The damages of railway tunnels in cold regions caused
by freezing not only jeopardize the stability of the tunnel structures, but
also bring huge potential safety hazards to the safe operation of the railways.
The freezinginduced damage has always been a challenge and a hot research topic
for tunnels in cold regions. The engineering community urgently needs reliable
and efficient engineering technical measures in aspect of frostproofing and antifreezing. In this paper,
the railway tunnels under construction or in operation in cold regions in China
are investigated, and the common freezinginduced
damages of tunnels, including the cracking and spalling of the lining, the
icicles on the tunnel crown, the ice accumulation in the track bed, and the
freezing of the drainage system, are summarized and analyzed; then, in view of
the three technical difficulties including the lack of the prediction method
for the spatiotemporal distribution of the temperature fields of the tunnels,
the unclear mechanism and evolution of the freezinginduced
damages of the tunnels, and the immature design method and treatment technology
for frostproofing and antifreezing,
the research results obtained so far are summarized and discussed. The relevant
achievements are as follows: (1) The indoor experimental system for tunnels in
cold regions is developed; the spatiotemporal distribution pattern of the
temperature fields is obtained on the basis of the extensive temperature field
data measured; the temperature field prediction method is established. (2) The
seepage experiment equipment is developed, the chaintype
mechanism of the freezinginduced damage is unveiled,
and the freezing pattern and the freezingthawing
response mechanism of the drainage system are identified. (3) The design
standard for the frostproofing and antifreezing of the railway tunnels in cold regions is established, and
a comprehensive prevention and control system for the freezinginduced damages of tunnels is formed. Finally, the development
direction of further researches on the frostproofing
and antifreezing of the railway tunnels in cold
regions is prospected, including the frostproofing and
thermalinsulating materials, the active thermalinsulation system, and the temperature field prediction.
TIAN Siming
,
WANG Wei
,
LIU Jianyou
,
XU Tianyuan
,
ZHANG Kuangsan
,
SUN Keguo
. Research on and Prospect of Key Technologies of Frost-proofing
and- Anti-freezing for Railway
Tunnels in Cold Regions[J]. Tunnel Construction, 2024
, 44(1)
: 21
-34
.
DOI: 10.3973/j.issn.2096-4498.2024.01.002
