科研之友
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摘要
Thermal insulation is widely used to prevent frost related damages to tunnels in cold regions. By lay? ing thermal insulation materials, the heat exchange process between the tunnel structure and air flow in the tun? nel can be slowed down, and then the seasonal freeze-thaw of lining and surrounding rock mass can be dimin? ished. In engineering design, the length and thickness of thermal insulation materials in the tunnel are the two critical parameters, among which the laying thickness is relatively easy to determine. However, at present, there is no uniform standard and simple and reliable method for determining the laying length, which brings diffi? culty and uncertainty to design of thermal insulation. This paper systematically summarizes the engineering prac? tice, research progress and challenges in determining the length of insulation section of tunnel in cold regions, including the requirements of existing railway and highway specifications, empirical formulas, engineering anal? ogy, theoretical analysis, numerical simulation and so on. Based on the summary, some key issues that still need attention in future engineering practice and research was proposed. These issues include the selection of me? teorological data for thermal insulation design, the basis for determining thermal insulation length, the differ? ence between tunnel entrance and exit, and the difference between tunnels in seasonally frozen ground and per? mafrost regions. It is hoped that this review can provide a reference for future in-depth study and engineering de? sign of thermal insulation of tunnels in cold regions.
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单位冻土工程国家重点实验室; 中国科学院大学
