عنوان انگلیسی مقاله:
Distribution laws of freeze-thaw cycles and unsaturated concrete experiments in cold-region tunnels
ترجمه فارسی عنوان مقاله:
قوانین توزیع چرخه انجماد و ذوب و آزمایش های بتن اشباع نشده در تونل های منطقه سرد
Sciencedirect - Elsevier - Cold Regions Science and Technology, 172 (2020) 102985: doi:10:1016/j:coldregions:2019:102985
Peng Xua, Yimin Wua, Zijian Wanga,⁎, Le Huangb
Studying tunnel temperature fields could prevent frost damage. However, few studies have revealed the distribution
laws of freeze-thaw cycles in cold-region tunnels. In this study, the distribution laws of freeze-thaw
cycles in a tunnel were carried out, and the concrete deterioration induced by freeze-thaw cycling was explored.
First, in situ monitoring equipment was used to collect the temperature in the longitudinal direction of the
tunnels. A one-dimensional heat transfer model was used to analyze the temperature distribution in the circumferential
direction of the tunnels, where a function was proposed to describe both the annual and diurnal
temperature fluctuations. After that, the distribution laws of freeze-thaw cycles inside a tunnel were investigated.
Specifically, in the tunnel longitudinal direction, the number of freeze-thaw cycles decreased from
the entrance to the middle and then increased while approaching the exit, thereby exhibiting a V-shaped distribution.
In the circumferential direction, the intrados lining nearly always exhibited freeze-thaw cycles. The
number of freeze-thaw cycles and the temperature amplitude decreased rapidly with increasing depth.
Furthermore, a series of unsaturated concrete experiments were performed to explore the concrete deterioration
under different numbers of freeze-thaw cycles. The results showed that after being subjected to 100 freeze-thaw
cycles, the concrete specimens displayed visible damage, whereas the concrete compressive strength was not
affected. These findings can enrich the research of freeze-thaw cycles for cold-region tunnels and are significant
for guiding tunnel maintenance.
Keywords: Cold-region tunnels | Temperature field | Freeze-thaw cycles | Unsaturated concrete | Numerical simulation