成昆铁路复线吉新隧道顺利贯通.pdf

现 代 隧 道 技 术
季冻区隧道离壁式波纹钢板保温套衬及其保温效果研究
MODERN Education, Southwest Jiaotong University, Chengdu 610031)
: In order to prevent and control frozen damage that frequently occurs in tunnels in the seasonably frozen re⁃
Abstract
gion, a new thermal insulation liner composed of off-wall corrugated steel plates is developed, which is characterized
by easy construction, reliable waterproof performance, resistance to concrete chipping, an increase in the service life
of polyurethane and so on. Numerical simulation is performed to study the temperature field of the tunnels installed
with thermal insulation liner composed of off-wall corrugated steel plates in the seasonably frozen region and its
thermal insulation effect. The results show that the installation of the new thermal insulation liner composed of off-
wall corrugated steel plates in tunnels in the seasonably frozen region can prevent the impact of cold air on the lining
structure, the area of surrounding rocks with positive temperature is increased, and the tunnel frost line moves for⁃
ward from the surrounding rock position at m away from the lining to the thermal insulation liner, effectively
preventing the occurrence of frozen damage of tunnels in the seasonably frozen region; the thermal insulation effect