川西高海拔隧道洞内气温特征及抗防冻理念探讨

Temperature Characteristics and Anti-Freezing Concepts of High-Altitude Tunnels in Western Sichuan Plateau,China

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中文摘要：针对川西高海拔隧道抗防冻设计问题,对运营期公路隧道洞内气温采用实测和数值模拟等方法,对隧道洞内纵向温度特征及抗防冻设计方法进行研究.结果表明:1)川西高原较短隧道冬季洞内纵向温度呈负温贯通状态,长隧道、特长隧道的洞内纵向温度呈现出弱对称或非对称分布特征.2)冬季隧道洞口温度及洞身负温分布状态与隧道自身所处环境有关,尤其是隧道两端地形特征及高差程度.3)洞口负温段冻结指数和年冻结天数均随进洞距离的增大呈减小趋势,但单向自然风占主导的隧道下降趋势较缓.4)川西高原隧道衬砌防冻设计宜结合围岩冻胀敏感性,考虑以冻结指数180℃·d为临界值较为合理,两侧水沟保温设防长度可按月平均气温 0℃考虑;考虑到冻结指数大于 180℃·d且月平均气温低于 0℃的衬砌段落会经受短时频繁冻融循环作用的影响,建议采取必要措施改善混凝土耐久性指标,确保隧道衬砌结构的长期稳定性.

外文摘要：The authors investigate the longitudinal temperature characteristics and anti-freezing design methods for a highway tunnel in the western Sichuan plateau,China,through field temperature measurements and numerical simulations conducted during the operational period.The findings are as follows:(1)The longitudinal temperature in short tunnels in the western Sichuan plateau shows negative temperature penetration in winter,while long and extra-long tunnels exhibit weakly symmetric and asymmetric temperature distributions.(2)The temperature distribution at the tunnel portal and the occurrence of negative temperatures inside the tunnel are influenced by the surrounding environment in winter,particularly the terrain features and the height differences at both tunnel ends.(3)The freezing index and the annual number of freezing days at the tunnel portal decrease with increasing distance from the portal.This decrease is slower in tunnels where one-way natural wind prevails.(4)The antifreezing design of tunnel lining structures in the western Sichuan plateau should be based on the frost-heave sensitivity of the surrounding rock.A freezing index of 180℃·d is recommended as the critical value.The insulation length for the ditches on both sides of the tunnel can be determined by the monthly average zero-degree temperature.For lining sections with a freezing index exceeding 180℃·d and a monthly average temperature below 0℃,short-term freeze-thaw cycles frequently occur.Thus,the concrete durability index should be enhanced to ensure the long-term stability of the tunnel lining structure.

外文关键词：

high-altitude tunnellongitudinal temperature fieldanti-freezing designon-site monitoringnumerical simulationfreezing indexfreezing depth

作者：

郑波、吴剑、袁明、郑金龙、郭瑞

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作者单位：

中铁西南科学研究院有限公司,四川成都 611731

中铁投资集团有限公司,北京 100055

四川省公路规划勘察设计研究院有限公司,四川成都 610041

关键词：

高海拔隧道纵向温度场抗防冻设计现场监测数值模拟冻结指数冻结深度

基金：

四川省自然科学基金项目中国中铁股份有限公司科技开发计划项目中国国家铁路局集团有限公司科技研究开发计划项目

项目编号：

2024NSFSC01582021-重大-19N2021G057

出版年：

2024

DOI：

10.3973/j.issn.2096-4498.2024.09.006

隧道建设(中英文)

中铁隧道集团有限公司洛阳科学技术研究所

隧道建设(中英文)

CSTPCD北大核心

影响因子：0.785

ISSN：2096-4498

年,卷(期)：2024.44(9)