The calculation method of the internal and external
pressure of the vehicle passing through the long and large tunnels with the
altitude difference between the tunnel entrance and exit in the western
mountainous areas in China is of great significance. As a result, the
theoretical analysis method is used to modify the singledimensional
calculation model of the internal and external pressure of the vehicle in the
plain area to make it suitable for the tunnel with a difference in elevation
between the entrance and exit. The feasibility of the calculation method is
verified by comparing with the measured data in the train of the QinghaiTibet Railway, and the calculation method is applied to actual
design. The main conclusions are drawn as follows: (1) According to the
variation law of the atmospheric pressure with the altitude, the calculation of
the internal and external pressure of a train in an altitude difference tunnel
can be realized through adjusting the reference pressure, temperature, density
and sound speed corresponding to each time in the original calculation model.
(2) The calculation results show that the clearance area of the singletrack tunnel of a highaltitude mountain
rail transit is 19.5 m2, that of the doubletrack tunnel is 41.5 m2, and the minimum
requirement of the dynamic sealing index of the train is 2.5 s.
DU Yunchao
,
TAO Weiming
,
PAN Peng
,
ZHANG Pengkuan
,
CHEN Yanghong
. Calculation Method and Application of Internal and
External Pressure of Train in Tunnel with Elevation
Difference at Entrance and Exit in Cold and Highaltitude Area[J]. Tunnel Construction, 2020
, 40(8)
: 1192
-1196
.
DOI: 10.3973/j.issn.2096-4498.2020.08.012
