Page 339 - 360.revista de Alta Velocidad - Nº 5

Influence of Aerodynamics in Tunnels Design

In addition, to assess the passengers exposure to pressures while crossing a tunnel, measurements
were made with the inspection train. Pressure gauges were installed within the train for that
purpose.
The characteristics of the instrumented tunnels are the following:

Free Crosssection Average speed Type of
Tunnel Length (m)
(m ) (km/h)* train
2
Dehesillas 861 81 275
S-102,
Castejón 392 115 278 S-103, S-104
Bubierca 2,434 76 278 y S-120
Guadarrama 28,400 51.025 300
Table 4 Characteristic of tunnels analysed by Innovative Project

The instrumentation was set as follow:
• Sensors in the tunnel: Three control sections were installed in each tunnel, one in the centre
of the tunnel and the other two near the two portals. If the tunnel contained emergency
stop areas or interconnection galleries, the control sections were intended to be located
close to these zones.
• Air velocity, atmospheric pressure and temperature were measured. Anemometers were
placed on the sidewalks and windlasses were installed at the top of the vault. To measure
the piezoelectric pressure, sensors of pressure were used in the sidewalks at a height of a
meter and a half. The sections in which the measurements were made were 120m from the
inlet and outlet portals as well as the middle on the tunnel. In each section a speed and
pressure meters were set up.

Figure 1 Control sections included in tunnels

• Sensors in the inspection train. The piezoelectric pressure sensors were placed on the roof
of the train or installed on a metal plate in the train windows. They were placed in the
middle of the driving head, in the central train car and in the other driving head, all of them
outside.

International Congress on High-speed Rail: Technologies and Long Term Impacts - Ciudad Real (Spain) - 25th anniversary Madrid-Sevilla corridor 337