寒区隧道温度场计算模型与保温层设防数值分析研究  

The Calculation Model of Temperature Field and Numerical Analysis of Insulation Layer in Cold Region Tunnel

作　　者：宁翠萍[1,2] 杨益[1] NING Cuiping;YANG Yi(Yangling Vocational and Technical College,Yangling 712100,Shaanxi China;Key Laboratory of Structural Engineering and Earthquake Resistance,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]杨凌职业技术学院,陕西杨凌712100 [2]西安建筑科技大学结构工程与抗震重点实验室,西安710055

出　　处：《河南科学》2020年第4期620-625,共6页Henan Science

基　　金：国家自然科学基金(41172237);陕西省教育厅专项基金(11JK0947);杨凌职业技术学院自然科学研究基金(A2017009)。

摘　　要：我国大量寒区隧道冻害问题严重,对隧道结构稳定性和行车安全性造成极大威胁.对严寒地区哈尔滨天恒山隧道保温层施工前后进行温度监测,建立了考虑相变的平面瞬态温度场计算模型,并利用ANSYS有限元进行数值分析研究.计算了保温材料在三种不同工况下的设置方式,完成了热-应力耦合作用下的隧道结构变形分析.结果表明,利用瞬态温度场原理建立的ANSYS模型具有较高的精度和可靠性;在防冻措施上采取分层设置保温层的做法效果明显;隧道结构应力受到温度变化影响较大,设置10 cm厚PU聚氨酯保温层后,能够避免混凝土衬砌层开裂,有效减少冻害现象的发生.A large number of tunnels in cold regions are seriously damaged by frost,which threatens the stability of tunnel structure and driving safety.In this paper,the temperature monitoring before and after the construction of the thermal insulation layer of Tianheng mountain tunnel in Harbin is carried out.The calculation model of the plane transient temperature field considering the phase change is established,and the numerical analysis is carried out by using ANSYS finite element.The setting mode of the thermal insulation material under three different working conditions is calculated,and the deformation analysis of the tunnel structure under the thermal stress coupling is completed.The results show that the ANSYS model based on the principle of transient temperature field has high accuracy and reliability;the method of setting thermal insulation layer in layers is effective in antifreeze measures;the tunnel structure stress is greatly affected by the temperature change,after setting 10 cm thick PU polyurethane thermal insulation layer,it can avoid the cracking of concrete lining layer and effectively reduce the occurrence of frost damage.

关 键 词：寒区隧道 温度场 计算模型 保温层 数值分析 PU聚氨酯 热-应力耦合 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]