for NATM tunnels.</p>

<p>While significant improvements have been made over the years in terms of tunnel construction in the USA, the substantial growth in passenger traffic, and the need for more efficient rapid transit systems in urban areas will involve a steady progress in ...

The Bolu Tunnels lie along Trans European Motorway (TEM) which is connecting Eastern Europe with the Middle East. The tunnels are approximately 3.0 km long, 40 m apart and have excavated cross sections more than 200 m2. In construction, New Austrian Tunneling ...

<p>A brief overview of jet grouting in Brazil is followed by &ldquo;why and when&rdquo; basics in relation to ground improvement for safe tunnel excavating. A number of case histories are reported - mostly NATM tunnels involving what were seen as difficult, ...

In the construction of a recent tunnel, we used the NATM (New Austrian Tunnelling Method) to carry out the design for the geological conditions. It is generally difficult to properly determine the geological conditions in a tunnel and as a consequence the ...

This paper describes the detailed engineering design process in terms of the relative geotechnical interpretation stage, the subsequent multistaged numerical simulation steps by using SOFISTIK software, the critical decision making points and the actual results ...

<p>Tunnelling was part of the new Tren Urbano transit system in San Juan, Puerto Rico. Four tunnels in soil were designed and constructed with shotcrete linings using the sequential excavation method (SEM), which uses some aspects of the New Austrian Tunneling ...