When a high-speed train passes through a tunnel with a 25‰ single-sided slope, the internal and
external pressure wave generated by the high speed of the train couples with
atmospheric pressure changes, resulting in distinctive internal and external
pressure variations. Therefore, it is necessary to study the aerodynamic loads
and in-train pressure comfort of high-speed trains passing through steep tunnels under various atmospheric
pressures. In this study, real-train test methods are
employed to obtain internal and external pressure data of a high-speed train passing through the Xi′an Bei
station-Hanzhong station of the Xi′an-Chengdu high-speed
railway. The results demonstrate the following: (1) When a single train
descends through a 25‰ extra-long
tunnel, the external pressure variation trend is consistent with the changes in
atmospheric pressure due to decreasing tunnel altitude. (2) As the tunnel
length increases from1 541.2 m to 8 399.2 m for both uphill and downhill single-sided
slopes, the maximum internal and external pressure peaks of the train occur
closer to the tunnel exit. Additionally, the maximum internal and external
pressure peaks of the train increase linearly with the tunnel length. (3) As
tunnel length increases, the airtightness of the train′s
head and tail continuously decreases, resulting in an increase in the Δp/1 s, Δp/3 s, Δp/10 s, and Δp/60 s,
which correspondingly leads to a deteriorating in-train
pressure comfort environment. When the train passes through long, steep tunnel
groups, both the train′s airtightness performance and
in-train comfort environment worsen. (4) Compared to
the logic control of the pressure protection valve, keeping the pressure
protection valve closed throughout the journey results in smaller internal
pressure variations and maximum pressure changes at different time intervals,
thereby improving the in-train comfort environment.
DU Quan
,
DU Yingchun
,
YANG Rui
,
WEI Kang
,
WAN Youcai
,
MEI Yuangui
.
Full-Scale Test on Internal and External Pressure Wave Characteristics of High-Speed
Trains in Long, Steep Tunnels and Tunnel Group Environments
[J]. Tunnel Construction, 2024
, 44(7)
: 1454
-1464
.
DOI: 10.3973/j.issn.2096-4498.2024.07.012
