Abstract Affected by temperature, water, crevices and other external conditions, a freeze-thaw cycle between the lining and surrounding rock may occur for a newly built tunnel in a region with seasonally frozen soil. With the change of seasons, the freeze-thaw cycle would produce frost heaves due to constraint of the lining and surrounding rock, causing lining cracking and freezing damage. Studies of the mechanism of frost heaves and the influential factors of frost damage have been conducted for many years, with three kinds of frost heave theory and a variety of antifreeze measures proposed from the micro and macro points of view; however, the problem of frost damage to tunnels in seasonally frozen regions still continues to occur. Countermeasures against freezing disasters in cold regions are presented by summarizing frost damage and analyzing the mechanism and measures for freeze prevention both at home and abroad in terms of temperature, water and crevices.
Abstract：
Affected by temperature, water, crevices and other external conditions, a freeze-thaw cycle between the lining and surrounding rock may occur for a newly built tunnel in a region with seasonally frozen soil. With the change of seasons, the freeze-thaw cycle would produce frost heaves due to constraint of the lining and surrounding rock, causing lining cracking and freezing damage. Studies of the mechanism of frost heaves and the influential factors of frost damage have been conducted for many years, with three kinds of frost heave theory and a variety of antifreeze measures proposed from the micro and macro points of view; however, the problem of frost damage to tunnels in seasonally frozen regions still continues to occur. Countermeasures against freezing disasters in cold regions are presented by summarizing frost damage and analyzing the mechanism and measures for freeze prevention both at home and abroad in terms of temperature, water and crevices.
2018, Vol. 55 