To reveal the temporal and spatial distribution laws
of temperature in cold region tunnels, based on the Jinjiazhuang extralong
spiral tunnel, the field monitoring method is employed to investigate the
variation laws of temperature of the spiral tunnel in cold regions.
Furthermore, a threedimensional model is established
using numerical simulation to investigate the influence of inlet wind speed and
temperature on the temperature field, and the formula of the insulation layer
laying length is obtained by fitting the simulation results. The research
results reveal the following: (1) The annual average temperature of air at the
inlet and outlet of the Jinjiazhuang spiral tunnel increases as the depth into
the tunnel increases. However, the annual temperature amplitude decreases
gradually, and the annual temperature amplitude at the inlet of the tunnel
varies more than that at the outlet. (2) After tunnel penetration, the annual
average temperature and temperature amplitude of the same monitoring section
decreases and increases, respectively, under the joint action of the relative
low temperature outside the tunnel on both sides. (3) The temperature field
distribution laws of the tunnel in the straight section are the same as that of
the straight tunnel under the same conditions, and the temperature curves of
the inner and outer diameters bifurcate from the curved section, i.e., the
temperature of the outer diameter side is higher than that of the straight
tunnel, while the temperature of the inner diameter side is reversed. (4) The
larger the inlet wind speed and lower the inlet wind temperature, more
unfavorable the tunnel temperature field. According to the fitting formula, the
length of the insulation layer at the inlet of the Jinjiazhuang extralong spiral tunnel should be at least 1 239 m.
MA Yinhuai
,
LIN Ming
,
JIANG Yifan
,
ZHANG Guoxiang
,
GUO Li
,
WANG Zhijie
,
LEI Feiya
,
ZHOU Ping
. Study of Temperature Field Distribution Laws and
Thermal Insulation Layer of Jinjiazhuang ExtraLong Spiral Tunnel on YanqingChongli
Highway[J]. Tunnel Construction, 2022
, 42(11)
: 1853
-1862
.
DOI: 10.3973/j.issn.2096-4498.2022.11.004
