季节性冻土区运营隧道围岩温度场数值模拟分析

A Numerical Simulation of the Temperature Filed of the Surrounding Rock of an Operation Tunnel in Seasonally-Frozen Regions

季节性冻土的冻融变化是隧道产生冻害的主要原因,隧道温度场分布规律研究是季节性冻土区隧道冻害研究的技术基础。以运营的准池铁路杀虎口隧道为工程背景,通过建立数值模型对隧道温度场进行分析。研究结果表明：围岩温度场随外界气温的季节性变化而呈周期性变化,每年11月至来年3月份为冻结期,10月和4月为反复冻融期;每年相同时间的围岩冻结深度随年数的增加而逐渐增大,7~10年达到基本稳定期。

Tunnel frost damage usually results from the freezing and thawing change in a seasonally-frozen region. T he study ofthe distribution law of the temperature field of a tunnel is the technical basis for the study of the frost damage. With theShahukou Tunnel in operation of the Zhunchi Railway as the engineering background？ the temperature field of the surroundingrock of the tunnel is analyzed with a numerical simulation model. T he results show that the distribution of the temperature fieldof the surrounding rock of a tunnel cyclically changes with the seasonal change in the seasonal air temperature, with the freezing periodof the surrounding rock lasting from November this year to March next year,and the repeated freezing and thawing periods lasting betweenApril and October. And the depth of the frozen rock is gradually increased year by year. After 7-10 years, it tends to be stable.