The influence of tunnel curvature on the design of the
insulation layer and the longitudinal temperature field of the Jinjiazhuang
tunnel of the YanqingChongli expressway in Hebei, China
is discussed using theoretical derivation and computational fluid dynamics
simulation methods; moreover, calculation methods for the laying length of the
insulation layer under different tunnel curvatures are proposed. The research
results show the following. (1) The curvature of the tunnel causes an
asymmetric flow of air in the tunnel, which further causes an asymmetric
convection heat transfer on the left and righthand sides of the tunnel, and an asymmetric temperature
distribution. The greater the curvature, the more serious the asymmetry. (2)
The air velocity difference in the boundary layer inside and outside the tunnel
increases with increasing curvature, and the offset effect caused by
centrifugal force appears 150 m away from the tunnel entrance and quickly
stabilizes. (3) The temperature asymmetry in the tunnel caused by the curvature
is considered in the proposed formula for calculating the length of the
insulation layer, and the formula can be used to calculate the laying length of
the insulation layer of the tunnel with various curvatures.
WANG Zhijie
,
JIANG Yifan
,
LI Jinyi
,
JIANG Xinzheng
,
ZHOU Ping
,
LEI Feiya
. Calculation Method for Laying Length of Highway Tunnel
Insulation Layer in Cold Area[J]. Tunnel Construction, 2021
, 41(2)
: 175
-184
.
DOI: 10.3973/j.issn.2096-4498.2021.02.003
